CA2082837A1 - Methods of cleaning containers - Google Patents
Methods of cleaning containersInfo
- Publication number
- CA2082837A1 CA2082837A1 CA002082837A CA2082837A CA2082837A1 CA 2082837 A1 CA2082837 A1 CA 2082837A1 CA 002082837 A CA002082837 A CA 002082837A CA 2082837 A CA2082837 A CA 2082837A CA 2082837 A1 CA2082837 A1 CA 2082837A1
- Authority
- CA
- Canada
- Prior art keywords
- container
- carbon dioxide
- liquid carbon
- interior
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims description 14
- 238000004140 cleaning Methods 0.000 title claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 13
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 239000011236 particulate material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 235000011089 carbon dioxide Nutrition 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000012958 reprocessing Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 239000011538 cleaning material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0021—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by liquid gases or supercritical fluids
-
- 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
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Nozzles (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
91b145/PG
ABSTRACT
The interior of a compressed gas cylinder 5 is cleaned by passing cleanliquid carbon dioxide under pressure from a source tank 1 through nozzles 4' in a spray nozzle lance 4 located within the interior of the cylinder.
ABSTRACT
The interior of a compressed gas cylinder 5 is cleaned by passing cleanliquid carbon dioxide under pressure from a source tank 1 through nozzles 4' in a spray nozzle lance 4 located within the interior of the cylinder.
Description
HETBODS OF CLEANING CONrAINERS
The present invention relates to methods of cleaning the interior surface(s) of containers, for example, the interior surface(s) of cyli~ders which in use contain industrial, medical or other gases under press~lre.
Currently, gas cylinders are cleaned by flushing them with hot deionised water and a solvent such as FREON (Registered Trade Mark). This known method of cleaning gas cylinders suffers from the following disadvantages:
a) The method is relatively expensive; FREON is an expensive solvent;
b) the solvent should it escape is claimed to be damaging to the environment; and c) introducing hot de-ionised water into the cylinder necessitates a drying step.
It is an aim of the present invention to provide a method of cleaning the interior surface(s) of a container using clean liquid carbon dioxide under pressure.
According to the present invention, a method of cleaning the interior surface(s) of a container comprises passing clean liquid carbon dioxide under pressure through at least one nozzle located within the container.
An embodiment of the invention will now be described by way of example,reference being made to the Figure of the accompanying diagrammatic drawing which is a schematic diagram of an apparatus for use in cleaning the interior of a container.
As shown, a line 10 extends initially from a source tank 1 of liquid carbon dioxide to a pump 2 and a filter 3. From the filter 3 the line 10 joins a line 12 which is connected at its upper (as shown) end with the lower (as shown) end of a spray nozzle lance 4. The spray nozzle lance 4 .
The present invention relates to methods of cleaning the interior surface(s) of containers, for example, the interior surface(s) of cyli~ders which in use contain industrial, medical or other gases under press~lre.
Currently, gas cylinders are cleaned by flushing them with hot deionised water and a solvent such as FREON (Registered Trade Mark). This known method of cleaning gas cylinders suffers from the following disadvantages:
a) The method is relatively expensive; FREON is an expensive solvent;
b) the solvent should it escape is claimed to be damaging to the environment; and c) introducing hot de-ionised water into the cylinder necessitates a drying step.
It is an aim of the present invention to provide a method of cleaning the interior surface(s) of a container using clean liquid carbon dioxide under pressure.
According to the present invention, a method of cleaning the interior surface(s) of a container comprises passing clean liquid carbon dioxide under pressure through at least one nozzle located within the container.
An embodiment of the invention will now be described by way of example,reference being made to the Figure of the accompanying diagrammatic drawing which is a schematic diagram of an apparatus for use in cleaning the interior of a container.
As shown, a line 10 extends initially from a source tank 1 of liquid carbon dioxide to a pump 2 and a filter 3. From the filter 3 the line 10 joins a line 12 which is connected at its upper (as shown) end with the lower (as shown) end of a spray nozzle lance 4. The spray nozzle lance 4 .
is located within the interior of a container in the form of a compressed gas cylinder 5 and has a plurality of space nozzles 4' which extend along substantially the full length of the interior of the cylinder 5.
At its lower (as shown) end line 12 is connected to a line 13 in which is located a control valve 14.
Extending from the lower (as shown) end of the cylinder 5 is a further line 16 which communicates with a receiving tank 7. A pressure control device 6 is located within the line 16.
In use, initially the pressure within the cylinder is brought to about 40 bar by the slow introduction of nitrogen via line 13, valve 14, line 12 and the spray nozzle lance 4. The pressurisation of the cylinder 5 is intended to inhibit coating effects and the formation of dry ice.
Next, clean liquid carbon dioxide from tank 1 is pressurised by pump 2 and then passes through the filter 3 which removes any particulate material.
The filtered liquid carbon dioxide under pressure then passes into the spray nozzle lance 4 via the line 12 and is sprayed through the nozzles 4' to achieve a uniform liquid spray. The liquid spray velocity and the solvent properties of the liquid carbon dioxide remove impurities from the internal surface(s) of the cylinder 5.
Contaminated liquid carbon dioxide leaves the interior of the cylinder 5 via line 16 and is received within the tank 7 for recycling.
Although reference has been made throughout the above described embodiment to a compressed gas cylinder clearly the method described would be suitable for cleaning the interior of any container which may be contaminated by oil or particulate materials.
A particular advantage of the above described method is that any leakage of carbon dioxide will have minimal effect on the environment when compared to the solvents and other cleaning materials currently used for cleaning compressed gas cylinders.
.
At its lower (as shown) end line 12 is connected to a line 13 in which is located a control valve 14.
Extending from the lower (as shown) end of the cylinder 5 is a further line 16 which communicates with a receiving tank 7. A pressure control device 6 is located within the line 16.
In use, initially the pressure within the cylinder is brought to about 40 bar by the slow introduction of nitrogen via line 13, valve 14, line 12 and the spray nozzle lance 4. The pressurisation of the cylinder 5 is intended to inhibit coating effects and the formation of dry ice.
Next, clean liquid carbon dioxide from tank 1 is pressurised by pump 2 and then passes through the filter 3 which removes any particulate material.
The filtered liquid carbon dioxide under pressure then passes into the spray nozzle lance 4 via the line 12 and is sprayed through the nozzles 4' to achieve a uniform liquid spray. The liquid spray velocity and the solvent properties of the liquid carbon dioxide remove impurities from the internal surface(s) of the cylinder 5.
Contaminated liquid carbon dioxide leaves the interior of the cylinder 5 via line 16 and is received within the tank 7 for recycling.
Although reference has been made throughout the above described embodiment to a compressed gas cylinder clearly the method described would be suitable for cleaning the interior of any container which may be contaminated by oil or particulate materials.
A particular advantage of the above described method is that any leakage of carbon dioxide will have minimal effect on the environment when compared to the solvents and other cleaning materials currently used for cleaning compressed gas cylinders.
.
Claims (6)
1. A method of cleaning the interior surface(s) of a container comprising passing clean liquid carbon dioxide under pressure through at least one nozzle located within the container.
2. A method as claimed in Claim 1, in which the clean liquid carbon dioxide from a source is first pressurised and then passed through a filter to remove particulate material therefrom prior to its passage through the or each nozzle.
3. A method as claimed in Claim 1 or 2, in which a plurality of nozzles are located within the container, said nozzles being spaced apart and extending substantially along the full length of the container.
4. A method as claimed in any one of Claims 1 to 3, in which the interior of the container is slowly pressurised to approximately 40 bar to inhibit coating effects and the formation of dry ice prior to the introduction of the clean liquid carbon dioxide.
5. A method as claimed in any one of Claims 1 to 4, in which after passage through the or each nozzle liquid carbon dioxide is withdrawn from the container and collected for reprocessing.
6. A method of cleaning the interior of a container substantially as hereinbefore described.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9124186.9 | 1991-11-14 | ||
| GB9124186A GB2261364B (en) | 1991-11-14 | 1991-11-14 | Methods of cleaning containers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2082837A1 true CA2082837A1 (en) | 1993-05-15 |
Family
ID=10704616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002082837A Abandoned CA2082837A1 (en) | 1991-11-14 | 1992-11-13 | Methods of cleaning containers |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH05293456A (en) |
| AU (1) | AU2733392A (en) |
| CA (1) | CA2082837A1 (en) |
| GB (1) | GB2261364B (en) |
| ZA (1) | ZA928737B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5303837A (en) * | 1991-03-05 | 1994-04-19 | Portola Packaging, Inc. | One-piece fitment and plug with tamper-evident band |
| GB2358791A (en) | 2000-02-04 | 2001-08-08 | Versar Inc | Method composition and apparatus for cleaning internal surfaces of oxygen converters and cylinders |
| US6450182B2 (en) | 2000-04-12 | 2002-09-17 | Versar, Inc. | Methods, compositions and apparatus for cleaning pipes |
| DE10160902A1 (en) * | 2001-12-12 | 2003-07-03 | Messer Griesheim Gmbh | Highpressure cleaning by deepcooled gas has gas source and highpressure pump and iced particles admixer and cleaning and directing nozzle to spray jet effectively onto metal glass plastics or ceramics objects. |
| GB0218417D0 (en) * | 2002-08-08 | 2002-09-18 | Seagate Technology Llc | Combined atomic layer deposition and damascene processing for definition of narrow trenches |
| GB0329073D0 (en) * | 2003-12-13 | 2004-01-14 | Covelec Ltd | Cleaning apparatus |
-
1991
- 1991-11-14 GB GB9124186A patent/GB2261364B/en not_active Expired - Fee Related
-
1992
- 1992-10-26 AU AU27333/92A patent/AU2733392A/en not_active Abandoned
- 1992-11-05 JP JP4295729A patent/JPH05293456A/en active Pending
- 1992-11-12 ZA ZA928737A patent/ZA928737B/en unknown
- 1992-11-13 CA CA002082837A patent/CA2082837A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB2261364A (en) | 1993-05-19 |
| AU2733392A (en) | 1993-05-20 |
| GB2261364B (en) | 1995-04-19 |
| GB9124186D0 (en) | 1992-01-08 |
| ZA928737B (en) | 1993-07-28 |
| JPH05293456A (en) | 1993-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |