WO1989009738A1 - A method of testing the joints for leaks in a thin plate lined storing room and a joint adapted to the performance of the method - Google Patents
A method of testing the joints for leaks in a thin plate lined storing room and a joint adapted to the performance of the method Download PDFInfo
- Publication number
- WO1989009738A1 WO1989009738A1 PCT/SE1989/000201 SE8900201W WO8909738A1 WO 1989009738 A1 WO1989009738 A1 WO 1989009738A1 SE 8900201 W SE8900201 W SE 8900201W WO 8909738 A1 WO8909738 A1 WO 8909738A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- joint
- fold
- testing
- folded
- folds
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/225—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for welds
Definitions
- the present invention relates to a method of testing the joints for leaks in a thin plate lined storing room, par ⁇ ticularly an underground storing room,-for a fluid, e.g. a gas or a liquid.
- the present invention also relates to a joint, which is adapted to the performance of the meth ⁇ od and provided between plates mutually connected in the thin plate lined storing room, which joint comprises an upright joint including edge folds of the edge portions of said plates mutually connected, which folds in an up ⁇ right position are turned towards the interior of said storing room, the interior sides of said folds which are turned towards to each other being mutually connected by means of a first welding seam as well as one of said folds projecting beyond the other one of said folds and being folded round the terminal edge of the other one of said folds.
- stainless thin plates be used to line storing rooms, particularly various types of un ⁇ derground cavities, used to store i.a. natural gas under a pressure as high as 150 bars.
- Other possible applications are storage of LPG, other gaseous hydrocarbons, such as ethylene, liquefied petroleum gas etc., other liquefied hydrocarbons, for which a fortified protection is a ne ⁇ cessity, such as jet fuel, lead-free gas etc., hydrogen gas, hot water, liquid ammonia, as well as various che ⁇ micals.
- Another field of application for the invention are thin plate lined, full hole-drilled tunnels designed for hot water distribution, as well as thin plate lined above- ground storing rooms.
- Stainless linings to be used in the above-mentioned app- lications are very thin, which results in problems as to the joining of the plates.
- the joints must meet exacting requirements. They must above all be leakproof and resist the pressure of the fluid being stored as well as defor ⁇ mations to a certain degree due to yieldings of the wall on the exterior side of the lining. Also, a joint which is easy to produce and to test for leaks is required. Al ⁇ so, it must be easy to make tight possibly detected leaks. Also, it ought to be possible to make tight points of in ⁇ tersection in a rational manner. Finally, it is desirable that the lining can be applied simultaneously with the production of the joints, i.e. during the same processes.
- Fig. 1 schematically illustrates the construction of the joint according to the present invention as well as how the lining is fastened to a support;
- Fig. 2 shows how a welding seam, which is a part of said joint and is leaking, can be repaired
- Fig. 3 shows a possible embodiment of a T-joint
- Fig. 4 shows how a joint can be tested for leaks accor ⁇ ding to the invention.
- FIG. 1 A description of a preferred embodiment In Fig. 1 two thin plates, 1 and 2, are shown and also a joint 3 according to a preferred embodiment of the inven ⁇ tion.
- the stainless lining of the preferred embodiment comprises said plates 1 and 2 and is made of a stainless austenitic steel having a thickness of 0.4 mm.
- a flat bar 5, used to fasten thin plates 1,2 to wall 4 is provided below joint 3 according to this embodiment, extends along the length of joint 3 and is fastened to concrete wall 4 by means of curved steel nails 6.
- Flat bar 5 can of course be fastened to concrete wall 4 in other ways, e.g. by means of glueing, casting etc .
- Joint 3 is designed as an upright joint directed towards said storing room. It comprises a first standing fold 7 on first plate 1 and a second standing fold 8 on second plate 2. Between said two folds 7 and 8 one leg 9 of an L-profile 14, thickness 0.15 mm, is positioned, the other leg 10 being welded to flat bar 5. The outer edge of said second fold 8 is designated 11. First fold 7 ex- tends beyond said outer edge 11 about 5 mm and is then folded 180°. The folded fold portion is designated 12.
- First and second folds 7 and 8 are joined by means of a first welding seam 13.
- the joint and standing leg 9 of L-profile 14 are also joined by means of this welding seam.
- Folded fold portion 12 and the exterior side of second fold 8 are joined by means of a second welding seam 16.
- Welding seams 13 and 16 are produced in the same process step. Welding seams 13,16 will not be loaded, when pressure is exerted on joint 3 by said fluid in said storing room, since said plates are folded inwards and the gas pressure compresses folds 7,8 against each other.
- a duct 17 is formed, designed for leak-testing by means of a detection fluid, preferab ⁇ ly for helium leak-testing.
- helium gas or another leak-testing fluid is introduced into duct 17.
- This tes ⁇ ting is performed in connection with the construction.
- the simplest method of detecting leaks is "sniffing", according to already known methods. This technique is illustrated in Fig. 4.
- an injection needle 30 is introduced into one end of said duct 17.
- duct 17 has been tho- roughly cleaned.
- fat or oil films must not be present in the gap, which is formed below said welding seam. Such films are removed by means of suitable solvents.
- injection needle 30 is introduced into duct 17.
- the outer diameter of the injection needle suitably is 1-1.5 mm.
- Said injection needle i.e. the injection needle tip, is inserted in said testing duct to roughly half its length and is fastened by means of several layers of a glue 31, which makes the opening of said duct completely tight around said injection needle.
- a similar injection needle 30' is inserted, which also is tightly glued in end 31' of said duct.
- a hose 32 for feeding helium gas or another leak-testing fluid and an extension 33 are used and cor ⁇ responding means 32' and 33' in said outlet end.
- Prior to testing the air in duct 17 must be removed, which can be done by blowing helium gas or a corresponding leak-tes- ting fluid having a suitable pressure into said duct, un ⁇ til this gas escapes through said outlet end.
- a few se ⁇ conds later said outlet end is closed by means of a hose clamp 34, subsequent to which the testing of the joint can be performed immediately.
- said outlet end can be closed from the beginning by means of a hose clamp 34.
- the air is removed - by means of a suction pump - through the inlet end, until a predeter ⁇ mined vacuum has been obtained, and subsequently helium gas or a similar leak-testing fluid having a suitable pres- -sure automatically fills said duct.
- the testing of the joint can subsequently be performed immediately.
- One of these two alternatives can be chosen according to the circumstances.
- the scanning is done continuously along joint 3 by means of a sniffer pistol 35.
- the tip of said sniffer pistol is held closely to said gap below welding seam 16.
- the scan ⁇ ning speed can be varied somewhat due to exterior circum ⁇ stances, but normally it stays in the interval 10-20 mm/s, A suitable gas pressure is 1 bar.
- a T-joint embodiment 24 is shown in Fig. 3.
- the folded fold portions 12 are in this instance cut off up to a few centimeters from the point of intersection.
- Welding seams 13 and 16 are turned upwards and make leak-testing duct 17 tight immediately in front of the cutting off-area. These portions of the welding seams are designated 13', 16' . From end points 26,27,28 of welding seams 13,16 and all the way up to said point of intersection 29 standing folds 7 and 8 are joined by means of icroTIG-welds.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8801380-0 | 1988-04-14 | ||
SE8801380A SE461974B (en) | 1988-04-14 | 1988-04-14 | SET AND JOINT BEFORE PERFORMING TEMPORARY CONTROL |
SE8801830A SE501360C2 (en) | 1988-04-14 | 1988-05-17 | Method and apparatus for protecting against dazzling light from vehicles, preferably during the dark hours of the day |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989009738A1 true WO1989009738A1 (en) | 1989-10-19 |
Family
ID=26660168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1989/000201 WO1989009738A1 (en) | 1988-04-14 | 1989-04-12 | A method of testing the joints for leaks in a thin plate lined storing room and a joint adapted to the performance of the method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0426675A1 (en) |
AU (1) | AU3418989A (en) |
SE (2) | SE461974B (en) |
WO (1) | WO1989009738A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999010721A1 (en) * | 1997-08-22 | 1999-03-04 | Caradon Stelrad Limited | Leak testing |
CN109297649A (en) * | 2018-11-28 | 2019-02-01 | 首都航天机械有限公司 | The device of the quick helium mass spectrum leak detection of circular joint in a kind of diaphragm |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE450941C (en) * | 1927-10-17 | Sulzer Akt Ges Geb | Sheet metal connection to enable leak tests | |
US2222079A (en) * | 1939-01-09 | 1940-11-19 | Smith Corp A O | Method of testing vessel liners |
FR868527A (en) * | 1939-07-08 | 1942-01-05 | Materiel Pour L Ind Du Petrole | Device for checking the tightness of riveted or welded seams made inaccessible by a coating |
GB1080043A (en) * | 1965-07-13 | 1967-08-23 | Conch Int Methane Ltd | Improvements in and relating to bulk storage tanks for liquids |
US3490268A (en) * | 1968-01-22 | 1970-01-20 | Us Navy | Nondestructive testing of hull stiffeners |
US3503111A (en) * | 1966-12-07 | 1970-03-31 | Mahon Technology Group | Industrial oven wall construction |
SE357440B (en) * | 1972-08-04 | 1973-06-25 | Nippon Kokan Kk |
-
1988
- 1988-04-14 SE SE8801380A patent/SE461974B/en not_active IP Right Cessation
- 1988-05-17 SE SE8801830A patent/SE501360C2/en unknown
-
1989
- 1989-04-12 WO PCT/SE1989/000201 patent/WO1989009738A1/en not_active Application Discontinuation
- 1989-04-12 EP EP89904641A patent/EP0426675A1/en not_active Withdrawn
- 1989-04-12 AU AU34189/89A patent/AU3418989A/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE450941C (en) * | 1927-10-17 | Sulzer Akt Ges Geb | Sheet metal connection to enable leak tests | |
US2222079A (en) * | 1939-01-09 | 1940-11-19 | Smith Corp A O | Method of testing vessel liners |
FR868527A (en) * | 1939-07-08 | 1942-01-05 | Materiel Pour L Ind Du Petrole | Device for checking the tightness of riveted or welded seams made inaccessible by a coating |
GB1080043A (en) * | 1965-07-13 | 1967-08-23 | Conch Int Methane Ltd | Improvements in and relating to bulk storage tanks for liquids |
US3503111A (en) * | 1966-12-07 | 1970-03-31 | Mahon Technology Group | Industrial oven wall construction |
US3490268A (en) * | 1968-01-22 | 1970-01-20 | Us Navy | Nondestructive testing of hull stiffeners |
SE357440B (en) * | 1972-08-04 | 1973-06-25 | Nippon Kokan Kk |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999010721A1 (en) * | 1997-08-22 | 1999-03-04 | Caradon Stelrad Limited | Leak testing |
CN109297649A (en) * | 2018-11-28 | 2019-02-01 | 首都航天机械有限公司 | The device of the quick helium mass spectrum leak detection of circular joint in a kind of diaphragm |
CN109297649B (en) * | 2018-11-28 | 2020-10-23 | 首都航天机械有限公司 | Device for quickly detecting leakage of inner circular welding seam of diaphragm by helium mass spectrometer |
Also Published As
Publication number | Publication date |
---|---|
SE501360C2 (en) | 1995-01-23 |
SE8801380D0 (en) | 1988-04-14 |
SE8801830L (en) | 1989-11-18 |
AU3418989A (en) | 1989-11-03 |
SE461974B (en) | 1990-04-23 |
SE8801830D0 (en) | 1988-05-17 |
EP0426675A1 (en) | 1991-05-15 |
SE8801380L (en) | 1989-10-15 |
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