US3536081A - Caustic flush method and apparatus for building water pipes - Google Patents

Caustic flush method and apparatus for building water pipes Download PDF

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US3536081A
US3536081A US852812A US3536081DA US3536081A US 3536081 A US3536081 A US 3536081A US 852812 A US852812 A US 852812A US 3536081D A US3536081D A US 3536081DA US 3536081 A US3536081 A US 3536081A
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building
water
tank
conduit
caustic
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August H Riess
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AUGUST H RIESS
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027Cleaning the internal surfaces; Removal of blockages
    • B08B9/032Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B08B9/0323Arrangements specially designed for simultaneous and parallel cleaning of a plurality of conduits

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  • an interior plumbing fixture e.g. wash basin, tub, shower, commode, etc.
  • the normal con nection is transiently interrupted and recoupled to the present assembly, and a similar connection is made to the assembly from a more remote point in the system, so as to form a closed path through the present operating assembly.
  • the latter then provides a mixing chamber, pump, filter, and hydraulic gage means so that cleaning liquid can be recirculated through this closed path or loop for the required period of time.
  • this time may be monitored by comparison of the difference in pressure through the treated portion of the conduits, as well as by noting the absence of loosened particles of rust or calcium in the flow as it returns to the tank (and before it passes through the filter unit(s)).
  • the closed path is opened by connecting the distant point to an outlet, the caustic is purged, and the system flushed with fresh water and recoupled to its initial connections.
  • an operating unit is portable and can be readily moved from one job or location to another.
  • a rejuvenating procedure can now be readily carried out relatively frequently, such as every year or two, so as to permanently maintain a full flow of water rather than awaiting the occurrence of a gross impedance in the line before attempting remedial action.
  • the present system and apparatus can likewise be used to rejuvenate steam boilers and other industrial systems which recycle liquids and consequently become internally obstructed by corrosion and depositions from the I 55 The most practical and readily available water-soluble water or other fluid.
  • caustic soda sodium hydroxide
  • the caustic soda may be transported in the dry or solid state and added to water in themixing tank at the time of use; of course carboys of aqueous (concentrated) sodium hydroxide can similarly be used.
  • the period of caustic treatment will vary with theliquid flow rate, pump pressure, thickness and non-uniformity of depositions or obstructions, treating temperature (both of liquid and of pipes), concentration or effective strength of the cleaning composition, etc.
  • about 1 pound of sodium hydroxide flakes are added for 8 gallons of water in the mixing tank 30, and this concentration may be circulated through a closed loop or path of the conduit system for a period of about 1 to 3 or 4 or more hours.
  • Subsequent flush or clean out of the system with fresh water may be accomplished '7 portable assembly, partly in vertical section and partly in elevation, operatively connected to the conduits of a building water system which are represented schematically.
  • the portable assembly 10 here depicted provides a pair of rear wheels 12 and a forward, caster-type wheel 14 connected to a carriage body 16 by suspension brackets 18, 20, with an upward projecting, handle bar 22 extending across the rear for guiding the assembly when manually moving it to and from a work location.
  • a dependent housing supports an electric motor 24 which operates a pump 25 by way of drive shaft 26. Electric current is obtained from a building outlet by an electric line 27, which also supplies a series of resistance units 28 which are supported atop an asbestos plate 29 and underlie the bottom wall of a liquid tank 30 for which they form a heating unit.
  • the body 16 of the assembly is formed with an outer wall 17 and an inner wall 19, separated by a thickness of insulating material 21 so as to form a heat-retaining liquid container or tank 30.
  • a removable filter screen 32 which overlies a central drain outlet 33 for the tank.
  • the open top of the tank is closed by a generally rectangular cover 34 which is removably secured by a peripheral series of edge-located fastening elements 35.
  • the top edge of the inner wall 36 of the cover is slanted convergingly downward to form a horizontally disposed, filter screen 37 which spacedly underlies an annular, courser, baffle plate 38 which in turn is centered beneath the outlet mouth 39 of a conduit 40 which overlies the cover and is supported thereabove by a bracket 41.
  • the conduit 40 is further secured at its outlet end by an annular fitting 42 which centers it respectively over the baffle plate 38, screen 37 and the body of the tank 30.
  • the conduit is provided with an inspection window 43 and a shut-off valve 44. More distally, there is a pressure gage 45 and a dependent length 46 with its shut-off valve 47 and an outlet 48 to a sewer or drainage line 49 (which may be an installation at the location where the apparatus is used).
  • a float 50 pivoted to the inner wall at 51 and with a lever arm 52 extending upward within a guide hoop 53 so as terminally to dispose a liquidlevel indicator 54 adjacent a read-out window 55 of the cover 34.
  • Conduit 58 from caustic tank outlet 33 goes past a shut-off valve 59 and temperature sensor 60, and through a connecting conduit 61 into the delivery pump 25 from which the liquid flow emerges through conduit 62, where at coupling 63 it can be joined to a building water supply system as by flexible conduit 70.
  • the conduit 62 is also connected to a linking conduit 64 which through a shutoff valve 65 is joined to the pump inlet line 61, and through a T 66, check valve 72 and flexible conduit segment 67 can be coupled to the outlet valve 68 of the hot water supply tank 69 of the building plumbing system.
  • the pump 25 may be used to circulate the heated water of tank 69 through the cold water lines of the building to which the pump delivery conduit 62 is at that time connected through coupling 63 and flexible conduit 70.
  • the hot water from building tank 69 may simply flow through the lines 67, 66, 64, and out 62 into the connected cold water lines-as long as the inlet line 71 of the tank is supplied by the municipal water pressure.
  • the building pipes thus connected may be heated by circulation of hot water from the tank 69 prior to flushing with cleaning solution from caustic tank 30, and the heated water may then be allowed to flow to a customary drain simply by opening valve 47 and closing valve 44.
  • a pre-treatment can of course also be applied to the hot water pipes of a building simply by running the hot water of tank 69 through them before circulating the caustic of tank 30.
  • Such conduit heating before contacting them with cleaning solution makes the action of the cleaner more effective; that is, it acts faster to loosen or dissolve encrustations when the temperature is higher.
  • Attachment of the present assembly to a building water system can conveniently be made at the first installation of a plumbing fixture in the building, beyond the water meter, such as a wash basin 11 which may have either of its hot or cold supply lines disconnected from the building conduit at the adjacent union 23, and the flexible conduit 70 coupled thereto.
  • a building conduit 73 of the same (hot or cold) system which (preferably) is returning from a distant part of the building, is coupled to the conduit 40 at 74, as by another length of flexible hose.
  • valve 47 With the valve 47 closed and the valve 44 open, the cleaning solution from tank 30 is circulated through the system by pump 25 (after preliminary pipe-heating, as just described) until the initial hydraulic pressure as shown by the gage 56 is decreased by no more than, say, 10 percent at gage 45, and the inspection window 43 no longer shows passing sediment particles.
  • the valves 44 and 59 are then closed and the valves 47 and 68 are opened to allow fresh water (from line 71) to flush out the system and be vented through drain 49.
  • This flush volume need not be heated in passage through tank 69 (that is, the heating unit may be turned off). If pump operation is desired for this flush operation, the valve 65 is also open and valve 75 is closed.
  • valve 65 If the valve 65 is closed and the pump 25 stopped, the city water from the line 71 will register its pressure at gage 56. With the valves 44 and 47 closed, the final pressure is indicated at gage 45. The differential of the two pressures will show the drop in pressure due to restrictions in the line. Such difference determined before and after caustic treatment, will show the improved pressure gained by the treatment.
  • the caustic solution it is not desirable to run the caustic solution through the tubes of the building hot water heater, which are usually made of copper. Accordingly, if the first connection of the present assembly is made at the building shut-off valve (adjacent the entrance water meter), the distant connection is then made just prior to the hot water heater and this length of conduit is cleaned by itself. The two connections can then be detached and recoupled to the hot water lines (a) at the union just beyond the hot water heater, and (b) at the remote end of the hot water lines, and this length (which carries the greatest amount of deposition) is then caustic treated.
  • the cold water lines can be treated as a single unit, and even simultaneous with the treatment of the hot water line, if two assemblies 10 are used; in this case, the cold water lines would be cleaned in shorter time than the hot water lines (beyond the heater 69) due to less deposition.
  • the method for removing pressure-reducing liquiddeposited encrustations from the interior of a course of normally liquid-conducting conduits which method comprises:
  • container means for introducing liquid-dispersible encrustation-loosening material into a fluid flow directed therethrough; means for coupling said container means to a selected portion of a conduit system which forms a liquid distribution system such as the water distribution system of a building, so as to form a continuous path for liquid circulation jointly through said portion of conduits and the coupled container means; pump means adapted to circulate the liquid dispersed encrustation-loosening material through said continuous path. and filter means for removing from said path, solid particles loosened from said conduits by the pumped fluid flow; and fluid-pressure measuring means located at two locations along said continuous path, whereby the progressive removal of internal conduit encrustation by the pumped fluid can be gaged by comparison of the difference of pressure.
  • the portable assembly of claim 6 which additionally includes heating means for heating the circulating fluid.
  • the portable assembly of claim 6 which includes flexible conduit and coupling means adapted to connect said selected portion of a conduit system with said container means and pump means at two points to form a closed path through the assembly.
  • the portable assembly of claim 6 which includes conduit and coupling means adapted to selectively join to said continuous path a hot water producing unit of the water system of the building.

Description

United States Patent [1113,536,08l
[72] Inventor August 11. Riess 2,222,516 11/1940 Powell et al. l34/22X 4425 W. 169th St., Lawndale, California 2,425,848 8/ 1947 Vawter 134/1 1 1X 90260 2,603,227 7/1952 Paxton 134/22UX [21] Appl. No. 852,812 2,653,420 9/1953 Ruth 134/22UX [22] Filed Aug. 25, 1969 2,835,234 5/1958 Rasch et al. l34/22X [45] Patented Oct. 27,1970 3,010,853 11/1961 Elliott 134/22X 3,156,584 11/1964 Yurdin 134/22X 3,169,545 2/1965 Kolling l34/22UX 1 CAUSTIC FLUSH METHOD AND APPARATUS FOR 3,295,538 1/1967 Williams... 134/111 BUILDING WA'IZER PIPES 3,431,145 3/1969 Riley 134/22 9 Claims 1 Drawmg Fig. Primary Examiner-Joseph Scovronek [52] U.S. Cl 134/22, Assistant Millman 134/103, 34/111, 134/169 Attorney-Howard L. Johnson [51] Int. Cl B08b 9/06; C23g 3/04 [50] Field ofSearch 134/22, ABSTRACT; A portable assembly cgntaining hydraulic pres- [56] References Cited UNITED STATES PATENTS 1,049,054 12/1912 Coombs 134/22UX 1,892,093 12/ 1932 Battistella 1. 134/22X 2,009,955 7/1935 Burns 134/169UX 2,089,317 8/1937 Wilder l34/22X sure gages, pump, heater, filter and mixing tank for caustic soda or other deposit-dissolving chemical(s), which tank can be coupled to two points of a building water system forming a closed loop for liquid circulation which may include each of the hot and cold water systems separately, but omit the hot water tank of the building. Removal of calcium incrustation within the pipe course and restoration of initial flow capacity can be judged by comparison of hydraulic pressure at beginning and end of the treated length.
CAUSTIC FLUSH METHOD AND APPARATUS FOR BUILDING WATER'PIPES STATEMENT OF THE INVENTION Particularly in localities where the local geological structure of the water source results in hard water", that is, having a relatively high mineral content (particularly calcium), the continued use of such water supply when piped into household and other edifices, resultsin a progressive deposition of calcium within the smaller pipes or conduits, especially in that portion carrying hot water (from the building water heater). Thus with Vz-Ol' ii-inch pipes which are commonly used in smaller buildings, over a period of years the mineral deposition may reduce the maximum flow at a faucet to a mere trickle. There has been no practical or satisfactory way to restore such flow short of replacing the pipes and fixtures. When such pipes are enclosed in the walls, as is usually the case with vertical conduits, the walls have to be broken open to gain access; and the total cost of' restoring both the pipes and the wall is expensive. By the present method and apparatus, however, such deposits can be removed from within the building water conduits without removing the conduits, or fracturing the building walls to get to them.
At an accessible location such as the connection of an interior plumbing fixture (e.g. wash basin, tub, shower, commode, etc.) to the building water conduits, the normal con nection is transiently interrupted and recoupled to the present assembly, and a similar connection is made to the assembly from a more remote point in the system, so as to form a closed path through the present operating assembly. The latter then provides a mixing chamber, pump, filter, and hydraulic gage means so that cleaning liquid can be recirculated through this closed path or loop for the required period of time. As noted in the above abstract, this time may be monitored by comparison of the difference in pressure through the treated portion of the conduits, as well as by noting the absence of loosened particles of rust or calcium in the flow as it returns to the tank (and before it passes through the filter unit(s)).
When the pressure or flow rate has thus been restored to normal, the closed path is opened by connecting the distant point to an outlet, the caustic is purged, and the system flushed with fresh water and recoupled to its initial connections. Such an operating unit is portable and can be readily moved from one job or location to another. Likewise, such a rejuvenating procedure can now be readily carried out relatively frequently, such as every year or two, so as to permanently maintain a full flow of water rather than awaiting the occurrence of a gross impedance in the line before attempting remedial action. The present system and apparatus can likewise be used to rejuvenate steam boilers and other industrial systems which recycle liquids and consequently become internally obstructed by corrosion and depositions from the I 55 The most practical and readily available water-soluble water or other fluid.
cleaning agent for this purpose is caustic soda (sodium hydroxide) although other substances may be employed (alone or in combination). The caustic soda may be transported in the dry or solid state and added to water in themixing tank at the time of use; of course carboys of aqueous (concentrated) sodium hydroxide can similarly be used.
The period of caustic treatment will vary with theliquid flow rate, pump pressure, thickness and non-uniformity of depositions or obstructions, treating temperature (both of liquid and of pipes), concentration or effective strength of the cleaning composition, etc. Conveniently, about 1 pound of sodium hydroxide flakes are added for 8 gallons of water in the mixing tank 30, and this concentration may be circulated through a closed loop or path of the conduit system for a period of about 1 to 3 or 4 or more hours. Subsequent flush or clean out of the system with fresh water may be accomplished '7 portable assembly, partly in vertical section and partly in elevation, operatively connected to the conduits of a building water system which are represented schematically.
The portable assembly 10 here depicted provides a pair of rear wheels 12 and a forward, caster-type wheel 14 connected to a carriage body 16 by suspension brackets 18, 20, with an upward projecting, handle bar 22 extending across the rear for guiding the assembly when manually moving it to and from a work location. A dependent housing supports an electric motor 24 which operates a pump 25 by way of drive shaft 26. Electric current is obtained from a building outlet by an electric line 27, which also supplies a series of resistance units 28 which are supported atop an asbestos plate 29 and underlie the bottom wall of a liquid tank 30 for which they form a heating unit.
The body 16 of the assembly is formed with an outer wall 17 and an inner wall 19, separated by a thickness of insulating material 21 so as to form a heat-retaining liquid container or tank 30. Across the tank bottomis lodged a removable filter screen 32 which overlies a central drain outlet 33 for the tank. The open top of the tank is closed by a generally rectangular cover 34 which is removably secured by a peripheral series of edge-located fastening elements 35. The top edge of the inner wall 36 of the cover is slanted convergingly downward to form a horizontally disposed, filter screen 37 which spacedly underlies an annular, courser, baffle plate 38 which in turn is centered beneath the outlet mouth 39 of a conduit 40 which overlies the cover and is supported thereabove by a bracket 41. The conduit 40 is further secured at its outlet end by an annular fitting 42 which centers it respectively over the baffle plate 38, screen 37 and the body of the tank 30. Intermediate its supported length, the conduit is provided with an inspection window 43 and a shut-off valve 44. More distally, there is a pressure gage 45 and a dependent length 46 with its shut-off valve 47 and an outlet 48 to a sewer or drainage line 49 (which may be an installation at the location where the apparatus is used).
Within the liquid area of the tank is a float 50, pivoted to the inner wall at 51 and with a lever arm 52 extending upward within a guide hoop 53 so as terminally to dispose a liquidlevel indicator 54 adjacent a read-out window 55 of the cover 34.
Beneath the floor of the tank 30 is a composite control valve and conduit chamber 57 (here represented schematically on a vertical plane for greater clarity). Conduit 58 from caustic tank outlet 33 goes past a shut-off valve 59 and temperature sensor 60, and through a connecting conduit 61 into the delivery pump 25 from which the liquid flow emerges through conduit 62, where at coupling 63 it can be joined to a building water supply system as by flexible conduit 70. The conduit 62 is also connected to a linking conduit 64 which through a shutoff valve 65 is joined to the pump inlet line 61, and through a T 66, check valve 72 and flexible conduit segment 67 can be coupled to the outlet valve 68 of the hot water supply tank 69 of the building plumbing system. Thus, with the valve 59 closed and the hot water valve 65 open, the pump 25 may be used to circulate the heated water of tank 69 through the cold water lines of the building to which the pump delivery conduit 62 is at that time connected through coupling 63 and flexible conduit 70. Or, without the operation of pump 25, the hot water from building tank 69 may simply flow through the lines 67, 66, 64, and out 62 into the connected cold water lines-as long as the inlet line 71 of the tank is supplied by the municipal water pressure.
The building pipes thus connected may be heated by circulation of hot water from the tank 69 prior to flushing with cleaning solution from caustic tank 30, and the heated water may then be allowed to flow to a customary drain simply by opening valve 47 and closing valve 44. A pre-treatment can of course also be applied to the hot water pipes of a building simply by running the hot water of tank 69 through them before circulating the caustic of tank 30. Such conduit heating before contacting them with cleaning solution, makes the action of the cleaner more effective; that is, it acts faster to loosen or dissolve encrustations when the temperature is higher.
Attachment of the present assembly to a building water system can conveniently be made at the first installation of a plumbing fixture in the building, beyond the water meter, such as a wash basin 11 which may have either of its hot or cold supply lines disconnected from the building conduit at the adjacent union 23, and the flexible conduit 70 coupled thereto. A building conduit 73 of the same (hot or cold) system which (preferably) is returning from a distant part of the building, is coupled to the conduit 40 at 74, as by another length of flexible hose. With the valve 47 closed and the valve 44 open, the cleaning solution from tank 30 is circulated through the system by pump 25 (after preliminary pipe-heating, as just described) until the initial hydraulic pressure as shown by the gage 56 is decreased by no more than, say, 10 percent at gage 45, and the inspection window 43 no longer shows passing sediment particles. The valves 44 and 59 are then closed and the valves 47 and 68 are opened to allow fresh water (from line 71) to flush out the system and be vented through drain 49. This flush volume need not be heated in passage through tank 69 (that is, the heating unit may be turned off). If pump operation is desired for this flush operation, the valve 65 is also open and valve 75 is closed.
If the valve 65 is closed and the pump 25 stopped, the city water from the line 71 will register its pressure at gage 56. With the valves 44 and 47 closed, the final pressure is indicated at gage 45. The differential of the two pressures will show the drop in pressure due to restrictions in the line. Such difference determined before and after caustic treatment, will show the improved pressure gained by the treatment.
In summary, it is not desirable to run the caustic solution through the tubes of the building hot water heater, which are usually made of copper. Accordingly, if the first connection of the present assembly is made at the building shut-off valve (adjacent the entrance water meter), the distant connection is then made just prior to the hot water heater and this length of conduit is cleaned by itself. The two connections can then be detached and recoupled to the hot water lines (a) at the union just beyond the hot water heater, and (b) at the remote end of the hot water lines, and this length (which carries the greatest amount of deposition) is then caustic treated. However, the cold water lines can be treated as a single unit, and even simultaneous with the treatment of the hot water line, if two assemblies 10 are used; in this case, the cold water lines would be cleaned in shorter time than the hot water lines (beyond the heater 69) due to less deposition.
lclaim:
l. The method for removing pressure-reducing liquiddeposited encrustations from the interior of a course of normally liquid-conducting conduits, which method comprises:
disconnecting a portion of said course of conduits at two locations and temporarily coupling together said two locations to form a closed path for repetitive circulation of liquid through the disconnected portion; circulating a liquid containing an encrustation-loosening component through said closed path and removing loosened encrustations from the circulating liquid;
measuring the liquid pressure at two locations along said disconnected portion which show a drop in pressure resulting from the presence of said encrustations, and continuing the circulation between said locations until the downstream pressure at the second location has been restored approximately to its initial pressure by removal of the causative encrustations; and
flushing out said encrustation-loosening component from the closed path, uncoupling the temporary connection of the two locations, and reconnecting the conduits for their normal conveyance of liquid.
2. The method of claim 1 wherein said liquid containing an encrustation-loosening component is circulated at an elevated temperature resulting from the deliberate application of heat. 3. The method of claim 1 wherein said encrustation-loosening component comprises sodium hydroxide.
4. The method of claim 1 which is applied to water conduits which are permanently installed within the walls of a building.
5. The method of claim 1 which includes circulating through said closed path which is formed through the cold water conduits of a building, heated water directed therethrough from the hot water system of said building prior to circulation of said encrustation-loosening component.
6. A portable assembly of the character described, comprising in combination:
container means for introducing liquid-dispersible encrustation-loosening material into a fluid flow directed therethrough; means for coupling said container means to a selected portion of a conduit system which forms a liquid distribution system such as the water distribution system of a building, so as to form a continuous path for liquid circulation jointly through said portion of conduits and the coupled container means; pump means adapted to circulate the liquid dispersed encrustation-loosening material through said continuous path. and filter means for removing from said path, solid particles loosened from said conduits by the pumped fluid flow; and fluid-pressure measuring means located at two locations along said continuous path, whereby the progressive removal of internal conduit encrustation by the pumped fluid can be gaged by comparison of the difference of pressure. 7. The portable assembly of claim 6 which additionally includes heating means for heating the circulating fluid.
8. The portable assembly of claim 6 which includes flexible conduit and coupling means adapted to connect said selected portion of a conduit system with said container means and pump means at two points to form a closed path through the assembly.
9. The portable assembly of claim 6 which includes conduit and coupling means adapted to selectively join to said continuous path a hot water producing unit of the water system of the building.
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Cited By (23)

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US3635230A (en) * 1970-05-13 1972-01-18 John A Kirschke Root fumigant sewer cleaner sprayer
US3963438A (en) * 1974-06-21 1976-06-15 Banez Armin V Method of sterilizing a fiberoptic proctoscope
US4333773A (en) * 1980-06-19 1982-06-08 Fjaellstroem Bengt Method for internal washing or cleaning and rinsing or drying of tubular materials
FR2498488A1 (en) * 1981-01-27 1982-07-30 Dipan Sa PROCESS FOR CLEANING PIPES AND DEVICE FOR IMPLEMENTING SAME
US4415369A (en) * 1982-03-17 1983-11-15 Allmendinger James M Injection tank for cleaning boilers and heat exchangers
FR2532563A1 (en) * 1982-09-06 1984-03-09 Renault AUTOMATIC CLEANING DEVICE IN PARTICULAR FOR EXHAUST GAS ANALYSIS BAYS
US4668303A (en) * 1983-08-04 1987-05-26 Exxon Research And Engineering Company Method of preventing stress corrosion in a bellows expansion joint
US4971087A (en) * 1987-07-13 1990-11-20 Tetra Dev-Co Arrangement of packing machines
US5265629A (en) * 1991-05-10 1993-11-30 Applied Hydro Dynamics, Inc. Universal cleaning system utilizing cavitating fluid
US5642746A (en) * 1996-02-23 1997-07-01 Sayce; Norman C. Flushing system for a holding tank of a recreational vehicle
US5706841A (en) * 1993-01-13 1998-01-13 Lars Werre Arrangement for cleaning automatically heat-exchanging passageways, particularly tool-coolant passageways
US6161558A (en) * 1998-11-25 2000-12-19 Electrol Specialties Company Portable clean-in-place system for batch processing equipment
FR2800647A1 (en) * 1999-11-10 2001-05-11 Progalva Net Et 9 PIPE CLEANING MACHINE
US6289905B1 (en) * 1998-02-03 2001-09-18 Dennis Roy Yarnold Engine cleaning
US6305393B1 (en) * 1999-11-04 2001-10-23 Pang Chiech Lin Flushing system with pressurized air
US6502590B1 (en) * 2000-08-31 2003-01-07 Koninklijke Philips Electronics N.V. Method and apparatus for flushing x-ray tube heat exchanger
US6604536B1 (en) * 1999-08-02 2003-08-12 Miller Environmental Group, Inc. Apparatus for removing PCBs, contaminants and debris from gas transmission lines
US20040069323A1 (en) * 2002-10-15 2004-04-15 Steve Komarek System and method for cleaning occluded water pipes in structures
US20040187897A1 (en) * 2002-12-18 2004-09-30 Andy Kenowski Monitoring device and method for operating clean-in-place system
DE102007004278A1 (en) * 2007-01-23 2008-07-24 Clepsys Gbr (Vertungsberechtigte Gesellschafter:Christian Bies Sewer pipe i.e. toilet drain, cleaning method for e.g. aircraft, involves performing flushing agent-supply and returning flushing agent into collecting tank when flown through pipe, such that agent is circulated in closed circular flow
US20120118246A1 (en) * 2010-11-16 2012-05-17 Zoeller Company Sealed and self-contained tankless water heater flushing system
US10775076B2 (en) * 2018-03-18 2020-09-15 Nerd Concepts, inc. Water container flushing system including sediment separator, sediment buster and associated methods
US11143215B2 (en) * 2016-08-05 2021-10-12 Voith Patent Gmbh Method and apparatus for cleaning and/or replacing hydraulic oil in hydraulic drives

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635230A (en) * 1970-05-13 1972-01-18 John A Kirschke Root fumigant sewer cleaner sprayer
US3963438A (en) * 1974-06-21 1976-06-15 Banez Armin V Method of sterilizing a fiberoptic proctoscope
US4333773A (en) * 1980-06-19 1982-06-08 Fjaellstroem Bengt Method for internal washing or cleaning and rinsing or drying of tubular materials
FR2498488A1 (en) * 1981-01-27 1982-07-30 Dipan Sa PROCESS FOR CLEANING PIPES AND DEVICE FOR IMPLEMENTING SAME
US4415369A (en) * 1982-03-17 1983-11-15 Allmendinger James M Injection tank for cleaning boilers and heat exchangers
FR2532563A1 (en) * 1982-09-06 1984-03-09 Renault AUTOMATIC CLEANING DEVICE IN PARTICULAR FOR EXHAUST GAS ANALYSIS BAYS
US4668303A (en) * 1983-08-04 1987-05-26 Exxon Research And Engineering Company Method of preventing stress corrosion in a bellows expansion joint
US4971087A (en) * 1987-07-13 1990-11-20 Tetra Dev-Co Arrangement of packing machines
US5265629A (en) * 1991-05-10 1993-11-30 Applied Hydro Dynamics, Inc. Universal cleaning system utilizing cavitating fluid
US5706841A (en) * 1993-01-13 1998-01-13 Lars Werre Arrangement for cleaning automatically heat-exchanging passageways, particularly tool-coolant passageways
US5642746A (en) * 1996-02-23 1997-07-01 Sayce; Norman C. Flushing system for a holding tank of a recreational vehicle
US6289905B1 (en) * 1998-02-03 2001-09-18 Dennis Roy Yarnold Engine cleaning
US6161558A (en) * 1998-11-25 2000-12-19 Electrol Specialties Company Portable clean-in-place system for batch processing equipment
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