WO1995035419A1 - Procede de nettoyage et d'entretien de systemes de conduites de distribution d'eau potable au moyen d'une solution de nettoyage chauffee - Google Patents

Procede de nettoyage et d'entretien de systemes de conduites de distribution d'eau potable au moyen d'une solution de nettoyage chauffee Download PDF

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Publication number
WO1995035419A1
WO1995035419A1 PCT/US1995/007546 US9507546W WO9535419A1 WO 1995035419 A1 WO1995035419 A1 WO 1995035419A1 US 9507546 W US9507546 W US 9507546W WO 9535419 A1 WO9535419 A1 WO 9535419A1
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WO
WIPO (PCT)
Prior art keywords
acid
cleaning solution
pipe
scale
solution
Prior art date
Application number
PCT/US1995/007546
Other languages
English (en)
Inventor
Edward Charles Perry
Jerome H. Ludwig
Original Assignee
H.E.R.C. Products Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by H.E.R.C. Products Incorporated filed Critical H.E.R.C. Products Incorporated
Priority to AU28283/95A priority Critical patent/AU2828395A/en
Priority to BR9505483A priority patent/BR9505483A/pt
Priority to CA002193494A priority patent/CA2193494C/fr
Priority to EP95923862A priority patent/EP0766765A1/fr
Publication of WO1995035419A1 publication Critical patent/WO1995035419A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/083—Mineral agents
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/042—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2075—Carboxylic acids-salts thereof
    • C11D3/2079—Monocarboxylic acids-salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2075—Carboxylic acids-salts thereof
    • C11D3/2082—Polycarboxylic acids-salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2075—Carboxylic acids-salts thereof
    • C11D3/2086—Hydroxy carboxylic acids-salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/34—Organic compounds containing sulfur
    • C11D3/3418—Toluene -, xylene -, cumene -, benzene - or naphthalene sulfonates or sulfates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/08—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/265—Carboxylic acids or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/32—Organic compounds containing nitrogen
    • C11D7/3218—Alkanolamines or alkanolimines
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/006—Arrangements or methods for cleaning or refurbishing water conduits

Definitions

  • scale, tuberculation and sedimentation will increase the possibility of corrosion in the water distribution pipe along with promoting the growth of other organisms.
  • the organisms also can be a health hazard, promoting corrosion and biomass which binds scale and sediment together and to the surfaces of the system. Corrosion can eventually lead to the leakage of the system and the necessity to replace the leaking section.
  • microbiological tuberculation found in water distribution pipes and wells are typically due to -3- iron and manganese bacteria that attach themselves to the walls of the pipe and live on the soluble iron or manganese in the water along with other nutrients. Their spaghetti-like features also allow them to trap all particulate matter which is present in the water.
  • iron bacteria there are over 20 different iron bacteria that have been characterized. As part of their metabolism, they convert ferrous ion to ferric ion which results in iron oxide (rust) accumulation in the tuberculation.
  • Manganese bacteria convert manganous ion to manganic ion which results in manganese dioxide accumulation in the tuberculation in the water pipe. After generations of bacteria, the iron oxide, manganese dioxide, particulate matter and biomass accumulation on the side of the pipe results in mounds of tuberculated "growth 11 annalogous to a coral reef.
  • Tuberculation can also interfere with valve and hydrant performance and operation. There can also be corrosive sulfate reducing bacteria that live under the tuberculation and cause pipe corrosion.
  • This invention is directed to a method of cleaning and maintaining water distribution systems by employing cleaning solutions at elevated temperatures.
  • Water systems having interior scale and sediment deposits are cleaned by introducing and circulating an effective amount of an aqueous treatment solution for a sufficient period of time at an elevated temperature which results in the solution, loosening and suspension of the undesired scale and sediment.
  • the scale is associated with sulfate-reducing and iron bacteria consisting primarily of iron oxide, biomass and sediment.
  • other bacteria such as manganese bacteria may be involved in the microbial tuberculation found in water distribution pipes.
  • ⁇ • scale-' as the term is used herein, is intended to include microbial tuberculation associated with such bacteria or other bacteria.
  • potable water distribution systems may be cleaned and maintained by employing cleaning or treating solutions at elevated temperatures. In general, temperatures on the order of about 40° to about 80°C have been employed and, more particularly, from about 40° to about 50°C.
  • water distribution pipes may be cleaned of tuberculation more rapidly, for example, tuberculated pipes cleaned at ambient temperature over a period of about twelve hours may be cleaned in a matter of about 1-2 hours where the cleaning solution has been elevated in temperature to about 75° to 80°C.
  • the cleaning solution may be acidic, neutral or basic.
  • mineral acids or organic acids, and mixtures thereof are employed as acidic treatment solutions.
  • the acidic treatment solution may contain further additives such as inhibitors, chelating agents, penetrating and/or dispersing agents to assist in the removal of scale and sediment and to minimize any adverse effects on the pipes, valves, or other system surfaces due to the acids employed.
  • This invention provides a simple, low cost and effective method of removing water scale and sediment from water distribution systems in order to maintain proper water flow, operation and to prevent corrosion of the system which would require the high cost and inconvenience of replacement.
  • acidic treatment solutions found to be useful in practicing the method of this invention are aqueous solutions of mineral acids such as hydrochloric, nitric, phosphoric, polyphosphoric, hydrofluoric, boric, sulfuric, sulfurous, and the like.
  • Aqueous solutions of mono-, di- and polybasic organic acids have also been found to be useful and include formic, acetic, propionic, citric, glycolic, lactic, tartaric, polyacrylic, succinic, p-toluenesulfonic, and the like.
  • the useful treatment solutions may also be aqueous mixtures of the above mineral and organic acids.
  • Alkaline, acid, or neutral cleaning solutions may also be employed, as indicated above, depending upon the type of scale that needs to be removed.
  • Sequestering or chelating agents such as EDTA (ethylenediamine tetraacetic acid) , NTA (nitrilotriacetic acid), and derivatives, i.e., basic alkali salts, and the like have also been found to be useful in the treatment solution in certain cases.
  • the acidic treatment solution may also contain acid inhibitors which substantially reduce the acidic action on metal surfaces of the water distribution system, particularly valves, fire hydrants, etc., and these various inhibitors for acids have been well documented in the patent art. Typical, but not necessarily all inclusive, examples of acid inhibitors are disclosed in the following U.S.
  • Patents 2,758,970; 2,807,585; 2,941,949; 3,077,454; 3,607,781; 3,668,137; 3,885,913; 4,089,795; 4,199,469; 4,310,435; 4,541,945; 4,554,090; 4,587,030; 4,614,600; 4,637,899; 4,670,186; 4,780,150 and 4,851,149 which are incorporated herein by reference.
  • the treatment solution may also contain dispersing, penetrating or emulsifying agents to assist in the removal of the scale and sediment. These surface active agents may be anionic, cationic, nonionic or a photeric as defined in the art.
  • Fig. 1 is a schematic of a laboratory test system illustrating the method of this invention.
  • Fig. 2 is a diagram of a field system for cleaning a potable water distribution system.
  • a laboratory test system is shown to evaluate the removal of scale and sediment by acidic treating solutions from a test pipe sample taken from a water distribution system.
  • This system includes a 15 gallon acidic treating solution reservoir 5, submersible acidic treating solution circulation pump 6 rated at 1200 gallons per hour, 1" inlet transfer line 7, drain valve 8, heavy rubber diaphragm seals 9 for the ends of the test pipe specimen 10, 1" outlet transfer line 11 and the treating solution 12.
  • the test pipe specimen 10 is mounted at about a 30 degree angle so that the test solution will contact essentially the entire inner pipe surface to be treated.
  • a laboratory test for example, was run on a four foot section of 6" diameter pipe which had been removed from a potable water distribution system that had been used for over 40 years.
  • the scale on the inside of the pipe consisted of tuberculated nodules of up to 1 to 1% inches in height covering 100% of the inside pipe surface which had substantially reduced the opening inside the pipe for water to flow. Analysis of the scale indicated it consisted of primarily iron with some calcium, magnesium and manganese in the form oxides, hydroxides and carbonates along with fine mineral acid insoluble solids and some ⁇ biomass". This is typical scale associated with manganese and iron bacteria along with the associated corrosion.
  • a field equipment and system diagram is shown which may be employed in the cleaning of a potable water pipe distribution system.
  • Two 500 gallon treating solution reservoir tanks 20 and 21 along with a 100 gallon per minute circulation pump 22 and sight glass 23 are mounted on a flat bed truck (not shown) .
  • a heating means 22A is also shown.
  • a 2% inlet pipe 24 is secured to a 650 foot section of 6" water distribution pipe 25 after the main shut off valve 26.
  • the fire hydrant 27 and fire hose 28 were employed for the acidic treating solution return to tanks 20 and 21.
  • the section of pipe 25 to be treated was isolated by closing off the two water main shut-off valves 26 and 29 along with all service line valves, typically 30 and 31. With valves 32 and 33 closed, 1000 gallons of acidic treating solution was prepared in tanks 20 and 21. With the coupling 34 open, the treating solution was allowed to enter the system by opening valves 33 and 35 and turning on the circulation pump 22. The pH of the water coming from the open coupling was then monitored until a decrease was noted which indicated the acid treating solution had displaced the water in the section to be treated. The circulation pump 22 was turned off and the coupling 34 connected. Valves 36 and 37 were then closed and valve 32 opened for circulation. The circulation pump 22 was then started again for the treatment period.
  • Valve 37 was closed to allow for loosened solids to accumulate in tank 20 while the treating solution could overflow at 38 to tank 21 which reduces the chances of plugging during treatment.
  • the treating solution was then circulated in the system of Fig. 2 for a period of 5 hours at about 20°C. Observation of the treating solution through the sight glass 23 showed an increasingly darker discoloration with time.
  • the circulation pump 22 was turned off, and valves 33 and 35 were closed.
  • the main shut-off valve 26 was slowly opened and fresh water allowed to enter the system until the treating solution was displaced as noted when the tanks 20 and 21 were full. Valve 32 was then closed.
  • the fire hose 28 was then disconnected from the fire hydrant 27 and the main shut-off valve 26 opened full to allow high pressure flushing of the treated water main 25. As the flush water emerged from the fire hydrant 27 it was dark in color with considerable tuberculation or scale and sediment solids. Flushing continued until the flush water was clean of solids for a period of time prior to putting the treated section of the water distribution system back into service.
  • the flow rate through the fire hydrant 27 prior to treatment had been determined by a Pitot Gauge to be 588 gallons per minute. After treatment, the flow rate was determined to be 790 gallons per minute. This was an increase of 34.5%.
  • cleaning solution met the requirements of the National Sanitation Foundation (NSF International, Ann Arbor, Michigan) , Standard 60 for potable water distribution systems.
  • Other examples of cleaning solutions may be employed as follows:
  • the above preblended cleaning solution is used in an amount of about 12.5% by weight with water in the field for cleaning an underground potable water distribution pipe system.
  • the solution may be employed in amounts of from about 5 to about 50% by weight with water in the field, depending upon such variables as the amount of tuberculation or scale, pipe volume to be cleaned, circulation time and other factors.
  • the amounts of anhydrous chemicals in a broader range of ingredients are about 1% to 27% HC1, 0.1% to 10% glycolic acid, 0.04% to 5% sodium xylene sulfonate and about 0.1% to 5% of the triethanolamine/diethanolomine mixture (hereinafter referred to as "TEA") .
  • TAA triethanolamine/diethanolomine mixture
  • hydrochloric acid may be added to a concentrate of the glycolic acid, sodium xylene sulfonate and TEA.
  • hydrochloric acid may be added to a concentrate of the glycolic acid, sodium xylene sulfonate and TEA.
  • the cleaning solution is then introduced from a tank into the pipe section and, if water is in that section of pipe, it is removed upon the introduction of the cleaning solution.
  • circulation of the cleaning solution through the underground pipe is initiated for a sufficient period of time for solubilization, loosening and/or suspension of the scale, tuberculation and sediments.
  • a soap having a 1:1 stoichiometric equivalent of the acid (HCl and glycolic acid) and TEA base is formed with an excess of the acid.
  • This composition has been found to work effectively in the field for the removal of scale and tuberculation associated with iron bacteria consisting primarily of iron oxide, biomass and sediment.
  • These 1:1 soaps have also been described in the above referred to co-pending Application Serial No. 07/700,780, filed May 16, 1991, now U.S. Patent No. and the disclosure thereof is incorporated herein in its entirety by reference.
  • These soaps may be more generally categorized as soaps of mineral and/or organic acids and a base such as an amine and ammonia.
  • soaps include 1:1 soaps of TEA and glycolic acid (also known as hydroxyacetic acid) ; TEA and acetic acid; TEA and citric acid; TEA and benzoic acid; hydrochloric acid and ammonia; sulfuric acid and ammonia; nitric acid and ammonia; TEA and hydrochloric acid; TEA and sulfuric acid; TEA and nitric acid; ammonia and glycolic acid; ammonia and benzoic acid; and ammonia and p- toluenesulfonic acid.
  • TEA and glycolic acid also known as hydroxyacetic acid
  • TEA and citric acid also known as hydroxyacetic acid
  • TEA and benzoic acid hydrochloric acid and ammonia
  • sulfuric acid and ammonia sulfuric acid and ammonia
  • nitric acid and ammonia nitric acid
  • TEA and hydrochloric acid TEA and sulfuric acid
  • EXAMPLE 1 CLEANING OF TUBERCULATION FROM POTABLE WATER DISTRIBUTION PIPE AT AMBIENT AND ELEVATED TEMPERATURES
  • a 4" diameter potable water distribution pipe obtained from a town in Arizona having up to 1" of tuberculation on the inside pipe wall was cut into two 2-foot lengths for cleaning on the pipe testing station.
  • the tuberculation consisted primarily of iron oxide, manganese oxide and biomass.
  • a treating solution was prepared by mixing the "Preblend Ingredients" (by wt.) of 87% muriatic acid, 5% glycolic acid, 2% sodium xylene sulfonate, 3% triethanolamine/diethanolamine mixture, and water in the test station mixing tank.
  • the treating solution was then circulated through the pipe section at ambient temperature using an electric 110 gallon/minute swimming pool circulating pump. The test was run for 5 hours and the pipe section was inspected. Considerable tuberculation was still present.
  • the second section of the pipe was mounted and cleaned in the same manner except that a gasoline engine driven pump was employed.
  • the pump was mounted on the crank case of the engine which caused the pump and the circulating treating solution to be heated during the test.
  • the pump was rated at 155 gallons per minute.
  • the test was run for 1 1/4 hours at which time the treating solution was hot to the touch and estimated to be about 75-80 degrees centigrade.
  • the interior wall of the pipe was essentially as clean as the pipe section cleaned at ambient temperature for 13 hours.
  • EXAMPLE 2 CLEANING OF TUBERCULATION FROM A HEAVILY TUBERCULATED WATER DISTRIBUTION PIPE BY
  • a treating solution was prepared as in Example 1.
  • Circulation was begun using the electric 110 gallon per minute circulation pump at ambient temperature. The test was run for 11 hours and the pipe section inspected. Heavy tuberculation remained, about 1/2" of tuberculation had been removed.
  • the pipe was clean of tuberculation.
  • about 25% of the cross sectional area of tuberculation was removed after 18 hours of ambient temperature treating solution circulation and about 75% of the cross sectional area of tuberculation was removed by 2 1/4 hours of periodic elevated temperature treating solution circulation as described above.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Public Health (AREA)
  • Detergent Compositions (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning In General (AREA)

Abstract

L'invention concerne un procédé de nettoyage et d'entretien de systèmes de distribution d'eau potable, dont le débit est réduit à cause de l'augmentation de dépôts ou de sédiments sur la surface intérieure des conduites. On chauffe une solution de nettoyage acide et aqueuse (12) et on la fait circuler à travers la conduite (25) à traiter pendant une durée suffisante pour dissoudre et détacher les dépôts ou les sédiments, puis on évacue de ladite conduite (25) la solution utilisée contenant les dépôts et les sédiments dissous ou en suspension, ce qui permet d'obtenir une conduite nettoyée, dont le débit est amélioré. Il est également souhaitable de rincer les conduites avec de l'eau sous haute pression après le traitement, afin d'éliminer les dépôts et les sédiments qui n'auraient pas été extraits pendant la circulation et le rinçage de la solution de traitement (12).
PCT/US1995/007546 1994-06-20 1995-06-14 Procede de nettoyage et d'entretien de systemes de conduites de distribution d'eau potable au moyen d'une solution de nettoyage chauffee WO1995035419A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU28283/95A AU2828395A (en) 1994-06-20 1995-06-14 Method of cleaning and maintaining potable water distribution pipe systems with a heated cleaning solution
BR9505483A BR9505483A (pt) 1994-06-20 1995-06-14 Processo para limpar sistema de distribução de distribuição de águasubterrânea e processo para limpar sistema de lubo de distribuição de água subterrânea potável
CA002193494A CA2193494C (fr) 1994-06-20 1995-06-14 Procede de nettoyage et d'entretien de systemes de conduites de distribution d'eau potable au moyen d'une solution de nettoyage chauffee
EP95923862A EP0766765A1 (fr) 1994-06-20 1995-06-14 Procede de nettoyage et d'entretien de systemes de conduites de distribution d'eau potable au moyen d'une solution de nettoyage chauffee

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26260194A 1994-06-20 1994-06-20
US08/262,601 1994-06-20

Publications (1)

Publication Number Publication Date
WO1995035419A1 true WO1995035419A1 (fr) 1995-12-28

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PCT/US1995/007546 WO1995035419A1 (fr) 1994-06-20 1995-06-14 Procede de nettoyage et d'entretien de systemes de conduites de distribution d'eau potable au moyen d'une solution de nettoyage chauffee

Country Status (7)

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EP (1) EP0766765A1 (fr)
AU (1) AU2828395A (fr)
BR (1) BR9505483A (fr)
CA (1) CA2193494C (fr)
IL (1) IL114194A0 (fr)
MY (1) MY115961A (fr)
WO (1) WO1995035419A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1008158C2 (nl) * 1998-01-29 1999-08-02 Waste Treatment Patents & Res Werkwijze voor het verwijderen van anorganische en organische aanslag van oppervlakken van een verticale buisreactor.
CN114713577A (zh) * 2022-04-25 2022-07-08 广东韶钢松山股份有限公司 一种煤气脱氨设备的清洗方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6920897B2 (en) 2001-03-27 2005-07-26 Blair J. Poirier Potable water circulation system
US6705344B2 (en) 2001-03-27 2004-03-16 Blair J. Poirier Potable water circulation system

Citations (15)

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EP0027980A1 (fr) * 1979-10-24 1981-05-06 Georg Fischer Aktiengesellschaft Procédé et installation pour rincer, nettoyer, désinfecter et pour le revêtement intérieur d'une conduite, en particulier une conduite d'eau dans une nouvelle construction
FR2498488A1 (fr) * 1981-01-27 1982-07-30 Dipan Sa Procede pour le nettoyage de tuyauteries et dispositif pour sa mise en oeuvre
FR2517571A1 (fr) * 1981-12-07 1983-06-10 Roussel Herve Machine a detartrer
EP0183894A2 (fr) * 1984-11-30 1986-06-11 Feldmann-Chemie GmbH Utilisation des mélanges d'acides et/ou de sels acides pour l'élimination de dépôts ou de taches de fer ou de manganèse
FR2602571A1 (fr) * 1986-08-06 1988-02-12 Assainissement Rationnel Pompa Procede de nettoyage d'une conduite notamment d'un reseau de distribution d'eau potable et systeme pour la mise en oeuvre de ce procede
EP0260649A2 (fr) * 1986-09-16 1988-03-23 Wegener, Paul Méthode pour le nettoyage intérieur de systèmes de tubes ramifiés et/ou d'ensembles, ainsi que dispositif pour la réalisation de cette méthode
US4806169A (en) * 1982-12-01 1989-02-21 R. Spane Gmbh & Co. Kg Process for the removal of solid deposits from water supply installations
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EP0456272A1 (fr) * 1990-05-11 1991-11-13 Heimo Wessollek Agent de nettoyage pour des installations à l'eau potable
EP0456271A1 (fr) * 1990-05-11 1991-11-13 Wessollek, Heimo Agent de nettoyage pour des installations d'eau potable
WO1992020629A1 (fr) * 1991-05-16 1992-11-26 H.E.R.C. Incorporated Compositions de savon aux acides carboxyliques et aux amines utiles pour eliminer et empêcher la formation de tartre
DE4125315A1 (de) * 1991-07-31 1993-02-04 Oertzen Arndt H Gmbh & Co Vorrichtung zum reinigen von rohrleitungen
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FR2517571A1 (fr) * 1981-12-07 1983-06-10 Roussel Herve Machine a detartrer
US4806169A (en) * 1982-12-01 1989-02-21 R. Spane Gmbh & Co. Kg Process for the removal of solid deposits from water supply installations
EP0183894A2 (fr) * 1984-11-30 1986-06-11 Feldmann-Chemie GmbH Utilisation des mélanges d'acides et/ou de sels acides pour l'élimination de dépôts ou de taches de fer ou de manganèse
FR2602571A1 (fr) * 1986-08-06 1988-02-12 Assainissement Rationnel Pompa Procede de nettoyage d'une conduite notamment d'un reseau de distribution d'eau potable et systeme pour la mise en oeuvre de ce procede
EP0260649A2 (fr) * 1986-09-16 1988-03-23 Wegener, Paul Méthode pour le nettoyage intérieur de systèmes de tubes ramifiés et/ou d'ensembles, ainsi que dispositif pour la réalisation de cette méthode
DE3731441A1 (de) * 1987-08-13 1989-02-23 Imhof Elisabeth Verfahren und vorrichtung zur reinigung, korrosionsbeseitigung, ggf. entkalkung und versiegelung von gebaeudewasserinstallationen
EP0456272A1 (fr) * 1990-05-11 1991-11-13 Heimo Wessollek Agent de nettoyage pour des installations à l'eau potable
EP0456271A1 (fr) * 1990-05-11 1991-11-13 Wessollek, Heimo Agent de nettoyage pour des installations d'eau potable
WO1992020629A1 (fr) * 1991-05-16 1992-11-26 H.E.R.C. Incorporated Compositions de savon aux acides carboxyliques et aux amines utiles pour eliminer et empêcher la formation de tartre
DE4125315A1 (de) * 1991-07-31 1993-02-04 Oertzen Arndt H Gmbh & Co Vorrichtung zum reinigen von rohrleitungen
WO1994021865A1 (fr) * 1993-03-23 1994-09-29 H.E.R.C. Incorporated Procede pour le nettoyage et l'entretien de systemes de conduites de distribution d'eau potable

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CN114713577A (zh) * 2022-04-25 2022-07-08 广东韶钢松山股份有限公司 一种煤气脱氨设备的清洗方法

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BR9505483A (pt) 1997-08-12
IL114194A0 (en) 1995-10-31
AU2828395A (en) 1996-01-15
EP0766765A1 (fr) 1997-04-09
CA2193494C (fr) 1999-12-07
CA2193494A1 (fr) 1995-12-28

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