CA1219407A - Method for cleaning the inside of metal tubing - Google Patents
Method for cleaning the inside of metal tubingInfo
- Publication number
- CA1219407A CA1219407A CA000421218A CA421218A CA1219407A CA 1219407 A CA1219407 A CA 1219407A CA 000421218 A CA000421218 A CA 000421218A CA 421218 A CA421218 A CA 421218A CA 1219407 A CA1219407 A CA 1219407A
- Authority
- CA
- Canada
- Prior art keywords
- tubing
- plug
- cleaning fluid
- pressure
- cleaning
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
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
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
- B08B9/0552—Spherically shaped pigs
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The inside of coiled metal tubing is cleaned by introducing cleaning fluid from one end into the tubing and propelling a plug, preferably a slightly oversized felt plug under pressure, through the tubing to drive the cleaning fluid through the tubing leaving only a very small liquid film remaining on the inside surface which will soon evaporate after the source of pressure has been removed and the plug has been ejected from the other end of the tubing.
The inside of coiled metal tubing is cleaned by introducing cleaning fluid from one end into the tubing and propelling a plug, preferably a slightly oversized felt plug under pressure, through the tubing to drive the cleaning fluid through the tubing leaving only a very small liquid film remaining on the inside surface which will soon evaporate after the source of pressure has been removed and the plug has been ejected from the other end of the tubing.
Description
The present invention relates to the cleaning of the inside or inside surface of coiled metal tubing utilizing a liquid cleaning medium, preferably an organic cleaning fluid, which is introduced into the tubing, followed by evaporation of the medium which adheres to the tube's surface.
There has been a longstanding problem due to the fact that copper tubes corrode as a result of the depositing of carbon or carbon compounds on the inside surface of the tubing. This is particularly true in those cases in which tubing is utilized in the sanitation field. The carbon film or coating results, for exampleg from the thermal decomposition of a medium which has been used during drawing of the tube to a smaller diameter. In the case of tubing formed from soft material which has been soft annealed following the last drawing step, such decomposition products are produced during the annealing step. But even in the case of hard tubes which have not been annealed, such a potentially damaging carbon film may be produced, for example, upon brazing two lengths of tubes together and/or for example, when heating the tubing to facilitate bending thereof. It has been found that the carbon film produced as a result of such a heating process is virtually innocuous if less than .1 milligrams per dm square of grease is found on the inner surface of the tubing.
In order to remove a solid film of any kind from the inside surface of a tube, it has been suggested to employ a degreasing medium such as perchloroethylene or trichloroethylene and to cause a certain quantity of such a medium to be moved through a coil of tubing by, for example, rotating the entire coil. Subsequently, hot air is circulated through the tubing in order to evaporate any remaining degreasing medium and to thereby dry the surface of the tubing. While this method provides efficient degreasing, it is very expensive because it is a rather slow procedure which greatly ~,s harms the speed of production.
In accordance with another prior proposal, steam is introduced into the tubing, i.e. water vapor, to which a certain amount of degreasing medium has been added. This addition may be made several times during the procedure.
It has been found, however, that by means oE this method the thickness of any remaining degreasedlayer can be reduced to below the dangerous level only if this particular method is repeatedly applied. ~eedless to say, this proposal is quite uneconomical.
It is an object of the present invention to provide a new and im-proved method for cleaning the inside surface of coiled metal tubing in a manner which is more economical than the practices which have been used in the past.
It is another object of the invention to provide a new and improved method of reducing grease deposits on the inside of coiled metal tubing to an amount of less than .1 milligrams grease per dm square (or 10 milligrams per square meter).
The method of the invention may be generally defined as introducing into coiled tubing from one end thereof a cleaning fluid, introducing at one end of the tubing a plug having an outer diameter approximately equal to the inner diameter of the tubing, and moving the plug by means of externally applied pressure through the entire tube length so that this plug element drives the cleaning medium through the tubing. After the foregoing procedure, the pressure in the tubing is reduced, whereupon any cleaning fluid still resident in the tube can evaporate.
When practising the invention, one needs only three to five liters of cleaning fluid to clean a length of tubing of about 1000 meters. It is important that the speed with which the plug is propelled through the tubing be sufficiently high that the cleaning fluid will cover the entire surfaceof the tubing. As the plug emerges from the other end of the tubing, the pressure source is removed and the internal pressure is gradually reduced.
In case the tubing is subsequently to be used for household purposes, one has to consider the fact that the grease solvent, such as perchloroethylene or trichloroethylene are poisonous. In such cases, the plug may be propelled through the tubing by, for example, pressurized ni-trogen, and the vapor emerging from the other end of the tubing should be sucked out of the tubing instead of merely relying on the reduction of pressure which occurs at the end where the plug was initially inserted.
It was found that the tubing is very satisfactorily degreased. The high degree of effectiveness is believed to be attributable to the speed with which the cleaning fluid is forced along the inner wall surface, causing turbulence within the fluid which flushes grease out of even the minutest pores in a surface of the tubing. Moreover, the plug is propelled through the tubing with little or no play so that the remaining cleaning fluid film is very thin. This, in turn, means that the amount of liquid remaining is very thin. After evaporation, the residual solid deposit layer amounts to less than 0.1 milligram per dm square, thus meeting the desideratum of the invention.
It can readily be seen that it is important that the residual liquid film should be very thin. For this reason it was found to be advantageous to employ a plug which is porous, in the sense that it is provided with many small capillary ducts. A felt plug has, for example been found to be very suitable. Such a plug may have a larger diameter than the interior diameter of the tubing before being introduced into the tubing. When the plug is forced into the tubing it is slightly compressed. As the felt plug engages the cleaning fluid, the plug will be penetrated by the fluid. In view of the originally larger diameter, the plug will intensively clean the inner surface of the tubing and the resulting remaining cleaning fluid film should be very thin. Moreover, it has been found advantageous to have the length to diameter ratio of such a felt plug between :L.l and 2Ø
It is a feature of the invention that the desired degree of cleaning can be achieved in single stage, i.e. without repeating the filling and evacuating steps. While single stage treatment normally suffices, the stages can be repeated where the cleaning requirements are particularly stringent.
If they are required, the repeated stages can be carried out in immediate sequence. The first cleaning step may be provided as described above, and without using additional cleaning fluid~ one may simply force a second (but dry) plug through the tubing. This dry plug will wipe substantially all the cleaning fluid film off the inside surface of the tubing so that the then remaining cleaning fluid film will be so thin that the amount of grease re-maining in the tubing is negligible.
Surprisingly, it has been found that the method of the invention is advantageous from an additional point of view. Certain copper specks and particles of dirt may have remained in the tubing after the last drawing step. These specks and particles will be removed by the procedures described above.
While the specification concludes with claims, particularly pointing out and distinctly claiming the subject matter which is regarded as the invention, it is believed that the invention and its objects, features and advantages will be better understood from the following description taken in connection with the accompanying drawing, which is a somewhat schematic illustration of the invention.
The drawing shows a coil 1 of copper tubing 2 having an outer diameter of 15 millimeters and a wall thickness of about 1 millimeter, the inner diameter of the tubing being about 13 millimeters. The entire tubing within the coil 1 has a length of about 1,000 meters. In order to practise the invention, liquid cleaning fluid, for example, 5 liters of pure tri-chloroethylene, is filled from a tank 3 into one end, for example the end 4, of the tubing 2, whereupon that end is closed by means of a felt plug 5.
The felt plug 5 has an outer diameter of about 14 millimeters so that, when the plug has been introduced into the tubing, the plug is slightly compressed.
A source 6 of nitrogen, controlled by means of a valve 7, is then connected to end 4 of the tubing 2, and the valve 7 is opened. The source 6 may be a nitrogen bottle or the like containing nitrogen under a pressure of, for example, 20 bars.
As soon as the valve 7 is opened, the nitrogen emerges from the bottle 6 and propels the plug 5 through the coil 1. With the above-described dimensions, it was found that the speed of the plug through the tubing is about 6 to 7 meters per second. The plug 5 drives the 5 liters of cleaning fluid in front of it, whereby of course a minor pressure reduction occurs and a small amount of liquid remains deposited on the tube wall through which the plug has just passed. The speed of the liquid through the tubing is such that turbulence is set up and a thorough flushing and cleaning action occurs throughout the entire coiled tubing 2.
Cleaning fluid will emerge from the end 8 of the tubing, followed by the plug 5. At this point, the entire tubing will be filled with fairly highly pressurized nitrogen. Upon removal of the bottle 6 from the end 4, the nitrogen can discharge from the tubing at both ends 4 and 8. It was found that the liquid cleaning fluid that remained as a film will evaporate quickly, and, after about 2 minutes, the nitrogen together with evaporated cleaning fluid, will have left the tubing, leaving the tubing completely dry.
The cleaning process can be carried further by flushing the entire tubing through with nitrogen so that all vestiges of the cleaning fluid are removed.
The coil is subsequently uncoiled, straightened, and cut into desired lengths for further usage.
Tests have yielded the following results. Typically, a tube of the type described above had, before the treatment, a grease content on the inner surface of about 5 milligrams per dm square. After practising the cleaning method described above, the grease content was reduced to 0.06 milligrams per dm square, which is well below the tolerable limit. Moreover, it was sig-nificant that this extremely low grease content and grease deposit on the inner surface varies very little over the entire length of the tube length.
The preferred pressurized medium is nitrogen. Onc can9 however,also use pressurized air, but if air is used care must be taken that the air does not contain any grease.
The invention is not limited to the embodiments described above.
All changes and modifications thereof, not constituting departures from the spirit and scope of the invention, are intended to be covered by the appended claims.
There has been a longstanding problem due to the fact that copper tubes corrode as a result of the depositing of carbon or carbon compounds on the inside surface of the tubing. This is particularly true in those cases in which tubing is utilized in the sanitation field. The carbon film or coating results, for exampleg from the thermal decomposition of a medium which has been used during drawing of the tube to a smaller diameter. In the case of tubing formed from soft material which has been soft annealed following the last drawing step, such decomposition products are produced during the annealing step. But even in the case of hard tubes which have not been annealed, such a potentially damaging carbon film may be produced, for example, upon brazing two lengths of tubes together and/or for example, when heating the tubing to facilitate bending thereof. It has been found that the carbon film produced as a result of such a heating process is virtually innocuous if less than .1 milligrams per dm square of grease is found on the inner surface of the tubing.
In order to remove a solid film of any kind from the inside surface of a tube, it has been suggested to employ a degreasing medium such as perchloroethylene or trichloroethylene and to cause a certain quantity of such a medium to be moved through a coil of tubing by, for example, rotating the entire coil. Subsequently, hot air is circulated through the tubing in order to evaporate any remaining degreasing medium and to thereby dry the surface of the tubing. While this method provides efficient degreasing, it is very expensive because it is a rather slow procedure which greatly ~,s harms the speed of production.
In accordance with another prior proposal, steam is introduced into the tubing, i.e. water vapor, to which a certain amount of degreasing medium has been added. This addition may be made several times during the procedure.
It has been found, however, that by means oE this method the thickness of any remaining degreasedlayer can be reduced to below the dangerous level only if this particular method is repeatedly applied. ~eedless to say, this proposal is quite uneconomical.
It is an object of the present invention to provide a new and im-proved method for cleaning the inside surface of coiled metal tubing in a manner which is more economical than the practices which have been used in the past.
It is another object of the invention to provide a new and improved method of reducing grease deposits on the inside of coiled metal tubing to an amount of less than .1 milligrams grease per dm square (or 10 milligrams per square meter).
The method of the invention may be generally defined as introducing into coiled tubing from one end thereof a cleaning fluid, introducing at one end of the tubing a plug having an outer diameter approximately equal to the inner diameter of the tubing, and moving the plug by means of externally applied pressure through the entire tube length so that this plug element drives the cleaning medium through the tubing. After the foregoing procedure, the pressure in the tubing is reduced, whereupon any cleaning fluid still resident in the tube can evaporate.
When practising the invention, one needs only three to five liters of cleaning fluid to clean a length of tubing of about 1000 meters. It is important that the speed with which the plug is propelled through the tubing be sufficiently high that the cleaning fluid will cover the entire surfaceof the tubing. As the plug emerges from the other end of the tubing, the pressure source is removed and the internal pressure is gradually reduced.
In case the tubing is subsequently to be used for household purposes, one has to consider the fact that the grease solvent, such as perchloroethylene or trichloroethylene are poisonous. In such cases, the plug may be propelled through the tubing by, for example, pressurized ni-trogen, and the vapor emerging from the other end of the tubing should be sucked out of the tubing instead of merely relying on the reduction of pressure which occurs at the end where the plug was initially inserted.
It was found that the tubing is very satisfactorily degreased. The high degree of effectiveness is believed to be attributable to the speed with which the cleaning fluid is forced along the inner wall surface, causing turbulence within the fluid which flushes grease out of even the minutest pores in a surface of the tubing. Moreover, the plug is propelled through the tubing with little or no play so that the remaining cleaning fluid film is very thin. This, in turn, means that the amount of liquid remaining is very thin. After evaporation, the residual solid deposit layer amounts to less than 0.1 milligram per dm square, thus meeting the desideratum of the invention.
It can readily be seen that it is important that the residual liquid film should be very thin. For this reason it was found to be advantageous to employ a plug which is porous, in the sense that it is provided with many small capillary ducts. A felt plug has, for example been found to be very suitable. Such a plug may have a larger diameter than the interior diameter of the tubing before being introduced into the tubing. When the plug is forced into the tubing it is slightly compressed. As the felt plug engages the cleaning fluid, the plug will be penetrated by the fluid. In view of the originally larger diameter, the plug will intensively clean the inner surface of the tubing and the resulting remaining cleaning fluid film should be very thin. Moreover, it has been found advantageous to have the length to diameter ratio of such a felt plug between :L.l and 2Ø
It is a feature of the invention that the desired degree of cleaning can be achieved in single stage, i.e. without repeating the filling and evacuating steps. While single stage treatment normally suffices, the stages can be repeated where the cleaning requirements are particularly stringent.
If they are required, the repeated stages can be carried out in immediate sequence. The first cleaning step may be provided as described above, and without using additional cleaning fluid~ one may simply force a second (but dry) plug through the tubing. This dry plug will wipe substantially all the cleaning fluid film off the inside surface of the tubing so that the then remaining cleaning fluid film will be so thin that the amount of grease re-maining in the tubing is negligible.
Surprisingly, it has been found that the method of the invention is advantageous from an additional point of view. Certain copper specks and particles of dirt may have remained in the tubing after the last drawing step. These specks and particles will be removed by the procedures described above.
While the specification concludes with claims, particularly pointing out and distinctly claiming the subject matter which is regarded as the invention, it is believed that the invention and its objects, features and advantages will be better understood from the following description taken in connection with the accompanying drawing, which is a somewhat schematic illustration of the invention.
The drawing shows a coil 1 of copper tubing 2 having an outer diameter of 15 millimeters and a wall thickness of about 1 millimeter, the inner diameter of the tubing being about 13 millimeters. The entire tubing within the coil 1 has a length of about 1,000 meters. In order to practise the invention, liquid cleaning fluid, for example, 5 liters of pure tri-chloroethylene, is filled from a tank 3 into one end, for example the end 4, of the tubing 2, whereupon that end is closed by means of a felt plug 5.
The felt plug 5 has an outer diameter of about 14 millimeters so that, when the plug has been introduced into the tubing, the plug is slightly compressed.
A source 6 of nitrogen, controlled by means of a valve 7, is then connected to end 4 of the tubing 2, and the valve 7 is opened. The source 6 may be a nitrogen bottle or the like containing nitrogen under a pressure of, for example, 20 bars.
As soon as the valve 7 is opened, the nitrogen emerges from the bottle 6 and propels the plug 5 through the coil 1. With the above-described dimensions, it was found that the speed of the plug through the tubing is about 6 to 7 meters per second. The plug 5 drives the 5 liters of cleaning fluid in front of it, whereby of course a minor pressure reduction occurs and a small amount of liquid remains deposited on the tube wall through which the plug has just passed. The speed of the liquid through the tubing is such that turbulence is set up and a thorough flushing and cleaning action occurs throughout the entire coiled tubing 2.
Cleaning fluid will emerge from the end 8 of the tubing, followed by the plug 5. At this point, the entire tubing will be filled with fairly highly pressurized nitrogen. Upon removal of the bottle 6 from the end 4, the nitrogen can discharge from the tubing at both ends 4 and 8. It was found that the liquid cleaning fluid that remained as a film will evaporate quickly, and, after about 2 minutes, the nitrogen together with evaporated cleaning fluid, will have left the tubing, leaving the tubing completely dry.
The cleaning process can be carried further by flushing the entire tubing through with nitrogen so that all vestiges of the cleaning fluid are removed.
The coil is subsequently uncoiled, straightened, and cut into desired lengths for further usage.
Tests have yielded the following results. Typically, a tube of the type described above had, before the treatment, a grease content on the inner surface of about 5 milligrams per dm square. After practising the cleaning method described above, the grease content was reduced to 0.06 milligrams per dm square, which is well below the tolerable limit. Moreover, it was sig-nificant that this extremely low grease content and grease deposit on the inner surface varies very little over the entire length of the tube length.
The preferred pressurized medium is nitrogen. Onc can9 however,also use pressurized air, but if air is used care must be taken that the air does not contain any grease.
The invention is not limited to the embodiments described above.
All changes and modifications thereof, not constituting departures from the spirit and scope of the invention, are intended to be covered by the appended claims.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of degreasing the inside surface of coiled metal tubing comprising the steps of introducing a particular quantity of cleans-ing fluid into the tubing from one end thereof, the quantity being very small in relation to the volume of the tubing; closing that one end with a capillary, oversized, compressible and compressed plug which is movable in the tubing; applying a source of pressure to said one end to thereby propel the plug under pressure for generating a turbulent flow of cleansing fluid, through the entire length of the tubing until the plug emerges from the other end; and causing the pressure in the tubing to be reduced whereby residual cleaning fluid that remained deposited on the inside wall of the tubing will evaporate.
2. A method as defined in Claim 1, wherein the plug is formed of felt.
3. A method as defined in Claim 1, or 2, wherein the plug has a length to diameter ratio of from about 1.1 to 2Ø
4. A method as defined in Claim 1, or 2, including the additional step of subsequently propelling another felt plug through the tubing under pressure.
5. A method as defined in Claim 1, or 2, wherein the pressure is sufficient to propel the plug at a speed which will cause turbulence in the cleaning fluid as it moved through the coil by the plug.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823207135 DE3207135A1 (en) | 1982-02-27 | 1982-02-27 | METHOD FOR CLEANING THE INSIDE SURFACE OF METAL TUBES IN RING SHAPE |
| DEP3207135.3 | 1982-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1219407A true CA1219407A (en) | 1987-03-24 |
Family
ID=6156891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421218A Expired CA1219407A (en) | 1982-02-27 | 1983-02-09 | Method for cleaning the inside of metal tubing |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS58153788A (en) |
| AT (1) | AT376461B (en) |
| BE (1) | BE896008A (en) |
| CA (1) | CA1219407A (en) |
| CH (1) | CH659660A5 (en) |
| DD (1) | DD207554A5 (en) |
| DE (1) | DE3207135A1 (en) |
| ES (1) | ES518351A0 (en) |
| FI (1) | FI72755C (en) |
| FR (1) | FR2522286B1 (en) |
| GB (1) | GB2116284B (en) |
| GR (1) | GR76740B (en) |
| IT (1) | IT1153562B (en) |
| MX (1) | MX160594A (en) |
| NL (1) | NL191794C (en) |
| PL (1) | PL240767A1 (en) |
| SE (1) | SE501882C2 (en) |
| YU (1) | YU44377B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4818298A (en) * | 1985-08-16 | 1989-04-04 | Trest "Juzhvodoprovod" | Method of removing deposits from the inside walls of a pipeline and applying protective coatings thereto |
| US5354152A (en) * | 1990-07-06 | 1994-10-11 | Eolas - The Irish Science And Technology Agency | Method and apparatus for conveying ice lumps |
| AU1756397A (en) * | 1996-01-29 | 1997-08-20 | Servend International, Inc. | Ice transportation system and method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR385465A (en) * | 1907-12-21 | 1908-05-13 | Columbus Elek Zitaets Ges M B | Device for cleaning the inside of pipes |
| US2906650A (en) * | 1956-10-31 | 1959-09-29 | Roll Dippers Inc | Method of cleaning pipe lines |
| AT211180B (en) * | 1957-11-07 | 1960-09-26 | Wiberg Berger & Co | Method and device for cleaning liquid lines |
| US3108012A (en) * | 1960-07-20 | 1963-10-22 | Pipelife Corp | Method of conditioning transmission lines in situ |
| US3731701A (en) * | 1970-07-25 | 1973-05-08 | Suzuei Co Ltd | Separator for forcing fluids by pipeline |
| DE2337022A1 (en) * | 1973-07-20 | 1975-02-13 | Liege Usines Cuivre Zinc | Removing drawing lubricants from copper tubes before annealing - by alternately blowing into the bores a degreasant and steam |
| DD110672A1 (en) * | 1974-03-20 | 1975-01-05 | ||
| US4216026A (en) * | 1979-02-05 | 1980-08-05 | Shell Oil Company | System for removing fluid and debris from pipelines |
-
1982
- 1982-02-27 DE DE19823207135 patent/DE3207135A1/en active Granted
- 1982-07-19 FR FR8212591A patent/FR2522286B1/en not_active Expired
- 1982-08-23 CH CH4997/82A patent/CH659660A5/en not_active IP Right Cessation
- 1982-08-26 AT AT0322182A patent/AT376461B/en not_active IP Right Cessation
- 1982-08-30 IT IT23029/82A patent/IT1153562B/en active
- 1982-12-03 FI FI824181A patent/FI72755C/en not_active IP Right Cessation
- 1982-12-08 GR GR70015A patent/GR76740B/el unknown
- 1982-12-17 ES ES518351A patent/ES518351A0/en active Granted
- 1982-12-22 JP JP57224097A patent/JPS58153788A/en active Granted
-
1983
- 1983-02-09 CA CA000421218A patent/CA1219407A/en not_active Expired
- 1983-02-14 NL NL8300545A patent/NL191794C/en not_active IP Right Cessation
- 1983-02-14 YU YU335/83A patent/YU44377B/en unknown
- 1983-02-24 PL PL24076783A patent/PL240767A1/en unknown
- 1983-02-24 BE BE0/210197A patent/BE896008A/en not_active IP Right Cessation
- 1983-02-24 DD DD83248236A patent/DD207554A5/en not_active IP Right Cessation
- 1983-02-25 MX MX196399A patent/MX160594A/en unknown
- 1983-02-25 GB GB08305255A patent/GB2116284B/en not_active Expired
- 1983-02-25 SE SE8301050A patent/SE501882C2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE501882C2 (en) | 1995-06-12 |
| IT1153562B (en) | 1987-01-14 |
| ES8402885A1 (en) | 1984-03-01 |
| NL8300545A (en) | 1983-09-16 |
| PL240767A1 (en) | 1983-10-10 |
| FR2522286B1 (en) | 1987-01-30 |
| ES518351A0 (en) | 1984-03-01 |
| DE3207135C2 (en) | 1991-12-12 |
| IT8223029A0 (en) | 1982-08-30 |
| GR76740B (en) | 1984-08-30 |
| DD207554A5 (en) | 1984-03-07 |
| NL191794C (en) | 1996-08-02 |
| SE8301050D0 (en) | 1983-02-25 |
| FI824181L (en) | 1983-08-28 |
| FI824181A0 (en) | 1982-12-03 |
| AT376461B (en) | 1984-11-26 |
| SE8301050L (en) | 1983-08-28 |
| FR2522286A1 (en) | 1983-09-02 |
| CH659660A5 (en) | 1987-02-13 |
| ATA322182A (en) | 1984-04-15 |
| YU33583A (en) | 1986-12-31 |
| YU44377B (en) | 1990-06-30 |
| NL191794B (en) | 1996-04-01 |
| MX160594A (en) | 1990-03-27 |
| GB2116284B (en) | 1985-02-27 |
| FI72755B (en) | 1987-03-31 |
| GB8305255D0 (en) | 1983-03-30 |
| GB2116284A (en) | 1983-09-21 |
| DE3207135A1 (en) | 1983-09-08 |
| JPS58153788A (en) | 1983-09-12 |
| JPH0420997B2 (en) | 1992-04-07 |
| FI72755C (en) | 1987-07-10 |
| BE896008A (en) | 1983-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE60016133T2 (en) | Method of removing surface contamination | |
| US5137581A (en) | Degreasing and cleaning method as well as apparatus used therefor | |
| US6783601B2 (en) | Method for removing particles and non-volatile residue from an object | |
| CA1219407A (en) | Method for cleaning the inside of metal tubing | |
| US5817585A (en) | Paint and stain remover in an abrasive applicator for hard surfaces | |
| EP0158566B1 (en) | Process for eliminating deposits in a steam generator of a nuclear pressurized water reactor | |
| US3276694A (en) | Apparatus for cleaning the interior surfaces of enclosures | |
| US3297481A (en) | Cleaning and descaling process | |
| DE4142358C2 (en) | Degreasing cleaning process | |
| US5993561A (en) | Process for cleaning paint residues from surfaces | |
| DE69503230T2 (en) | CLEANING THE ELECTRON CANNON FROM CATHODE RAY TUBES BY CARBON DIOXIDE SNOW | |
| AU600689B2 (en) | Process for cleaning aluminum | |
| US1687102A (en) | Method of treating the internal and external surfaces of elongated bodies | |
| JP2001181874A (en) | Degreasing and cleaning method and cleaner | |
| JPH11250744A (en) | Rustproof processing method for conductor for outdoor distribution line | |
| JPH07506626A (en) | Method and apparatus for forming coatings by deposition on internal surfaces of tanks and pipe equipment | |
| JPH05263280A (en) | Method for washing metallic surface of constitution apparatus used for treatment of organic effluent | |
| WO1991008583A1 (en) | Washing system | |
| JP2580459Y2 (en) | Spray fluxer | |
| JPH09316670A (en) | Rust prevention treatment for copper or copper alloy material | |
| RU2191079C2 (en) | Method of surface cleaning from contaminations | |
| JPH08364Y2 (en) | Metal tube surface treatment equipment | |
| DE2320729C3 (en) | Process for cleaning mineral surfaces of buildings, streets or the like. with the help of water | |
| JPH06280072A (en) | Device for degreasing-cleaning continuous material | |
| CA2343670A1 (en) | Method of cleaning an ozone generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |