CN102486647B - Valve seat integrity test automatically - Google Patents
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- CN102486647B CN102486647B CN201110305340.1A CN201110305340A CN102486647B CN 102486647 B CN102486647 B CN 102486647B CN 201110305340 A CN201110305340 A CN 201110305340A CN 102486647 B CN102486647 B CN 102486647B
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Abstract
The present invention relates to a kind of valve seat integrity test automatically.The present invention includes the method for the valve seat integrity for testing valve.Determining that the valve member of valve seat integrity is typically valve seat and valve closing element, this valve closing element engages this valve seat, to close this valve.The example of method of testing described herein is respectively at the down periods test valve seat integrity opening period and described valve of described valve, and in all situations, it is not necessary to interrupt including the operation of the Process Control System of this valve, without separating this valve and testing valve seat integrity without relying on the analysis of user.
Description
Technical field
The present invention relates generally to include the Process Control System of valve, more particularly, to the method for the valve seat integrity automatically testing one or more valves at normal valve during operating.
Background technology
Such as chemistry, oil or during other use Process Control System generally include pipeline, regulate the flowing of the fluid by those pipelines or gas by opening or closing valve.The valve controlled by one or more process controllers coupled to one or more field apparatus via the analog and digital signal transmissions links of simulation, numeral or the combination of referred to as bus.Field apparatus can be such as valve positioner, switch and transmitter (such as, from the transmitter of information of sensor of pressure, liquid level, flow velocity and stem position).Field apparatus is positioned at process plant environment, and implements the process function such as opening or closing valve, measurement process parameters, collection diagnosis data etc..
Process controller may be located in process plant environment or is not positioned at process plant environment.They receive and represent the signal of process measurement made by field apparatus and/or other are about the information of field apparatus, and they perform controllers application.Controller application runs, the most different control modules, its (a) makes process control decisions, and (b) is based on the Infomiation Production control signal received, and (c) coordinates with the control module implemented by the processor being positioned in field apparatus.Control signal is sent to field apparatus by the control module in controller by transmissions links, thus controls the operation of process.
From field apparatus and controller information can by communication linkage for be usually located at control room or other away from the severe environment of plant position, such as operator workstation, PC, data history records, Report Builder, centralized data base etc. one or more other hardware or software equipment can use.These hardware devices run application, those application can such as enable an operator to implement the function about process, such as change the setting of process control routine, the operation of the control module in change controller or field apparatus, check the current state of process, check the alarm produced by field apparatus and controller, for the purpose of trainer and the operation of simulation process, test process controls software, keep and update configuration database etc., or test or collect the data of the arbitrary equipment about Process Control System, such as any kind of valve of Process Control System.
Valve for Process Control System generally includes the valve seat as parts and valve closing element, and it engages development to close valve closing.When these parts normal engagement, there is normal valve and close, and this valve has satisfactory valve seat integrity.Reusability in the operation of Process Control System, owing to wearing and tearing normally, corroding, corrosion etc., valve member can damage.By observing how valve member is operated together, it is possible to make the judgement of the robustness to those parts and situation.The robustness of the combination of valve member and its operation and situation can be referred to as the valve integrity of specific valve, sometimes can also be referred to as valve feature (valve signature profile).When valve seat integrity is impaired, being detected it is desired, because when valve seat integrity is impaired, valve may cut out abnormally, because creating the problem relating to whole system.Such as, when valve seat integrity is impaired, can leak.
Using high steam to produce in the case of the energy (such as, 1000psi) in process plant system, valve seat integrity breaks can cause another more specifically problem.Valve can be used to adjust for the flowing of the steam in electricity generation system.If valve has problems, such as, the parts of valve slightly weather, subsequently when higher steam pressure is by during by valve, and the parts slightly weathered may be etched the dangerous level becoming in system to uncontrolled high steam rapidly.Except occur on valve base part further destroy and for the deleterious effects of the operation of Process Control System in addition to, it also occur that economic loss.Especially, the valve with poor valve seat integrity the loss of the energy wasted can cause economic loss.Therefore, it is very important for finding out the problem relevant to valve seat integrity as quickly as possible.
It is traditionally used for checking valve test and the valve characteristic test that the test of valve seat integrity includes audio frequency.The valve test of audio frequency is designed to around valve generate sound signal as gas or the fluid flowing through valve.By traditional audible test, the frequency spectrum data of the structure-borne noise that the sound level of instruction valve and audio frequency are in good state differs markedly from from damaging the data that the valve beyond acceptable level obtains.The valve test amount of calculation of these audio frequencies is very big, and needs additional hardware, and therefore implements costly.
Traditional valve characteristic test is used for detecting valve problem, such as valve rod integrity, the valve base part of abrasion, exceedes maximum or minimum friction threshold value, torque threshold, valve seat positioning problems, valve seat erosion problem and stick-slip state.But, traditional valve characteristic test or needs interrupt process during testing, or need isolation (such as, separate) valve, to avoid process interrupt.Additionally, valve characteristic test needs user to implement test, and checks visually and understand test result.The result produced by valve characteristic test provides the figure of stem position and the relation of pressure.User typically requires the experience with valve characteristic pattern, determines when existing problems.Except needs, experienced user understands those results, when whenever valve court or moving away from seating position, is difficult to run and understand valve characteristic test.
In a word, it is traditionally used for determining that the test of valve seat integrity needs intervention and the analysis of people and/or stopped process may be needed to control operation.Especially, traditional valve characteristic test needs intervention and the analysis of people, and need or (1) interruption Process Control System implements the valve characteristic test as the part safeguarding routine, or cut-off valve and bypass valve are realized into Process Control System by (2), so that cut-off valve and bypass valve can be used for re-routing by the material of factory (such as, fluid or gas) flowing because separate valve just tested.Cut-off valve and bypass valve can also be referred to as isolating valve.
In situation (1), the larger amount of volume of production of process plant possible loss.In situation (2), first factory owner must invest larger amount of resource, to realize cut-off valve and bypass valve, and invests on the required manpower for operating cut-off valve and bypass valve when when the valve seat integrity test being implemented on valve.Especially, physically must be with another user coordination of management operation switch from valve to bypass valve adjacent to the user of bypass valve.According to the instruction of the user carrying out Self management, physically the user adjacent to bypass valve must manually turn on bypass valve.Switching after bypass valve completing operation, user must manually ensure and verify, whether valve is isolated with process.Be positioned at two cut-off valves at the two ends of valve to be tested by rotation, user manually ensures and verifies, whether valve is isolated with process.Separating of valve needs additional valve, additional manpower and the coordination of substantial amounts of workman and time.
Additionally, due to the loss of extra cost, volume of production and the additional manpower of needs when using traditional valve seat integrity test, so seldom testing results.Typically, within 1 year or every 5 years, valve seat integrity test is run.According to following disclosure, can more frequently produce similar test result and/or produce similar test result, and not producing the problem that described herein with traditional valve seat integrity test is associated.
Summary of the invention
The present invention include for test valve seat integrity and without interrupting the operation of Process Control System or without the method for seperating vale.Present invention additionally comprises during the normal operating that valve cuts out and/or opens, automatically test valve seat integrity.The method includes providing the Process Control System including valve, this valve operates at set point, the degree that this set point reflection valve is opened, and it is represented as full opening of percentage ratio, substantially from 0% (or being required to be less than 0% when compensation calibration biases at set point) to the scope of 100%.
In one embodiment, the method includes receiving control signal value from the controller being included in Process Control System, and it is corresponding to desired set point, and includes, according to this set point, implementing valve shutoff operation.The method determines during being additionally may included in shutoff operation that received control signal value is at or below the predetermined cutoff being associated with the valve seat integrity of valve.If this set point is at or below cutoff, then will determine that whether position data is higher than cutoff.When valve rod reaches valve seat according to set-point value response, position data represents the position of valve rod.If set-point value is higher than cutoff at or below cutoff and position data, then method is read out position data and the pressure data that the closedown with valve is associated.
In real time the pressure and the position data that read during shutoff operation can be compared with known one group of good data.Alternatively or additionally, can in real time the pressure and position data and the threshold value being associated with satisfactory valve seat integrity that read during shutoff operation be compared.For example, it is possible to be determined by the determination of the slope of mathematics tolerance or position and/or the pressure data being associated with that previously stored or known one group of good position and/or pressure data or other any are determined for whether valve has the technology of acceptable valve seat integrity to calculate threshold value.
In one embodiment, can read and store pressure and position data during shutoff operation, and pressure and position data can be compared with the one group of pressure corresponding to acceptable valve seat integrity previously stored and position data.The method can also include according to comparing operation, it is determined whether has exceeded the tolerance value being associated with satisfactory valve seat integrity, and the judgement being exceeded in response to predetermined threshold value is to generate alarm.
Continue read pressure and position data and compare pressure and position data, as long as the movement of collected position data instruction valve or valve are also not reaching to meet the steady statue of set point.
The embodiment described in priority of use previous paragraphs during valve shutoff operation.Other embodiments of valve seat Integrity Testing can be used during valve opening operation.
Opening testing example to include receiving control signal value from controller, it is corresponding to desired set point, and includes, according to this set point, implementing valve opening operation.The method also includes, according to this set point, implementing valve shutoff operation.The method determines during being additionally may included in opening operation that the control signal value received corresponding to the set point for opening operation is at or above the predetermined cutoff being associated with the valve seat integrity of valve.When set point is less than cutoff at or above cutoff and position data, reading opens, with valve, the pressure data and position data being associated.Collected pressure and position data are compared with known one group of good data.
Alternatively, can in real time pressure and position data and the tolerance value being associated with acceptable valve seat integrity collected during opening operation be compared.Such as, can there is a mathematics tolerance value, it is associated with pressure readings, position data is associated, pressure data and position data is associated or the slope of pressure and position data determines and is associated or any other is for determining whether valve has the technology of acceptable valve seat integrity and be associated.Alternatively, pressure that is that read and that stored and position data can be compared with previously stored one group of pressure and the position data corresponding to acceptable valve seat integrity.
The method can also include according to comparing operation, it is determined whether has exceeded the tolerance value being associated with acceptable valve seat integrity, and in response to having exceeded the judgement of predetermined threshold value (such as, tolerance), generates alarm.
Continue read pressure and/or position data and pressure and/or position data compared with threshold value or tolerance, as long as collected position data instruction is mobile or instruction valve is also not reaching to meet the state of set point.
Claim provides additional summary info.This summary is not the complete explanation of all of embodiment described herein.This summary is intended to the introduction to method described herein.
Accompanying drawing explanation
Fig. 1 shows the block diagram of Process Control System, this Process Control System be positioned at can during normal processing operation the process plant of control valve；
Fig. 2 is control valve and the front view of the device being associated of the Process Control System for Fig. 1, has implemented valve seat integrity test the most according to one embodiment of present invention；
Fig. 3 shows during three general stages of the example valve seat Integrity Testing according to the present invention, and how position data follows set-point value, and when the valves are closed, implements this valve seat Integrity Testing；
Fig. 4 shows during three general stages of the example valve seat Integrity Testing according to the present invention, and how position data follows set-point value, and when valve is open, implements this valve seat Integrity Testing；
Fig. 5 shows the flow chart of an example of the valve seat Integrity Testing according to the present invention, and when the valves are closed, implements this valve seat Integrity Testing；
Fig. 6 shows according to the present invention's and the flow chart of another example of the valve seat Integrity Testing of comparison position and pressure data in real time, and when the valves are closed, implements this valve seat Integrity Testing；
Fig. 7 shows the flow chart of the example implementing valve seat Integrity Testing when valve is open；
Fig. 8 shows according to the present invention's and the flow chart of another example of the valve seat Integrity Testing of comparison position and pressure data in real time, and when valve is open, implements this valve seat Integrity Testing；And
Fig. 9 shows that two figures of valve test data represent, wherein read during valve shutoff operation and/or store Part I data, and read and/or store Part II data during valve opening operation, and wherein two parts data are the examples of the data representing good valve seat integrity；And
Figure 10 shows that two figures of valve test data represent, wherein read during valve shutoff operation and/or store Part I data, and during valve opening operation, read and/or store Part II data, and it is wherein the example of the data representing poor valve seat integrity for the part data during valve shutoff operation.
Detailed description of the invention
Embodiments of the invention are described in detail below.Other embodiment be theme intrinsic, and have been assigned power and be disclosed.By following description and combine those embodiments of accompanying drawing and be apparent from for the professional person in this field.
Fig. 1 shows example process factory 10, and this factory includes different functional areas, can be each functional area offer embodiment according to the valve seat integrity testing system of the present invention.Process plant 10 includes a distributed Process Control System, and this system has one or more controller 12, and each controller is connected to one or more field apparatus 14 or 16 by input/output (I/O) equipment or card 18.Controller 12 is coupled to one or more main frame or operator workstation 20-23 also by data/address bus 25.Data base 28 is coupled to data/address bus 25, and operate as data history records, with collect and store parameter, data that state is relevant to the controller in factory 10 and field apparatus with other, and/or operate as data history records data base, the test data currently or previously of this database purchase factory 10, as downloaded from controller 12 and/or field apparatus 14 and 16 or be stored in the data in controller 12 and/or field apparatus 14 and 16.Data base 28 can also store Drawing Object, to provide the various figures of process plant 10 to represent.The embodiment of automatic valve seat Integrity Testing described here can as routine be stored in main frame or operator workstation 20-23 one or more on any one or more software application 30-33 on.Alternatively or additionally, at the memorizer 114 of the localizer 109 that the embodiment of automatic valve seat Integrity Testing described here can be stored in controller 12 (such as, software application 50) and/or Fig. 2.
Field apparatus 14 and 16 may be in harsh process plant environment, and controller 12, I/O card 18, operator workstation 20-23 may be at data base 28 that control room is interior or the most maintained or the human contact of other various process plants to relative the harshest environment in.In some cases, process plant personnel can use mobile, wireless or portable equipment to obtain the information produced by the embodiment of automatic valve seat Integrity Testing described here.
Valve seat integrity testing system described here may be integrally formed to different types of control system.Control system can be stand alone type control system or dcs.Dcs includes controlling element, and these control elements are not in middle position, and are distributed across whole system, and each subsystem is controlled by one or more distributed directors.The example of dcs as shown in Figure 1 includes valve as shown in Figure 2, a part for the subsystem that this valve operates as whole Process Control System, and wherein system controller 12 controls the valve 102 shown in Fig. 2.Such as, analog field device 14 or digital field devices 16 can represent the localizer of the valve seat integrity system shown in Fig. 2.
Alternatively, valve seat Integrity Testing described herein may be integrally formed to control system, and this can be performed by valve self completely, the such as valve seat integrity system shown in Fig. 2.Other can authorize " Fisher-Rosemount System; Inc " U.S. Patent number 6298454 of company about the additional information of the embodiment of control system and their control and diagnostic operation, entitled " diagnosis in Process Control System " is found, is incorporated as reference at this.
Fig. 2 is shown attached to the embodiment of the such as valve seat integrity testing system 100 of the pipeline 101 of the process plant of the process plant 10 shown in Fig. 1.The material 105 flowing in pipeline 101 is controlled by control valve 102, and this control valve includes valve closing element 103 and the valve seat 104 being couple to valve rod 106.Material 105 can be liquid or gas.Valve rod 106 moves up and down closing element 103 to open or close control valve 102.The power that valve actuator 102 produces, such as gas-powered, make valve open and/or close.Actuator 107 is coupled to the housing of valve 102 by yoke 108.Localizer 109, such as intelligent positioner are installed on yoke 108, and by valve movement indicator 110, such as, feedback rod, detect the movement of valve rod 106.Valve movement indicator 110 is coupled to valve position sensors 113, and this valve position sensors is coupled to valve control unit, VCU 111, and this control unit can be a processor, such as CPU (CPU).Control unit 111 receives set-point value and the control signal coming from interface 112, and this interface is coupled to control equipment, such as, the work station 20,21,22,23 of Fig. 1 or controller 12.Such as, control unit 111 can receive the set point from any controller 12 shown in Fig. 1 or control signal.Set point is the desired value that automatic control system is sent to its equipment controlled.
Alternatively, valve movement indicator 110 can be the position feedback device without connecting (linkageless), and this indicator uses and couples and/or monitor the method that valve rod 106 moves, and is the most directly connected with valve rod 106.Such as, the movement indicator that valve movement indicator 110 can be connected by electromagnetism.
As it was noted above, control unit 111 can receive the set-point value from controller 112, and then control control valve 102 according to the set-point value received.The degree that set-point value instruction valve should open or close.Control unit 111 causes the movement of valve according to the set-point value received.Control unit 111 checks and is stored in storage device 114 from the feedback information of position sensor 113 and the position data of autobiography sensor 113 in future.Localizer 10 can also include pressure transducer 115, depends on the type of actuator 107, and this sensor can be one or more pressure transducer.According to set-point value, the data that pressure transducer 115 obtains can be used as the basis of mobile valve 102 with controlled unit 111.The pressure data of sensor 115 can be stored in storage device 114.It addition, as noted before, the software application of valve Integrity Testing described here partly or entirely can be stored in storage device 114.
According to Fig. 1-2, in including the normal operating of Process Control System of valve 102, this valve works at set point, and this set point, as it was noted above, be the input of the control unit 111 of the localizer 109 in Fig. 2.The most described previously, set point defines the degree that valve is opened, and is represented as the percentage ratio of full opening of valve.Thus, set-point value 100% defines full opening of valve, and now the valve closing element 103 distance between valve seat 104 is farthest.Set-point value 0% completely closes corresponding to valve, and now closing element 103 is on valve seat 104, and the set-point value being between 0% and 100% partially opening corresponding to valve.
Depend on for the test verifying valve seat integrity it being to implement during valve shutoff operation or implement during valve opening operation, test is such as, i () is when set-point value is less than predetermined cutoff, carry out when the valves are closed, or (ii) is when set-point value is higher than predetermined cutoff, carries out when valve is open.Test and automatically carry out during the normal operating of the Process Control System including valve 102 is carried out.Perhaps, operation includes that valve cuts out or valve is opened.Respectively refer to Fig. 3,5,6 and Fig. 4,7,8, be discussed in detail below and closing and opening the test that can carry out of period.
Fig. 5 and 6 shows the embodiment of method performed when valve is according to signal at stop.Fig. 7 and 8 shows the embodiment of method performed when valve is opened according to signal.Being described in more detail, the method shown in Fig. 5,6,7,8 employs cutoff, and this cutoff is used to determine when to start automatically to accumulate position and/or pressure data.By this way, automatically collecting of data contributes to closing or open period detection valve seat integrity issue in the normal operating of process plant or the valve of Process Control System.The block of some or all of Fig. 5,6,7,8 can be carried out when the normal operating of process plant, and process plant includes being test for valve.
Fig. 3 and 4 is made that further instruction to method described here.Fig. 3 shows set-point value (SP is illustrated as O) during valve shutoff operation, the relation between position data (T is illustrated as X) and cutoff.Fig. 9 shows set-point value SP during valve opening operation, the relation between position data T and cutoff.
Fig. 3 shows three different phases of the embodiment of the valve seat Integrity Testing occurred when normal valve shutoff operation.Fig. 3 is to understand that the operating block of Fig. 5 and 6 provides additional explanation.Such as, Fig. 3 shows set point SP and the value of position data T (position data can also be referred to as " stroke " data) being relevant to cutoff (CUTOFF).In the first stage represented with (1), a stable state is opened and reached to valve, and such as, now position data is equal to set-point value.Thus, set point SP and position data T are to represent the data that valve is just being opened, and these values are bigger than cutoff CUTOFF.In the second stage represented with (2), valve opens and receives the signal for cutting out, and such as, set-point value is 0% signal opened.
In an ideal case, the signal coming from controller is only required to be 0% set-point value opened.But, under actual state, sometimes use-5% set-point value opened, because set point may need to compensate calibration deviation that may be present in valve system.In second stage (2), set point is in 0% value opened, and position data T has no chance to reach set-point value SP, and wherein position data T indicates the valve rod 106 (Fig. 2) position relative to valve seat 104 (Fig. 2).In second stage (2), position data T is bigger than cutoff.In second stage (2), can start to read position data and/or pressure data, for threshold ratio relatively.When position data T still indicates that valve rod 106 moves to close valve closing, position and/or pressure data continue to be read and with threshold ratio relatively, or after being read and storing with threshold ratio relatively.Position data and the reading of pressure data and the comparison with threshold value can continue until the phase III (3), and wherein position data instruction valve rod 106 has reached stable state position, and such as, 0% opens.
As it has been described above, in the method shown in Fig. 5, valve is according to signal at stop.Intelligent positioner 109 (Fig. 2) receives the set point coming from controller (such as, the controller 12 of Fig. 1).Localizer 109 reads set point and position data (block 500).As detailed above, set point signal indicates the percentage ratio that valve is to be opened, 0% opens (such as, close) with 0% instruction, and 100% instruction 100% is opened, and if desired, with between the two or outside all possible numerical value.It has been observed that set point may be generated for over compensation error, thus, it is possible to fall outside the scope of 0% to 100%, such as-5%.Feedback rod 110 (Fig. 2) and position sensor 113 (Fig. 2) is used to obtain position data.Position data instruction valve rod 106 (Fig. 2) is relative to the position of valve seat 104 (Fig. 2).
Localizer 109 determines that whether set point is less than predetermined value, such as cutoff (block 502).Cutoff can be such as 0.5% value opened.Such as, if when the valve is full-open, the whole span of the valve measured to closing element 103 from valve seat 104 is 6 feet, then 0.5% opens value measures the distance arrived corresponding to valve seat 104 to closing element 103, is 0.03 foot.Cutoff can be specified by user or have manufacturer to provide.
If set point is determined to be below exemplary 0.5% cutoff opened (block 502), then localizer 109 determines that whether position data is higher than cutoff (block 504).If position data is higher than cutoff, then localizer 109 uses position and pressure transducer (block 506) to read and store position data and pressure data respectively.Localizer 109 checks that valve rod 106 is the most still moving (block 508).This can be by checking that position data the most still determines in the steady state value changed or be the most not up to associated with set-point value.If as position data is still changing or moving towards set-point value indicated, valve rod 106 is still moving, then localizer 109 keeps reading and storing position and pressure data (block 506).When valve rod 106 stops mobile, localizer 109 stops collecting position and pressure data (block 510).If needing the record of additional shutoff operation, then, when localizer 109 reads and store position and pressure data, localizer 109 still can store set-point value.
Set-point value in closing test can be 0% to open, or can be from slightly below 0% value opened, until any value of slightly below cutoff (such as, opening less than 0.5% in this example).When valve is in and meets intended set point that the controller 12 from Fig. 1 receives, final desired location, valve moves stopping.During if it is determined that valve has stopped or having reached the steady state value relative to expection set-point value, localizer 109 can compare the data and model data collection or previously stored data set that current collection arrives, " good " collection (block 512) as is known, and determine more whether exceed threshold value or in the tolerance of predetermined value (block 514).
Term tolerance is used herein to represent some values near such as known " good " data set of data set of storage.Term threshold value is used herein to value of calculation or other value of calculation that expression can be obtained by known " good " collection, and this value of calculation may be used to determine when position and/or the problem of pressure data instruction valve seat integrity collected.Term threshold value is the most wide in range and includes tolerance value.
Additionally, threshold value can include the slope value determined by known " good " position previously collected and pressure data collection.After reading position and pressure data, it may be determined that instruction pressure is relative to the slope value of the change of the change of position every time.For the data of each reading, the slope value determined can compare with desired or predetermined slope value.Alternatively, position or pressure data can change reading over time, and position data may be used to determine real-time slope value relative to the change of time or pressure data relative to the change of time, this slope value can compare with desired corresponding slope value, determines whether to occur the damage damaging and when occurring valve seat integrity of valve seat integrity.Alternatively, tolerance can determined near the predetermined slope value of operation for comparing.
Exemplary known " good " data set is valve is new when or is confirmed as the data that normal operation is collected, such as, it is possible to use the characterized valve derived from the test value in a pre-installation or obtained during initial operation time tests the data collected.Manufacturer may be provided for reference characteristic valve test figure, and this figure provides " good " data set that can be used to compare.Other " good " data sets can obtain from the valve of other models, the valve that is internal or external at process plant.Further, other " good " data sets can obtain from previously stored stroke (position) data and pressure data for being just test for valve.Additionally, the data of storage can be used to produce trend data.Alternatively, the trend data of the data being produced from storage can compare with other trend datas.
Trend data may be employed to the data of modeling data collection.By using the statistical technique of the understanding of assistance data, trend can be assessed from data set.Such as, determining whether the measurement of data set shows that the trend of rising or downward trend are helpful to, those trend statistically can be told from random behavior.
If what the data collected and known " good " collected relatively exceedes threshold value, then localizer 109 can set alarm instruction (block 516), this alarm instruction can be very simple, such as the light opening and closing of local or other any visual alarms instructions near valve.Additionally or alternatively, localizer 109 can send alert message (block 516), and this can include sending communication to any this locality and/or long-range equipment.Alert message can be analog or digital message, and this analog or digital message is sent to long-range portable wireless communication apparatus, or is sent to the display at the diagnosis/maintenance work station 23 of factory 10.Test valve seat integrity when testing valve seat integrity when closing for valve next time or open valve, if as it is shown in fig. 7, compare and be not above threshold value, then method returns to start.
Exemplary tolerance value is predetermined or the value of user's setting, determines when that collected position and/or pressure data are acceptable.Tolerance can be the value selected, such as, be associated with position data and/or pressure data the 1% of data Range Representation.Such as, shown in Fig. 9, line 900 is exemplary " good " data set, and it obtains in the valve down periods with during manually carrying out characterized valve test, and in figure, along the longitudinal axis is pressure values, and positional value is along transverse axis.
The dotted line of frame 910 describes the margin of tolerance of the 1% of the drawing of the single position of line 900 and pressure data collection.Shown is to be estimated rather than ratio.Similarly, line 950 in Fig. 9 indicates exemplary " good " data set, this collection is opened period at valve and manually carries out obtaining during characterized valve test, and the dotted line of frame 920 describe the single position of line 950 and pressure data collection drawing 1% the margin of tolerance.If, such as, the position collected and pressure data collection (corresponding to block 506) are compared with " good " pressure data (corresponding to block 514 and line 900), and the data collected fall outside 1% tolerance that dotted line 910 describes, then trigger alarm (block 516).
The line 1000 of Figure 10 is that the example of the figure of the collection of the collection of position and pressure data, position and pressure data produce in valve shutoff operation.The graph data of line 1000 is determined by the attendant trained, and indicates valve to have the valve of unacceptable valve seat integrity.It is to indicate bad or unacceptable valve seat integrity that one trained attendant identifies lacking of the wedge angle when valve seat contacts with can having experience.If localizer 109 described herein reads the data of the figure (assuming that data are the chart scale sizes according to Fig. 9) of the line 1000 being similar to Figure 10, and then the data of line 1000 are compared 910 (blocks 514) by localizer 109 with tolerance value.If it exceeds tolerance value, then localizer 109 can set alarm or send alarm (block 516).
Therefore, in addition to need not make process plant off-line or put into other valves, when testing the valve seat integrity of valve, method described herein can remove the dependence of the judgement for attendant.Because localizer 109 can automatically carry out valve seat integrity test in normal processes plant operation.
Alternatively, the position produced in shutoff operation and pressure data collection, such as line 1000 and the known good collection of similar Figure 10, such as, the comparison between the line 900 of Fig. 9, may more concentrate or specify to more specifically scope of data.Such as, compare and can carry out within the scope of data relevant with the narrower position range between closing element 103 and valve seat 104.Alternatively, relatively can carry out in position data or pressure data, as only compared the position data occurred in specific pressure range, such as, the position data that pressure range is associated from 6.75 to 6.25psi only compared and there is 1% tolerance at good collection periphery, or only compare the position data being associated with other particular ranges being associated with the specific criteria of the particular type and valve of valve.
Additionally or alternatively, compare operation (block 512) to perform after reading pressure and/or position data every time.Such as, Fig. 6 shows the alternative embodiment of valve seat Integrity Testing, i.e. implements the method when carrying out valve and closing.Embodiment shown in Fig. 6 shows other optional methods comparing operation of use, and the method needs less data to store.Specifically, operability block 600,602,604,606,608 is similar to the block 500 in Fig. 5,502,504,506,506 and 516 respectively with 616.Therefore, the explanation below for method shown in Fig. 6 focuses primarily upon the difference of operation of Fig. 5 and Fig. 6.
Fig. 6 shows an alternative embodiment relative to Fig. 5, and wherein the reading of data manipulation need not cause additional data to store, and wherein compare operation more quickly carry out after digital independent.Pressure and position data can be read and with based on real-time tolerance or threshold ratio relatively, and not require the storage that longer-term limits.Such as, localizer 109 can read pressure and position data (block 606), subsequently by pressure and position data and threshold ratio relatively (block 640), and then determines more whether exceeded threshold value (block 642).
There has been described the alternative embodiment of valve seat Integrity Testing, it may be used for carrying out the method when the valve described by Fig. 4 is opened.Fig. 4 shows and opens period set-point value SP, relation between position data T and cutoff at valve.Fig. 4 shows three different phases of valve seat integrity test, to provide, when reading Fig. 7 and 8 to the description operated, the explanation added.Such as, Fig. 4 shows the set-point value SP relative to cutoff CUTOFF and position data T.In the first stage, representing with (1), valve cuts out and reaches steady statue.Now, position data is equal to set-point value, and set point SP and position data T are all 0% to open value.In second stage, representing with (2), valve cuts out and receives 0.6% set-point value opened.
In second stage (2), set-point value is 0.6% to open, and indicates valve rod 106 (Fig. 2) not have had a chance to reach set-point value SP relative to position data T of valve seat 104 (Fig. 2).In second stage (2), position data T is less than cutoff.In second stage (2), can start to read position data and/or pressure data to compare tolerance or threshold value.When position data T still indicates valve rod 106 to move to open valve, position and/or pressure data can be continuously read and with tolerance or threshold ratio relatively, or can be read and store, and then with tolerance or threshold ratio relatively.For position and/or the reading of pressure data with itself and threshold value are compared can continue until the phase III (3), wherein position data instruction valve rod 106 has reached stable state position, this stable state position is no longer less than cutoff (that is, more than or equal to cutoff).
Fig. 7 shows the embodiment of the method for the test valve seat integrity when operation left by valve.Such as, valve may be at closed position and receives the set-point value coming from system controller 12 (Fig. 1), and this set-point value instruction valve will be opened.Such as, the set point received can change to 0.6% value opened from the value (such as, closing) of 0%.If cutoff opened by valve is 0.5%, and the cutoff that the set-point value received is than 0.5% is big (such as, set-point value is 0.6%), then the intelligent positioner 109 reading set-point value (block 700) can determine whether that set-point value is higher than cutoff (block 702).
If set-point value is higher than cutoff, then localizer 109 determines that whether position data is less than cutoff (block 704).If it is, localizer 109 reads and store position and pressure data (block 706), and when position data is less than cutoff, continue to read and storage data (block 706,708).
More particularly, localizer 109 receives the desired set-point value of the system controller 12 coming from Fig. 1, and moves valve closing element 103 according to desired set-point value.Localizer 109 can have the disposal ability of oneself.In this case, localizer 109 receives and comes from the desired set-point value of controller 12 and produce oneself, and the second set-point value of local is to reach desired set-point value.The value of the second set point can be produced by control unit 111.In an alternative embodiment, localizer 109 reads the positional information from movement indicator 110, and as feedback information, positional information is sent to system controller 12.Corresponding operation is also possible in valve shutoff operation.
As described above, the expectation set-point value that desired set-point value can be the expectation set-point value that produces of (a) relatively low system-level controller (localizer 109) or (b) higher system-level controller (controller 12) produces, or both have in certain situation.No matter which kind of method, physical location all follows desired set-point value until physical location reaches the steady state value relative to desired default point value.
One example of desired default point value be 0.6% open, 50% open, 75% open or other any desired open value.Such as, when position data is also not up to cutoff, valve 102 considers to proceed opening operation.Until position data reaches to expect cutoff, localizer 109 reads and stores position and pressure data (block 706,708).After position data reaches expiration data or still changes to reach desired set-point value, localizer 109 stops collecting data (block 710) further, and one group of data of data and known " good " of opening of storage is compared (block 712) and determine more whether exceed tolerance or threshold value (block 714).Tolerance can be 1%, similar to the tolerance that aforementioned combination valve cut out test (Fig. 5) describes.If comparing outside tolerance, then localizer sets alarm instruction or sends alert message (block 716).
Fig. 8 shows that the selectable embodiment of the another kind relative to Fig. 7, the comparison (842) that wherein data (840) and tolerance or threshold value check are carried out after reading data (806) immediately.Such as the embodiment of Fig. 6, the embodiment of Fig. 8 does not requires the storage of the data of the reading added.Especially, operating block 800,802,804,806,808 and 816 is similar with the operating block 700 of Fig. 7,702,704,706,708 and 716 respectively.Therefore, explanation to the method shown in Fig. 8 is primarily upon the difference in Fig. 7 Yu Fig. 8 operation below.
Fig. 8 shows the selectable embodiment of the another kind relative to Fig. 7, and wherein the reading of data manipulation need not cause the storage of data, and wherein comparison to data is more quickly carried out after digital independent.Pressure and position data can be read and with based on real-time tolerance or threshold ratio compared with the storage limited without longer-term.Such as, localizer 109 reads pressure and positional information (block 800), by pressure and position data with one group known to good data compare (block 840), it is later determined that compare whether within tolerance (block 842).
As previously discussed, depending on whether set point is more than or less than cutoff, localizer 109 can implement any method of Fig. 5,6,7 or 8.In the optional embodiment of Fig. 5,6,7 or 8, localizer 109 can read and store different time sections or the data of any special time period.The different time sections of read operation can realize by using different cutoffs.
Alternatively, when valve opening operation, shutoff operation or when being between opening operation and shutoff operation, localizer 109 can read the most continuously and store data.Upon receipt of desired set-point value, localizer 109 can trigger and compare operation (such as block 512,712).Such as, when desired set point is higher or lower than any specific cutoff, such as 0.6% in opening operation situation, or when in closedown situation set-point value be 0% or during less than 0%, then can trigger and compare.
The modification of the method that Fig. 5,6,7,8 comprise, including by the modification of the combination in any of the block of Fig. 5,6,7 and 8, in terms of software programming or valve operating aspect is apparent to those skilled in the art.More information employing a computer to assess valve operation, see and authorize Fisher Controls International LLC, U.S. Patent number 7478012, the patent of entitled " the computerized assessment to valve feature pattern ", is incorporated as reference at this.
Another exemplary embodiment of valve seat integrity test described herein includes the valve seat integrity of the valve in automatic testing process control system, and wherein this valve includes valve seat, valve closing element.Valve closing element is closed at valve and is moved toward and away from valve seat respectively in opening operation.The method includes receiving set point from the controller of Process Control System, move valve closing element corresponding to the set point for valve towards a position, by valve closing element towards corresponding to set point position mobile period collect valve seat integrity test data automatically carry out valve seat integrity test.The method is also included the operation not interrupted Process Control System by assessment valve seat integrity test data and from Process Control System separation, valve is not carried out valve seat integrity test.The operation of Process Control System includes that a closed loop procedure controls operation, and this operation includes any other definition controlling operation corresponding to set point or closed loop procedure, and valve closing element moves towards a position.
Additionally, localizer 109 can receive set point, and collect valve seat integrity test data and assess valve seat integrity test data.Alternatively, localizer 109 receives set point, and collects valve seat integrity test data and send valve seat integrity test data and be estimated to controller 12.
Additionally, localizer 109 can receive set point, collect valve seat integrity test data and send test data to controller, I/O card, work station or other software application that is permanent or that be temporarily connected on the platform of control system, can be to send continuously or determining that valve cuts out or opening operation has reached to send after the state of assessment.When the valve seat integrity test data collected and/or set-point value reach the value that arbitrarily has preceding method to define, these values include according to Fig. 3's-10 or valve cuts out or the value of any other definition of opening operation, and valve cuts out or opening operation can reach a state to be assessed.Alternatively, localizer 109 can collect test data, and before sending data to controller 12, localizer 109 carry out to test data process, be grouped or change in one or more, in order to the communication linkage between localizer and controller can be more efficiently used.
Localizer 109 (or controller 12) is configurable to control operation (such as in all or multiple normal processes, valve cuts out or opening operation) in, by corresponding to the valve seat integrity test data collected, the one group of valve seat integrity test data relatively preset, or by determining the slope value of mathematical calculation with threshold slope value based on valve seat integrity test data collected and the slope value of mathematical calculation being compared, assess valve seat integrity test data continuously.Valve seat integrity test data include position data and/or pressure data, time data, or position data and pressure data or the combination of other arbitrary datas, as long as the combination of these data can close at valve or be observed in opening operation.
Any one in the embodiment of valve seat integrity test described here can produce alarm or send alert message to Local or Remote position.Such as, the localizer 109 of Fig. 2 can produce an alarm or send alert message to the diagnosis/maintenance application 33 of long-range Fig. 1 or controller 12.Alternatively or additionally, localizer 109 can produce alarm by the light emitting diode or change liquid crystal display screen (LCD) of lighting the housing being positioned at valve 102.
One or more valves in Process Control System can be tested by the embodiment of valve seat integrity test described herein when Process Control System holding work.As discussed earlier, embodiments of the invention can detect the problem of valve, and problem includes the abrasion of valve seat components and parts, the orientation problem of valve seat and the etching problem of valve seat.About these information and use embodiments of the invention described herein other any valve problems avoidable, see (1) and authorize Fisher-Rosemount Systems, the United States Patent (USP) of Inc company, the patent No. 6298454, Fisher-Rosemount Systems is authorized in title " diagnosis in Process Control System " and (2), the United States Patent (USP) of Inc company, the patent No. 7478012, title " the computerized assessment to valve feature pattern ", is incorporated as reference at this.
As discussed earlier, this automatic valve seat integrity test includes relative to the advantage of traditional valve characteristic test testing the work that need not stop valve, or stop using the process of valve, or seperating vale is to avoid the interference to process, or require the analysis of manual operation.User need not manually implement the embodiment of valve seat integrity test described herein, and user need not manually understand the result of the embodiment of valve seat integrity test described herein.Therefore, embodiment described herein and can preferably determine whether valve seat integrity damages and when damage.The embodiment of valve seat integrity test described herein can also preferably maintain the productivity using valve as the operation of a part and level of security.
Such as, valve can be a part for single control circulation operation, this operation can be related to a part for the operation of more complicated Process Control System by local valve positioner 109 (Fig. 2) control or valve, and this system is controlled by controller 12 (Fig. 1).To two kinds of methods, the method for automatic valve characteristic test described herein allows test to carry out in normal Engineering Control operates, and this operation relates to tested valve.Normal processes plant operation includes a kind of operation, and in this operation, in response to being configured to treat that the closed loop procedure of the control routine performed by controller controls operation, controller sends control signals to valve seat.Normal processes plant operation also includes a kind of operation, and in this operation, controller is configured to be processed as position data feedback information, and uses to the closed loop control routine being configured to be performed by controller.
Discussion below relates generally to the content shown in Fig. 1.
Each controller 12 can be any kind of process controller or the process controller of a kind of more special type, the DeltaV that such as Emerson Process Management sellsTMController, each controller 12 stores and performs to control application, and this application uses any number of control modules different, that independently execute or block 50 to realize control strategy.Each control module 50 can be made up of the thing of commonly referred to functional device, each functional device is a part or the subroutine of total control routine, and is combined operation (by being referred to as the communication that links) with other functional devices and realizes the operation of the Process Control System of process plant 10.Functional device can be the object in the agreement of OOP.Functional device can carry out output function, such as with emitter, and sensor or the relevant input function of other process parameter measurement device, and it is controlled function, such as relevant with carrying out the controls such as the control flow of PID, fuzzy logic control function.Functional device can carry out output function, and this function controls the operation of some equipment, such as valve, with some physical functions being implemented in process plant 10.The sophisticated functions block of mixing and any other type has model predictive controller (MPCs), optimizer etc..Although field bus protocol and DeltaV system protocol use design and the control module being applied in OO programming protocol and functional device, but control module can use any desired control programming scheme to design, including, such as, functional nucleotide sequence module, ladder logic etc., and be not limited to use functional device or any other separate procedure technology design and apply.Each controller 12 can also be supportedApplication combination, and prediction intelligence can be used to improve and include plant equipment, electronic system, process device, device, the ability of the production assets of on-the-spot and smart devices 14,16 and valve and performance.
Factory 10 shown in Fig. 1, field apparatus 14 and 16 is connected to controller 12, and field apparatus 14 and 16 can be the equipment of standard 4-20 milliampere, or the field apparatus of intelligence, such as HART, Process FieldbusROFIBUS or FOUNDATIONTMFieldbus field device, it includes processor and memorizer or other any desired device types.Some equipment, such as field bus device (each represent with 16 in FIG) can store and perform model, or submodel, the functional device being such as associated with the control strategy realized in controller 12.It is known that the functional device 40 being placed in two different field bus devices 16 shown in Fig. 1, can be combined with the control module 50 in controller 12 and perform to realize process control.Certainly, field apparatus 14 and 16 can be any kind of equipment, such as sensor, valve, transmitter, localizer etc..I/O equipment 18 can be any type of I/O equipment meeting desired communication or controller protocol such as HART, fieldbus, Process FieldbusROFIBUS etc..
In the process plant 10 of Fig. 1, work station 20-23 can include different application, and these application are used for carrying out various different function by the personnel in same or different factory 10.Each work station 20-23 includes that memorizer is to store different application, program, data structure etc..And processor can be used to perform storage any application in memory, such as, include the whole of valve seat integrity testing system described herein and/or method and/or any portion of routine.
Work station 20-23 includes providing the operation to the low operation level from high process control system level to single field apparatus of factory, configures, emulates, diagnoses and/or attended operation hardware and/or software.Although Fig. 1 illustrates that various relevant application 30-33 is positioned at the different work station of in these are applied, it is to be understood that according to the needs of factory 10 and setting, different application 30-33 relevant from those functions or other factory's functions may be located in the same or different work station in factory 10 or computer and be executed by.Thus, such as, although different single maintenance/diagnostic application 33 or different single control application 30 can perform on different work station 20-23 and/or controller 12, but one or more control applies 30 can perform in identical work station 20-23 with maintenance/diagnostic application 33.
In the example shown in fig. 1, work station 23 is illustrated as a diagnosis/maintenance work station, and including multiple diagnosis and/or maintenance application 33, application can be used for testing or observing the needs of whole factory 10 by different staff, and/or tests or check operation and the working condition of various equipment 12,14,16 etc..Application 33 can include supporting application 33A, such as maintenance/diagnostic application, calibration application, vibration analysis application, report generation application or other support application, such as can be used to assist personnel to carry out safeguarding/test analysis the application of diagnostic function in factory 10.Such as, maintenance/diagnostic application 33A can include valve seat integrity test application 33B.Alternatively or additionally, valve seat integrity test application 33B can realize at controller 12 whole or in part or realizes at any field apparatus 14,16 or realize at the combination of three.Valve seat integrity test application 33B can include functional device 40, control module 50, control application 30 and the combination in any of maintenance/diagnostic application 30-33.Valve seat integrity test application 33B can also be the software algorithm being completely embedded in the site processor of any valve field apparatus 14,16.
As discussed earlier, the extensively application of any system can carry out approach described herein, such as apply 30,31,32,33,33A, 33B and/or any locally applied during the storage device 114 (or the local test control unit 111 run discretely) of control unit 111 or localizer 109 can be stored in.Approach described herein by the valve seat integrity testing system of Fig. 2 or can be realized by other optional embodiments, and such as valve positioner is located away from the embodiment of the control unit of valve seat integrity testing system.
The description above is merely exemplary, the claims below limit the scope of the present invention.
Claims (40)
1., for the method testing the valve seat integrity of valve, described method includes:
The Process Control System including valve is provided；
Control signal value is received from the controller of described control procedures system；
According to the described control signal value of degree reflecting that described valve will be opened, operation is described
Valve；
According to the control signal value received, carry out valve shutoff operation；
Read described control signal value and the position data of described valve；
Determine that whether described control signal value is less than predetermined being associated with described valve seat integrity
Cutoff；
When described control signal value is determined to be below described predetermined cutoff, determine described
Whether position data is higher than described cutoff；
When described position data is confirmed as higher than described cutoff, reads and store and institute
State pressure data and described position data that valve shutoff operation is associated；
Determine whether described position data indicates the seriality of described valve shutoff operation；
When described position data indicate described valve shutoff operation seriality time, continue read and
Store the described pressure data and described position data being associated with described valve shutoff operation；
By position data that accumulate during described valve shutoff operation, that stored and pressure data
With previously stored one group of position data and pressure corresponding to acceptable valve seat globality
Data compare；
According to described comparison, it may be judged whether exceeded and the described one group of position previously stored
That data and pressure data are associated, predetermined threshold value；And
In response to the described judgement beyond described threshold value, generate alarm.
Method the most according to claim 1, it is characterised in that
Described carry out described valve shutoff operation be configured to during normal processes plant operation send out
Raw, wherein said controller is in response to being configured to the control routine that will be performed by described controller
Closed loop procedure control operation, described control signal value is sent to described valve.
Method the most according to claim 1, it is characterised in that
Described carry out described valve shutoff operation be configured to during normal processes plant operation send out
Raw, wherein said controller is configured to described position data is processed as feedback information, described
The closed loop control routine performed by described controller is used by being configured to by feedback information.
Method the most according to claim 1, it is characterised in that
Described cutoff for described valve shutoff operation is 0.5%.
Method the most according to claim 1, it is characterised in that
Described control signal value is set point.
Method the most according to claim 1, it is characterised in that
The relative position relative to valve seat of described position data instruction valve closing element.
Method the most according to claim 1, it is characterised in that
Described threshold value is by predetermined one group position corresponding with the position stored and pressure data
Put and each tolerance value determined in pressure data.
Method the most according to claim 1, it is characterised in that
Described threshold value is the slope value mathematically calculated, by with the position stored and pressure data
Each in one group of the most predetermined position and pressure data determines slope value.
Method the most according to claim 1, it is characterised in that
Continue described continuation to read and store the described pressure being associated with described valve shutoff operation
Strong data and described position data, until the position data read indicates described valve not move.
Method the most according to claim 1, it is characterised in that
Described alarm includes visual alert instruction or alert message.
11. methods according to claim 1, it is characterised in that also include:
Read and store multiple examples of described pressure and position data；
Each example for described data carries out described comparison；And
When all examples of the data being read and being stored have been included in described comparison
Time middle, complete described comparison.
12. methods according to claim 1, it is characterised in that
The described one group of data previously stored include following at least one (i) system by described valve
Make business provide one group of data or (ii) when described valve seat integrity does not damages, previously from institute
State one group of data that valve is collected.
13. methods according to claim 1, it is characterised in that
The described one group of data previously stored include based on from except described in experience test
The pressure of the valve collection beyond valve and the model data collection of position data.
14. 1 kinds are used for the method testing the valve seat integrity of valve, and described method includes:
The Process Control System including valve is provided；
Control signal value is received from the controller of described control procedures system；
According to the described control signal value of degree reflecting that described valve will be opened, operation is described
Valve；
According to the control signal value received, carry out valve shutoff operation；
Read described control signal value and the position data of described valve；
Determine that whether described control signal value is less than predetermined being associated with described valve seat integrity
Cutoff；
When described control signal value is determined to be below described predetermined cutoff, determine described
Whether position data is higher than described cutoff；
When described position data is confirmed as higher than described cutoff, reads and close with described valve
Operate the pressure data and described position data being associated；
By based on the described position data read during described valve shutoff operation and pressure data
Value compare with the threshold value corresponding to acceptable valve seat integrity；
According to described comparison, it may be judged whether reached predetermined threshold；And
In response to reaching the described judgement of described threshold value, generate alarm.
15. methods according to claim 14, it is characterised in that
Based on the described position data read during the described valve shutoff operation and pressure data
Described value is the slope value mathematically calculated, and described threshold value is according to corresponding to acceptable
The threshold slope that previously stored one group of position data of valve seat integrity and pressure data determine
Value.
16. methods according to claim 15, it is characterised in that also include:
Determine whether described position data indicates the seriality of described valve shutoff operation；And
When described position data indicates the seriality of described valve shutoff operation, continue to read and institute
State described position data and described pressure data that valve shutoff operation is associated.
17. methods according to claim 14, it is characterised in that
Described threshold value is by predetermined one group position corresponding with the position read and pressure data
Put with each in pressure data determined by tolerance value.
18. 1 kinds are used for the method testing the valve seat integrity of valve, and described method includes:
The Process Control System including valve is provided；
Control signal value is received from the controller of described control procedures system；
According to the described control signal value of degree reflecting that described valve will be opened, operation is described
Valve；
According to the control signal value received, carry out valve opening operation；
Read described control signal value and the position data of described valve；
Determine that whether described control signal value is higher than predetermined being associated with described valve seat integrity
Cutoff；
When described control signal value is confirmed as higher than described predetermined cutoff, determine described
Whether position data is less than described cutoff；
When described position data is determined to be below described cutoff, reads and store and institute
State pressure data and described position data that valve opening operation is associated；
Determine whether described position data indicates the seriality of described valve opening operation；
When described position data indicates the seriality of described valve opening operation, continue to read and deposit
Store up the described pressure data and described position data being associated with described valve opening operation；
By position data that accumulate during described valve opening operation, that stored and pressure data
With previously stored one group of position data and pressure corresponding to acceptable valve seat globality
Comparing of data；
According to described comparison, it may be judged whether reached and the described one group of position previously stored
That data and pressure data are associated, predetermined threshold value；And
In response to reaching the described judgement of described threshold value, generate alarm.
19. methods according to claim 18, it is characterised in that
Described carry out described valve opening operation be configured to during normal processes Engineering operation send out
Raw, wherein said controller is in response to being configured to the control routine that will be performed by described controller
Closed loop procedure control operation, described control signal is sent to described valve.
20. methods according to claim 18, it is characterised in that
Described carry out being configured to during normal processes plant operation of described valve opening operation
Occurring, wherein said controller is configured to described position data is processed as feedback information, institute
State feedback information and the closed loop control routine performed by described controller is used by being configured to.
21. methods according to claim 18, it is characterised in that
Described cutoff for described valve opening operation is 0.5%.
22. methods according to claim 18, it is characterised in that
Described control signal value is set point.
23. methods according to claim 18, it is characterised in that
The relative position relative to valve seat of described position data instruction valve closing element.
24. methods according to claim 18, it is characterised in that
Described threshold value is by predetermined one group position corresponding with the position stored and pressure data
Put and each tolerance value determined in pressure data.
25. methods according to claim 18, it is characterised in that
Described threshold value is the slope value mathematically calculated, by with the position stored and pressure data
Each in one group of the most predetermined position and pressure data determines slope value.
26. methods according to claim 18, it is characterised in that
Continue described continuation to read and store the described pressure being associated with described valve opening operation
Strong data and described position data, until the position data read indicates described valve not move.
27. methods according to claim 18, it is characterised in that
Described alarm includes visual alert instruction or alert message.
28. methods according to claim 18, it is characterised in that also include:
Read and store multiple examples of described pressure and position data；
Each example for described data carries out described comparison；And
When all examples of the data being read and being stored have been included in described comparison
Time middle, complete described comparison.
29. methods according to claim 18, it is characterised in that
The described one group of data previously stored include following at least one (i) system by described valve
Make business provide one group of data or (ii) when described valve seat integrity does not damages, previously from institute
State one group of data that valve is collected.
30. methods according to claim 18, it is characterised in that
The described one group of data previously stored include based on from except described in experience test
The pressure of the valve collection beyond valve and the model data collection of position data.
31. 1 kinds are used for the method testing the valve seat integrity of valve, and described method includes:
The Process Control System including valve is provided；
Control signal value is received from the controller of described control procedures system；
According to the described control signal value of degree reflecting that described valve will be opened, operation is described
Valve；
According to the control signal value received, carry out valve opening operation；
Read described control signal value and the position data of described valve；
Determine that whether described control signal value is higher than predetermined being associated with described valve seat integrity
Cutoff；
When described control signal value is confirmed as higher than described predetermined cutoff, determine described
Whether position data is less than described cutoff；
When described position data is determined to be below described cutoff, reads and open with described valve
Operate the pressure data and described position data being associated；
By based on the described position data read during described valve opening operation and pressure data
Value compare with the threshold value corresponding to acceptable valve seat integrity；
Judge according to described comparison, if reached predetermined threshold；And
In response to reaching the described judgement of described threshold value, generate alarm.
32. methods according to claim 31, it is characterised in that
Based on the described position data read during the described valve opening operation and pressure data
Described value is the slope value mathematically calculated, and described threshold value is according to corresponding to acceptable
The threshold slope that previously stored one group of position data of valve seat integrity and pressure data determine
Value.
33. methods according to claim 32, it is characterised in that also include:
Determine whether described position data indicates the seriality of described valve opening operation；And
When described position data indicates the seriality of described valve opening operation, continue to read and institute
State described position data and described pressure data that valve opening operation is associated.
34. methods according to claim 33, it is characterised in that
Described threshold value is by predetermined one group position corresponding with the position read and pressure data
Put with each in pressure data determined by tolerance value.
35. 1 kinds of sides for the valve seat integrity of test valve in Process Control System automatically
Method, wherein said valve includes valve seat and valve closing element, at the shutoff operation of described valve with open
During operation, described valve closing element is respectively facing and moves away from described valve seat, described method
Including:
Receive the set point of the controller from described Process Control System；
Described valve closing element is moved towards the position corresponding to the described set point for described valve；
Move towards the described position corresponding to described set point by being collected in described valve closing element
The valve seat integrity test data of dynamic period, carry out valve seat integrity test；
When described valve seat integrity test data are real less than predetermined cutoff and described valve
When executing valve opening operation or when described valve seat integrity test data are higher than predetermined cutoff
And described valve is when implementing valve shutoff operation, by assessment valve seat integrity test data not
Interrupt the described operation of described Process Control System and not by described valve and described process control system
System separates, and carries out described valve seat integrity test；
Wherein, the described operation of described Process Control System includes that closed loop procedure controls operation, its
Including described valve closing element towards the movement of described position corresponding to described set point.
36. methods according to claim 35, it is characterised in that
Described set point is received by localizer；And
Described localizer is configured to assess described valve seat integrity test data.
37. methods according to claim 35, it is characterised in that
Described set point is received by localizer；And
Described localizer is configured to store described valve seat integrity test data, and by described
Valve seat integrity test data send to software application, and wherein said software application assesses described valve
Seat integrity test data.
38. methods according to claim 35, it is characterised in that
Described set point is received by localizer；And
Described valve seat integrity test data are sent to software application by described localizer unceasingly,
Or having determined that described valve shutoff operation or described valve opening operation have reached the shape for assessment
After state, described valve seat integrity test data are sent to software application.
39. methods according to claim 35, it is characterised in that
Described set point is received by localizer；And
Described localizer is configured to or by comparing and collected valve seat integrity test number
According to one group of the most predetermined valve seat integrity test data, or by based on collected valve seat
Integrity test data determine the slope value that mathematically calculates and mathematically calculate described
Slope value compares with threshold slope value, continues to assess described valve seat integrity test data.
40. methods according to claim 35, it is characterised in that
Described set point is received by localizer；And
Described localizer is configured to or by comparing and collected valve seat integrity test number
According to one group of the most predetermined valve seat integrity test data, or by based on collected valve seat
Integrity test data determine the slope value that mathematically calculates and mathematically calculate described
Slope value compares with threshold slope value, continues to assess described valve seat integrity test data；And
Described valve seat integrity test data include position data and/or pressure data and time number
According to；Or position data and pressure data.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/957,836 | 2010-12-01 | ||
| US12/957,836 US8421643B2 (en) | 2010-12-01 | 2010-12-01 | Automatic valve seating integrity test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102486647A CN102486647A (en) | 2012-06-06 |
| CN102486647B true CN102486647B (en) | 2016-12-14 |
Family
ID=
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| US6382226B1 (en) * | 2001-04-17 | 2002-05-07 | Fisher Controls International, Inc. | Method for detecting broken valve stem |
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| US6131609A (en) * | 1996-06-11 | 2000-10-17 | Neles Controls Oy | Method for surveying the condition of a control valve, and a valve apparatus |
| US6298454B1 (en) * | 1999-02-22 | 2001-10-02 | Fisher-Rosemount Systems, Inc. | Diagnostics in a process control system |
| US6382226B1 (en) * | 2001-04-17 | 2002-05-07 | Fisher Controls International, Inc. | Method for detecting broken valve stem |
| CN1541859A (en) * | 2002-12-27 | 2004-11-03 | ���Ű�����ʽ���� | Range determination apparatus, range determination method, and program therefor |
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