GB1558857A - Apparatus and method for extermally testing conduit connections - Google Patents
Apparatus and method for extermally testing conduit connections Download PDFInfo
- Publication number
- GB1558857A GB1558857A GB17546/77A GB1754677A GB1558857A GB 1558857 A GB1558857 A GB 1558857A GB 17546/77 A GB17546/77 A GB 17546/77A GB 1754677 A GB1754677 A GB 1754677A GB 1558857 A GB1558857 A GB 1558857A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ring
- test
- passageway
- flanges
- test ring
- 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
-
- 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
- G01M3/2861—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals for pipe sections by testing its exterior surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/167—Flanged joints characterised by the sealing means in connection with the appearance or detection of leaks
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Description
(54) APPARATUS AND METHOD FOR EXTERNALLY TESTING
CONDUIT CONNECTIONS
(71) We, EXXON PRODUCTION
RESEARCH COMPANY, a corporation duly organised and existing under the laws of the State of Delaware, United States of
America, of Houston, Texas, United States of America, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
Flanged or hubbed connections which connect together conduits for carrying fluids are conventionally tested by applying internal pressure to the seal elements and checking for signs of external leaks.However, it is often inconvenient, costly and/or impossible to perform such a test immediately after the connection is made, as for example, following installation of a pipeline riser or a subsea tie-in or a connection to a multiported vessel in offshore oil and gas drilling and production operations. It is advantageous to know that the ring gasket constituting the seal element in the connection has been properly installed and a sound seal obtained as soon as the connection is made.
The present invention permits evaluation of a seal in a flanged or hubbed connection between fluid carrying conduits through the application of external pressure to the seal immediately after the connection is made.
According to this invention a flanged connexion between fluid conductive conduits comprises two mateable flanges, each of which contains a circle of alignable bolt holes;
a seal ring for engaging the surfaces of and sealing off the spaces between said flanges to prevent flow of fluids into and from said conduits; and
a test ring for sealing off the spaces between said flanges, said test ring and said seal ring forming a one-piece unit, and a passageway for communicating fluid pressure to the engaging surfaces of said seal ring and flanges, said test ring having a greater diameter than that of said seal ring with the outside diameter of said test ring being substantially the same diameter as the inside diameter of said circle of bolt holes in said flanges.
The test ring and the seal ring form one unit and this may be accomplished by making them integral with one another or by attaching one to the other, e.g. by an adhesive. The exterior end of the passageway may be connected to a nipple which, in turn, is connected to the source of fluid pressure. When the passageway is formed in the test ring the nipple may also serve as a handle for inserting the unit into and removing the unit from the connection.
According to this invention a method of establishing a flanged connexion between fluid conducting conduits which can be tested for fluid-tightness, said connexion including two mateable flanges, each having a circle of alignable bolt holes comprises
inserting at least one bolt through at least one pair of aligned holes in said flanges;;
inserting test sealing apparatus between said flanges, said sealing apparatus including a seal ring for engaging the surfaces of and sealing off the spaces between said flanges to prevent flow of fluids into and from said conduits and a test ring, formed as a one-piece unit with said seal ring, for sealing off the spaces between said flanges, said test ring having a greater diameter than that of the seal ring with the outside diameter of said test ring being substantially the same diameter as the inside diameter of said circle of bolt holes in said flanges, there being a passageway for communicating fluid pressure to the engaging surfaces of said seal ring and flanges;;
manipulating said sealing apparatus, including pushing said sealing apparatus against said bolt, until the outside circumference of said test ring is positioned within the inside circumference of said circle of bolt holes;
inserting bolts through said remaining pairs of aligned bolt holes;
securing said flanges together:
applying fluid pressure of said passageway:
shutting off said fluid pressure: and thereafter measuring the fluid pressure in said passageway.
In conducting a test of the seal ring after the passageway is connected to the source of fluid pressure. fluid pressure is applied to the annular space between the seal ring and the test ring through the passageway to test the seal ring. After the test. the fluid pressure in the annular space is bled off and the fluid pressure source disconnected from the passageway.
The invention is now described with reference to the drawings in which only
Figures 6 to 9 illustrate the invention with the test ring formed as a one-piece unit with the seal ring. Figures 1 to 5 and 10 do not embody the invention but illustrate some modifications which can be applied to. or the method of use of, the apparatus illustrated in Figures 6 to 9.
Figure 1 illustrates a test ring having a pressure port therethrough arranged in a flanged connection and O-rings positioned on the test ring; Figure 9 is a view taken along lines 2-2 of
Figure 1: Figure 3 is a schematic illustration of a test apparatus assembly connected to the flanged connection of Figure 1;
Figure 4t is a view similar to Figure 2 illustrating severance of a portion of the nipple and its protector sleeve and plugging of the nipple; Figure 5 illustrates another arrangement in which the test ring of Figure 1 is arranged in a hubbed connection and O-rings are positioned on the hubs;;
Figures 6 and 7 illustrate side and top views. respectively, Figure 6 being partly in section. of the seal ring (gasket) and test ring of Figures 1 and 2 formed integrally:
Figures 8 and 9 illustrate side and top views, respectively, Figure 8 being partly in section. of the seal ring (gasket) and test ring of Figures 1 and 2 formed by gluing the test ring to the gasket; and
Figure 10 illustrates still another embodiment of the invention in which a test ring is arranged in a hubbed connection having a passageway therethrough.
Referring to Figures 1 and 2 there is shown a flanged connection or coupling l() having halves thereof bolted together by a series of studs 11 on which nuts 12 have been threaded. These studs are arranged in a circular pattern as shown in Figure 2. A gasket in the form of a metal seal ring 15 is positioned between the flange halves in circular grooves 16 formed in the faces of the flange halves. A metal test ring 20 is also positioned between the flange halves.Test ring 20 contains O-ring seals 21 and 22 arranged thereon to seal off the space between the flange half faces and test ring 20 to form a closed annular space 19 between outer diameter 15' of seal ring 15 and O-rings 21 and 22. The outer diameter 25 of test ring 20 is sized to fit inside the bolts in a bolted flange (or inside the clamp on a clamped hub connection as indicated in
Figure 5). Test ring thickness is machined to match the standard separation between flanges (or hubs) after the bolts (or clamps) are fully tightened. Test ring 20 contains a passageway 23 which opens into annular space 19. A nipple 24 (shown in Figure 1 sealingly threaded into the test ring) provides an extension 23' of passageway 23. A protector sleeve 26 surrounds a portion of nipple 24.A tubing connector fitting 27 is attached to the outer end of nipple 24 which protrudes between flange bolts 11, as shown. Nipple '4. together with protector sleeve 26, may serve as a handle to insert and arrange test ring 20 in and remove it from the connection.
As illustrated in Figure 3 fitting 27 is connected to a source of fluid under pressure 30 through a hose or conduit 31 in which is connected a valve 32 for controlling flow of pressure fluid through hose 31 and a pressure gauge 33 for measuring pressure in hose 31.
In the operation of the apparatus illustrated in Figures 1 and 2 ring gasket 15 and test ring 20 are installed between the faces of the flange halves 10, as shown, and the connection of the flange halves is made by tightening nuts 12 on studs 11. Fluid under pressure Is introduced into extension 23', passageway 23 and annular space 19 through hose 31 and open valve 32 from source 30 resulting in pressure buildup in annular space 19. Valve 32 is then closed trapping fluid pressure in annular space 19. If the seal formed by seal ring 15 is defective, fluid will leak from the annular space 19 and pressure in the annular space will fall and be so indicated on pressure gauge 33. However. if the seal is sound the pressure in the annular space will remain constant which also will be indicated on pressure gauge 33.
After the test has been completed fluid pressure in annular space 19 is bled off and hose 31 is disconnected. Nipple 24 may then be left intact to serve as a weep hole for long life leak monitoring or it may be cut off leaving the connection area uncluttered if that is desired.
As shown in Figure 4 a further alternative is to seal the nipple. The test nipple 24 and sleeve 26 are severed at the point they protrude from the flanges and nipple 24 is welded shut at the outer edge of the nipple protector sleeve 26 as shown by plug 40. In that manner a back-up resilient seal (the
O-rings) is provided for the seal effected by seal ring 15.
Should there be insufficient clearance between the flange or hub faces for the
O-ring grooves and the passageway, one or both of the O-rings may be installed in the flange or hub faces instead of in the test ring, as illustrated in Figure 5, or the passageway may be drilled through one of the flanges or hubs, as illustrated in Figure 10. Referring to Figure 5 there is shown a hubbed connection or coupling 45 having the halves thereof clamped together by clamp means 46. A double cone metal seal ring or gasket 47 seals off the connection. A metal test ring 48 is positioned between the faces of the hub halves. O-rings 49 and 50 are located in grooves formed in the faces of hub members 45 to seal off the space between those faces and test ring 48 to form an annular space 51 between gasket 47 and
O-rings 49 and 50.The test ring is provided with a passageway 52 which connects to annular space 51. A nipple 53 containing an extension 52' to passageway 52 is connected to test ring 48, as shown. Nipple 53 is protected by a sleeve 54 and is also provided with a connector fitting 54' which connects to a hose 31 in the same manner hose 31 is connected to connector fitting 37 as described with respect to Figures 1 and 2, above. The test operation is also the same as the test operation described with respect to those figures.
The seal ring which is manufactured integral with the test ring is illustrated in
Figures 6 and 7. When so made the combined gasket or seal ring and test ring 55 contains a passageway 56, in the test ring section 57 thereof, which is open to annular spaces 59, each formed by an undercut or recessed surface in member 55, located between the seal ring section 58 thereof and the O-ring seals, not shown. A nipple 60 is provided with a connection fitting 61 for hose 31 and an extension 56' of passageway 56. Nipple 60 is connected to section 57 and is surrounded by a nipple protector 62 in the same manner as is described above with respect to the embodiment of Figures 1 and 2.The integral test ring is particularly useful in subsea operations for the test ring section acts as a centralizing ring for the seal ring section making the task of locating the seal ring in grooves 16 of flanges 10, for example, (see Figure 1) extremely easy and minimizes the chances of damaging the seal ring. More specifically, the outside diameter of the test ring fits just inside the bolt circle of the flange connection. Thus, when three or four bolts have been installed in the connection, the combined test ring and the gasket are inserted together between the flanges or hubs and pushed against the bolts. This action automatically positions the gasket. Subsequent bolts cannot be installed unless the gasket (and test ring) are in proper position. This arrangement is particularly useful for making underwater connections where visibility is poor.
Also, the seal ring may be attached to the test ring by gluing one to the other with a resilient compound such as a silicon rubber adhesive. Such structure is illustrated in
Figures 8 and 9 where there is shown a seal ring 70 glued to a test ring 71 by adhesive material 72. Test ring 71 contains a passageway 73 which is connected to annular spaces 74 formed by undercutting or recessing test ring 71 adjacent to seal ring 70. As similarly disclosed in other Figures a nipple 75 provided with an extension 73 of passageway 73 and surrounded by a protective sleeve 76 welder thereto is threaded to test ring 71, as shown, and is provided with a suitable connection fitting 77.
The passageway may be drilled through one of the flanges or hubs instead of being provided in the test ring and the nipple "handle", when the latter is included. Referring to Figure 10 there is shown a hubbed connection or coupling 80 having halves thereof clamped together by clamp means 81. A double cone metal seal ring or gasket 82 seals off the connection. A metal test ring 83 is positioned between the faces of the hub halves. O-rings 84 and 85 are located in grooves formed in the faces of members 80 to seal off the space between the hub halve faces and test ring 83 to form an annular space 86 between gasket 82 and O-rings 84 and 85.The upper half of the hub halves 80 contains a passageway 87 which extends from annular space 86 to the exterior thereof and is connected to a conduit 88 (which may be a sleeve such as member 76 of Figure 8) which in turn is connected to a suitable source of fluid pressure 30 as illustrated in Figure 3.
It should be clear that when the seal ring and test ring are manufactured integral as illustrated in Figures 6 and 7 or are attached to each other by an adhesive as illustrated in
Figures 8 and 9 they may be used with either the hub type or flange type connection.
Also. the grooves for receiving the O-ring seals may be formed on the test ring or on the flange or hub members whether the test ring is attached to the seal ring or formed integral with the seal ring. In addition, the seal and test rings and other components while preferably made of metallic materials may be made of nonmetallic materials.
WHAT WE CLAIM IS:
1. A flanged connexion between fluid conductive conduits which comprises two
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (15)
1. A flanged connexion between fluid conductive conduits which comprises two
mateable flanges, each of which contains a circle of alignable bolt holes;
a seal ring for engaging the surfaces of and sealing off the spaces between said flanges to prevent flow of fluids into and from said conduits; and
a test ring for sealing off the spaces between said flanges, said test ring and said seal ring forming a one-piece unit, and a passageway for communicating fluid pressure to the engaging surfaces of said seal ring and flanges, said test ring having a greater diameter than that of said seal ring with the outside diameter of said test ring being substantially the same diameter as the inside diameter of said circle of bolt holes in said flanges.
2. A connexion as defined in claim 1 including means connected to said passageway for measuring fluid pressure in said passageway.
3. A connexion as defined in either of claims 1 and 2 including a circular groove formed in each flange for receiving said seal ring.
4. A connexion as defined in any one of the preceding claims including a nipple extending external of said connection and connected to said passageway.
5. A connexion as defined in any one of the preceding claims in which said test ring includes O-rings for sealing off the spaces between said flanges.
6. A connexion as defined in any one of the preceding claims in which said passageway extends through said test ring.
7. A connexion as defined in any one of claims 1 to 5 in which said passageway extends through one of said flanges.
8. A connexion as defined in any one of the preceding claims including a source of fluid pressure connected to said passageway for supplying fluid pressure thereto.
9. A method of establishing a flanged connexion between fluid conducting conduits which can be tested for fluid-tightness said connexion including two mate able flanges, each having a circle of alignable bolt holes which comprises
inserting at least one bolt through at least one pair of aligned holes in said flanges;;
inserting test sealing apparatus between said flanges, said sealing apparatus including a seal ring for engaging the surfaces of and sealing off the spaces between said flanges to prevent flow of fluids into and from said conduits and a test ring, formed as a one-piece unit with said seal ring, for sealing off the spaces between said flanges, said test ring having a greater diameter than that of the seal ring with the outside diameter of said test ring being substantially the same diameter as the inside diameter of said circle of bolt holes in said flanges, there being a passageway for communicating fluid pressure to the engaging surfaces of said seal ring and flanges;;
manipulating said sealing apparatus, including pushing said sealing apparatus against said bolt, until the outside circumference of said test ring is positioned within the inside circumference of said circle of bolt holes;
inserting bolts through said remaining pairs of aligned bolt holes;
securing said flanges together;
applying fluid pressure to said passageway;
shutting off said fluid pressure; and thereafter measuring the fluid pressure in said passageway.
10. A method as defined in claim 9 including inserting several bolts through pairs of aligned holes in said flanges prior to inserting said test sealing apparatus, the outside circumference of said test ring being positioned within the inside circumference of said bolt holes by pushing said sealing apparatus against said several inserted bolts.
11. A method as defined in either of claims 9 and 10 comprising releasing fluid pressure from said passageway.
12. A method as defined in any one of claims 9 to 11 in which said fluid pressure is applied through a passageway extending through said test ring.
13. A method as defined in any one of claims 9 to 11 in which said fluid pressure is applied through a passageway in one of said flanges.
14. A method as defined in either of claims 12 and 13 in which a nipple is connected to said passageway and including the steps of cutting off said nipple adjacent to the outer rim of said connection after releasing pressure from said passageway and then welding said nipple closed.
15. A flanged connection between fluid conductive conduits according to claim 1 substantially as hereinbefore described with reference to the drawings.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/652,969 US4019371A (en) | 1976-01-28 | 1976-01-28 | Apparatus and method for externally testing conduit connections |
| AU22577/77A AU501296B2 (en) | 1976-01-28 | 1977-02-23 | Externally testing conduit connections |
| GB17546/77A GB1558857A (en) | 1976-01-28 | 1977-04-27 | Apparatus and method for extermally testing conduit connections |
| US06/041,028 USRE30311E (en) | 1976-01-28 | 1979-05-21 | Apparatus and method for externally testing conduit connections |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/652,969 US4019371A (en) | 1976-01-28 | 1976-01-28 | Apparatus and method for externally testing conduit connections |
| GB17546/77A GB1558857A (en) | 1976-01-28 | 1977-04-27 | Apparatus and method for extermally testing conduit connections |
| US06/041,028 USRE30311E (en) | 1976-01-28 | 1979-05-21 | Apparatus and method for externally testing conduit connections |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1558857A true GB1558857A (en) | 1980-01-09 |
Family
ID=27257516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17546/77A Expired GB1558857A (en) | 1976-01-28 | 1977-04-27 | Apparatus and method for extermally testing conduit connections |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | USRE30311E (en) |
| AU (1) | AU501296B2 (en) |
| GB (1) | GB1558857A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2264760A (en) * | 1992-02-19 | 1993-09-08 | Seaboard Lloyd Ltd | Seal |
| GB2270767B (en) * | 1992-09-17 | 1995-11-01 | Texaco Ltd | Leak detection |
| GB2318845A (en) * | 1996-11-01 | 1998-05-06 | Cooper Cameron Corp | Tubular joint with sealing ring and secondary sealing |
| WO2002071022A1 (en) * | 2001-03-08 | 2002-09-12 | Ann Helen Hystad | Arrangement at a pipe flange seal |
| CN102435404A (en) * | 2011-09-22 | 2012-05-02 | 航天材料及工艺研究所 | Thermal vibration joint test device and method of flange sealing structure under complicated loaded conditions |
| CN104359635A (en) * | 2014-11-24 | 2015-02-18 | 中国航空动力机械研究所 | Multifunctional all-working-condition metal elastic sealing ring testing device |
| WO2015055985A1 (en) * | 2013-10-14 | 2015-04-23 | Edwards Limited | Vacuum system pipe couplings |
| GB2525991A (en) * | 2014-05-09 | 2015-11-11 | Klinger Ltd | Gasket assembly |
| USD753801S1 (en) | 2014-08-11 | 2016-04-12 | Klinger Ltd. | Seal |
| CN106066230A (en) * | 2016-06-14 | 2016-11-02 | 沈阳飞机工业（集团）有限公司 | A kind of multi-link ring flange exerciser and using method thereof |
| GB2538323A (en) * | 2015-05-15 | 2016-11-16 | Evenort Ltd | Mechanical seal assembly |
| CN108644499A (en) * | 2018-05-08 | 2018-10-12 | 胡振强 | Dredging pipe leakproof connection device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4888979A (en) * | 1989-02-15 | 1989-12-26 | The United States Department Of Energy | Leak detection aid |
| US6523394B2 (en) * | 2001-04-18 | 2003-02-25 | The United States Of America As Represented By The Secretary Of The Navy | Leak test fixture |
| US7814778B2 (en) * | 2008-01-24 | 2010-10-19 | Caterpillar Inc | Faceplate connection assembly and method |
| US8272444B2 (en) * | 2009-11-10 | 2012-09-25 | Benton Frederick Baugh | Method of testing a drilling riser connection |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2350867A (en) * | 1939-05-09 | 1944-06-06 | Cameron Iron Works Inc | Sealing and testing well head connections |
| US2460238A (en) * | 1944-09-18 | 1949-01-25 | Oil Ct Tool Company | Casing head |
| US2478628A (en) * | 1947-01-27 | 1949-08-09 | Shell Dev | Testing casing heads |
| GB854189A (en) * | 1957-01-29 | 1960-11-16 | Commissariat Energie Atomique | Improvements in or relating to joints for effecting the sealing of the connection between two piping elements |
| CH378112A (en) * | 1959-10-28 | 1964-05-31 | Gray Tool Co | Device for connecting two tubular elements |
-
1977
- 1977-02-23 AU AU22577/77A patent/AU501296B2/en not_active Expired
- 1977-04-27 GB GB17546/77A patent/GB1558857A/en not_active Expired
-
1979
- 1979-05-21 US US06/041,028 patent/USRE30311E/en not_active Expired - Lifetime
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2264760A (en) * | 1992-02-19 | 1993-09-08 | Seaboard Lloyd Ltd | Seal |
| GB2264760B (en) * | 1992-02-19 | 1995-06-14 | Seaboard Lloyd Ltd | Seal |
| GB2270767B (en) * | 1992-09-17 | 1995-11-01 | Texaco Ltd | Leak detection |
| GB2318845A (en) * | 1996-11-01 | 1998-05-06 | Cooper Cameron Corp | Tubular joint with sealing ring and secondary sealing |
| GB2318845B (en) * | 1996-11-01 | 2000-04-26 | Cooper Cameron Corp | Metal seal ring for tubular joint |
| WO2002071022A1 (en) * | 2001-03-08 | 2002-09-12 | Ann Helen Hystad | Arrangement at a pipe flange seal |
| US7004470B2 (en) | 2001-03-08 | 2006-02-28 | Ann Helen Hystad | Device for a pipe flange seal |
| CN102435404A (en) * | 2011-09-22 | 2012-05-02 | 航天材料及工艺研究所 | Thermal vibration joint test device and method of flange sealing structure under complicated loaded conditions |
| CN102435404B (en) * | 2011-09-22 | 2013-11-06 | 航天材料及工艺研究所 | Thermal vibration joint test device and method of flange sealing structure under complicated loaded conditions |
| WO2015055985A1 (en) * | 2013-10-14 | 2015-04-23 | Edwards Limited | Vacuum system pipe couplings |
| US10203054B2 (en) | 2013-10-14 | 2019-02-12 | Edwards Limited | Vacuum system pipe couplings |
| TWI653414B (en) | 2013-10-14 | 2019-03-11 | 愛德華有限公司 | Vacuum system pipe couplings, vacuum system, and method of protecting a seal system pipe coupling |
| GB2525991A (en) * | 2014-05-09 | 2015-11-11 | Klinger Ltd | Gasket assembly |
| GB2525991B (en) * | 2014-05-09 | 2016-09-21 | Klinger Ltd | Gasket assembly |
| USD753801S1 (en) | 2014-08-11 | 2016-04-12 | Klinger Ltd. | Seal |
| CN104359635A (en) * | 2014-11-24 | 2015-02-18 | 中国航空动力机械研究所 | Multifunctional all-working-condition metal elastic sealing ring testing device |
| GB2538323A (en) * | 2015-05-15 | 2016-11-16 | Evenort Ltd | Mechanical seal assembly |
| GB2538323B (en) * | 2015-05-15 | 2017-11-01 | Evenort Ltd | Mechanical seal assembly |
| US10591096B2 (en) | 2015-05-15 | 2020-03-17 | Evenort Ltd | Mechanical seal assembly |
| CN106066230A (en) * | 2016-06-14 | 2016-11-02 | 沈阳飞机工业（集团）有限公司 | A kind of multi-link ring flange exerciser and using method thereof |
| CN108644499A (en) * | 2018-05-08 | 2018-10-12 | 胡振强 | Dredging pipe leakproof connection device |
Also Published As
| Publication number | Publication date |
|---|---|
| AU501296B2 (en) | 1979-06-14 |
| USRE30311E (en) | 1980-06-24 |
| AU2257777A (en) | 1978-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |