WO2015167343A1 - Clamp coupling device - Google Patents

Clamp coupling device Download PDF

Info

Publication number
WO2015167343A1
WO2015167343A1 PCT/NO2015/050072 NO2015050072W WO2015167343A1 WO 2015167343 A1 WO2015167343 A1 WO 2015167343A1 NO 2015050072 W NO2015050072 W NO 2015050072W WO 2015167343 A1 WO2015167343 A1 WO 2015167343A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupling
seal
sealing element
clamp
secondary seal
Prior art date
Application number
PCT/NO2015/050072
Other languages
French (fr)
Inventor
Morgan Haringstad
Original Assignee
Morgan Haringstad
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 Morgan Haringstad filed Critical Morgan Haringstad
Priority to GB1617910.3A priority Critical patent/GB2542040B/en
Publication of WO2015167343A1 publication Critical patent/WO2015167343A1/en

Links

Classifications

    • 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
    • F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
    • 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
    • F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
    • F16L23/20—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of metal
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
    • E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
    • 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
    • F16L23/04—Flanged joints the flanges being connected by members tensioned in the radial plane
    • 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
    • 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
    • G01M3/007—Leak detector calibration, standard leaks
    • 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
    • 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

Definitions

  • This invention relates to a clamp coupling. More particularly, it relates to a clamp coupling comprising two coupling halves, a sealing element and a clamp, in which, in the position of application, at least one primary seal and at least one secondary seal are arranged between the coupling halves and the sealing element, there being a test channel extending from between the primary seal and the secondary seal to the outside of the sealing element, and the secondary seal consists of a metal -to- metal seal.
  • the invention deals with a device making it possible to check more reliably that a pipe coupling of the clamp-coupling type is tight.
  • Clamp couplings of this kind are well known in the industry and are marketed by several suppliers.
  • Freudenberg Oil & Gas Technologies LTD, UK market the clamp coupling as Vector Tech I ok Clamp Connector, Graylock Products, TX, USA, market it as Clamp Connector, and Galperi Engineering, Italy, market it as G-lok.
  • GB952755A discloses a pipe coupling with a sealing element, which is placed between two flanges, including a first lip seal and a second seal which may be in the form of a plane sealing surface or a second lip seal. From the space between the primary and secondary seals, a channel extends through the sealing element to the outside of the element for leakage to be registered.
  • the sealing element is preferably formed out of metal.
  • DE202006002457U1 discloses a flange coupling with a sealing element including a primary seal, a secondary seal and a channel extending through the sealing element so that the space between the seals is connected to the surroundings.
  • the secondary seal consists of an element, which may be made of metal.
  • US4019371A discloses a clamp coupling with primary and secondary seals and a test channel.
  • the secondary seals consist of ordinary O-rings.
  • WO03027561A1 shows a flat sealing element between two flanges with a channel between the primary/secondary seals and the outside of the sealing element. Further gaskets are used on either side of the sealing element.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art.
  • a clamp-coupling device including two coupling halves, a sealing element and a clamp, and in which, in the position of application, at least one primary seal and at least one secondary seal are arranged between the coupling halves and the sealing element, there being a test channel extending from between the primary seal and the secondary seal to the outside of the sealing element, the clamp coupling being characterized by the secondary seal consisting of a metal-to- metal seal.
  • a metal -to- metal seal normally holds tight up to a substantially higher pressure than what can be achieved with, for example, simple O-ring seals and similar synthetic- material seals.
  • test clamp couplings up to the same test pressure as for the other components in, for example, a pipeline or a part of a processing plant.
  • the secondary seal may include an encircling ridge located on the sealing element. It is possible, of course, but probably not very practical, to arrange the ridges in the coupling faces of the coupling halves.
  • the ridges may have a profile of any suitable shape. Depending on the prevailing conditions and the choice of material, the ridges may have a curved profile or a sharp profile, for example.
  • the sealing element is formed out of one piece of material. In some conditions, the sealing element may be manufactured in multiple components.
  • the device according to the invention provides for a reliable testing of these much- used pipe couplings at the desired pressure and with the help of simple means.
  • the invention relates, more specifically, to a clamp-coupling device comprising two coupling halves, a sealing element and a clamp, in which, in the position of application, at least one primary seal and at least one secondary seal are arranged between the coupling halves and the sealing element, there being a test channel extending from between the primary seal and the secondary seal to the outside of the sealing element, and the secondary seal consists of a metal -to- metal seal, characterized by the secondary seal including several encircling ridges arranged outside each other in the radial direction.
  • the ridge may have a curved profile.
  • the ridge may have a sharp profile at its abutment against the coupling face.
  • Figure 1 shows a clamp coupling in a longitudinal section, during connection
  • Figure 2 shows the same as figure 1, but after the clamp coupling has been activated ;
  • Figure 3 shows the sealing element of the clamp coupling in perspective, on a somewhat larger scale
  • Figure 4 shows a section of a sealing element, on a larger scale
  • Figure 5 shows a section of figure 4 on yet another larger scale
  • Figure 6 shows the same as figure 5, but in another embodiment.
  • the reference numeral 1 indicates a clamp coupling which, in this embodiment, includes a first coupling half 2 and an identical second coupling half 4.
  • the coupling halves 2, 4 which are designed to be connected to adjacent pipes, not shown, are provided with coupling faces 6 facing each other in the position of application. On its inside, each of the coupling halves 2, 4 is formed with a conical sealing surface 8 projecting from the respective coupling face 6 and ending in a centric through-going opening 10 in the coupling half 2, 4. It can be mentioned that, for different purposes, the through-going opening 10 may be tight or be formed with a reduction, not shown, or some other flow-regulating function.
  • a clamp 12 encircles the coupling halves 2, 4.
  • the internal conical clamping faces 14 of the clamp 12 rest against the external conical faces 16 of the coupling halves 2, 4.
  • the coupling halves 2, 4 are brought together, see figure 2.
  • a sealing element 18 is placed between the coupling faces 6 of the coupling halves 2, 4.
  • the sealing element 18 includes an annular plate portion 20, which has a through- going opening 22. At the through-going opening 22, the plate portion 20 is provided with an annular projection 24 projecting in the axial direction on either side.
  • the projections 24 are formed with conical annular faces 26 complemen- tarily fitting the sealing surfaces 8 and forming the two primary seals 28 of the clamp coupling 1 in the position of application, see below.
  • the sealing element 18 is provided with preferably encircling or divided grooves 30. Typically, several grooves 30 are arranged outside each other, typically in a corrugation-like form.
  • ridges 32 have been formed, which, when they are drawn in against their respective coupling faces 6, form a metal -to- metal secondary seal 34.
  • the profile of grooves and ridges 32 may, for example, have a shape resembling a sine curve, as is shown in figure 5, a shape in which the ridges 32 have a sharper shape, as is indicated in figure 6, or another suitable shape, not shown.
  • the sealing element 18 is placed between the coupling halves 2, 4.
  • both conical faces 26 of the sealing element 18 have been brought in against their respective sealing surfaces 8.
  • the coupling faces 6 are drawn in against the plate portion 20 where the ridges 32 together with the coupling faces 6 form the secondary seal 34 of the clamp coupling 1, which is a metal -to- metal seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Clamps And Clips (AREA)
  • Gasket Seals (AREA)
  • Seal Device For Vehicle (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Vehicle Body Suspensions (AREA)
  • Cable Accessories (AREA)

Abstract

A clamp coupling device (1) comprising two coupling halves (2, 4), a sealing element (18) and a clamp (12), in which, in the position of application, at least one primary seal (18) and at least one secondary seal (34) are arranged between the coupling halves (2, 4) and the sealing element (18), there being a test channel (38) extending from between the primary seal (28) and the secondary seal (34) to the outside of the sealing element (18), and the secondary seal (34) consists of a metal-to-metal seal.

Description

CLAMP COUPLING DEVICE
This invention relates to a clamp coupling. More particularly, it relates to a clamp coupling comprising two coupling halves, a sealing element and a clamp, in which, in the position of application, at least one primary seal and at least one secondary seal are arranged between the coupling halves and the sealing element, there being a test channel extending from between the primary seal and the secondary seal to the outside of the sealing element, and the secondary seal consists of a metal -to- metal seal.
The invention deals with a device making it possible to check more reliably that a pipe coupling of the clamp-coupling type is tight.
Clamp couplings of this kind are well known in the industry and are marketed by several suppliers. Freudenberg Oil & Gas Technologies LTD, UK, market the clamp coupling as Vector Tech I ok Clamp Connector, Graylock Products, TX, USA, market it as Clamp Connector, and Galperi Engineering, Italy, market it as G-lok.
In particular after having fitted pipe couplings, but also during operation, it may be desirable to check that the clamp coupling is tight.
Freudenberg have developed a device for so-called "Reverse Integrity Testing", RIT, in which a pressure is applied between the primary seal of the coupling and a secondary seal for the primary seal to be tested. See http ^/vvwvv,vectO:ta reversed":ntegre!:v-- testing/. However, the Freudenberg RIT tool is of such a design that the pressure resistance of the secondary seal will not always be sufficient for tests to be carried out at the desired pressure.
GB952755A discloses a pipe coupling with a sealing element, which is placed between two flanges, including a first lip seal and a second seal which may be in the form of a plane sealing surface or a second lip seal. From the space between the primary and secondary seals, a channel extends through the sealing element to the outside of the element for leakage to be registered. The sealing element is preferably formed out of metal. DE202006002457U1 discloses a flange coupling with a sealing element including a primary seal, a secondary seal and a channel extending through the sealing element so that the space between the seals is connected to the surroundings. The secondary seal consists of an element, which may be made of metal.
US4019371A discloses a clamp coupling with primary and secondary seals and a test channel. The secondary seals consist of ordinary O-rings.
WO03027561A1 shows a flat sealing element between two flanges with a channel between the primary/secondary seals and the outside of the sealing element. Further gaskets are used on either side of the sealing element.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art.
The object is achieved according to the invention through the features that are specified in the description below and in the claims that follow.
A clamp-coupling device is provided, the clamp coupling including two coupling halves, a sealing element and a clamp, and in which, in the position of application, at least one primary seal and at least one secondary seal are arranged between the coupling halves and the sealing element, there being a test channel extending from between the primary seal and the secondary seal to the outside of the sealing element, the clamp coupling being characterized by the secondary seal consisting of a metal-to- metal seal.
A metal -to- metal seal normally holds tight up to a substantially higher pressure than what can be achieved with, for example, simple O-ring seals and similar synthetic- material seals.
It is therefore possible by means of the invention to test clamp couplings up to the same test pressure as for the other components in, for example, a pipeline or a part of a processing plant.
The secondary seal may include an encircling ridge located on the sealing element. It is possible, of course, but probably not very practical, to arrange the ridges in the coupling faces of the coupling halves.
It is usually beneficial to arrange several ridges outside each other in the radial direction. It is thereby achieved that the secondary seal is further secured against leakage. At their abutments against the coupling face, the ridges may have a profile of any suitable shape. Depending on the prevailing conditions and the choice of material, the ridges may have a curved profile or a sharp profile, for example.
Normally, the sealing element is formed out of one piece of material. In some conditions, the sealing element may be manufactured in multiple components.
The device according to the invention provides for a reliable testing of these much- used pipe couplings at the desired pressure and with the help of simple means.
The invention is defined by the independent claim. The dependent claims define advantageous embodiments of the invention.
The invention relates, more specifically, to a clamp-coupling device comprising two coupling halves, a sealing element and a clamp, in which, in the position of application, at least one primary seal and at least one secondary seal are arranged between the coupling halves and the sealing element, there being a test channel extending from between the primary seal and the secondary seal to the outside of the sealing element, and the secondary seal consists of a metal -to- metal seal, characterized by the secondary seal including several encircling ridges arranged outside each other in the radial direction.
At its abutment against the coupling face, the ridge may have a curved profile. Alternatively, the ridge may have a sharp profile at its abutment against the coupling face.
In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which :
Figure 1 shows a clamp coupling in a longitudinal section, during connection;
Figure 2 shows the same as figure 1, but after the clamp coupling has been activated ;
Figure 3 shows the sealing element of the clamp coupling in perspective, on a somewhat larger scale;
Figure 4 shows a section of a sealing element, on a larger scale;
Figure 5 shows a section of figure 4 on yet another larger scale; and
Figure 6 shows the same as figure 5, but in another embodiment. In the drawings the reference numeral 1 indicates a clamp coupling which, in this embodiment, includes a first coupling half 2 and an identical second coupling half 4.
The coupling halves 2, 4 which are designed to be connected to adjacent pipes, not shown, are provided with coupling faces 6 facing each other in the position of application. On its inside, each of the coupling halves 2, 4 is formed with a conical sealing surface 8 projecting from the respective coupling face 6 and ending in a centric through-going opening 10 in the coupling half 2, 4. It can be mentioned that, for different purposes, the through-going opening 10 may be tight or be formed with a reduction, not shown, or some other flow-regulating function.
A clamp 12 encircles the coupling halves 2, 4. The internal conical clamping faces 14 of the clamp 12 rest against the external conical faces 16 of the coupling halves 2, 4. As the clamp 12 is drawn together radially, the coupling halves 2, 4 are brought together, see figure 2.
A sealing element 18 is placed between the coupling faces 6 of the coupling halves 2, 4.
The sealing element 18 includes an annular plate portion 20, which has a through- going opening 22. At the through-going opening 22, the plate portion 20 is provided with an annular projection 24 projecting in the axial direction on either side.
Externally, the projections 24 are formed with conical annular faces 26 complemen- tarily fitting the sealing surfaces 8 and forming the two primary seals 28 of the clamp coupling 1 in the position of application, see below.
On the sides of the plate portion 20 facing the coupling faces 6 in the position of application, the sealing element 18 is provided with preferably encircling or divided grooves 30. Typically, several grooves 30 are arranged outside each other, typically in a corrugation-like form.
Between the grooves 30 and possibly beside the grooves 30, ridges 32 have been formed, which, when they are drawn in against their respective coupling faces 6, form a metal -to- metal secondary seal 34. The profile of grooves and ridges 32 may, for example, have a shape resembling a sine curve, as is shown in figure 5, a shape in which the ridges 32 have a sharper shape, as is indicated in figure 6, or another suitable shape, not shown.
An annular recess 36 on either side of the plate portion 20, between the annular faces 26 and the grooves 30, constitutes a test groove, which communicates, by means of a test channel 38, with the radial outside of the sealing element 18, where it may be connected to suitable test equipment, not shown.
When the clamp coupling 1 is arranged in the way shown in figure 1 and ready to be connected, the sealing element 18 is placed between the coupling halves 2, 4. Preferably, both conical faces 26 of the sealing element 18 have been brought in against their respective sealing surfaces 8.
When the clamp 12 is placed with its internal clamping faces 14 resting against the coupling halves 2, 4 and then tightened radially along the conical faces 16, the two coupling halves 2, 4 are moved towards each other while each annular face 26 is moved in, under radial, elastic deformation, against its respective sealing surface 8. This tightening makes each annular face 26 together with the sealing surface 8 form a reliable primary seal 28.
The coupling faces 6 are drawn in against the plate portion 20 where the ridges 32 together with the coupling faces 6 form the secondary seal 34 of the clamp coupling 1, which is a metal -to- metal seal.
By pressurizing the area between the primary seal 28 and the secondary seal 34 the integrity of the primary seal 28 may be tested at relatively high pressure.

Claims

C l a i m s
A clamp coupling device (1) comprising two coupling halves (2, 4), a sealing element (18) and a clamp (12), in which, in the position of application, at least one primary seal (28) and at least one secondary seal (34) are arranged between the coupling halves (2, 4) and the sealing element (18), there being a test channel (38) extending from between the primary seal (28) and the secondary seal (34) to the outside of the sealing element (18), and the secondary seal (34) consists of a metal -to- metal seal, c h a r a c t e r i z e d i n that the secondary seal (34) includes several encircling ridges (32) arranged outside each other in the radial direction.
The device according to claim 1, c h a r a c t e r i z e d i n that at their abutment against the coupling face (6), the ridges (32) have a curved profile.
The device according to claim 1, c h a r a c t e r i z e d i n that at their abutment against the coupling face (6), the ridges (32) have a sharp profile.
PCT/NO2015/050072 2014-04-30 2015-04-23 Clamp coupling device WO2015167343A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1617910.3A GB2542040B (en) 2014-04-30 2015-04-23 Clamp coupling device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20140560A NO337569B1 (en) 2014-04-30 2014-04-30 Device by clamping coupling
NO20140560 2014-04-30

Publications (1)

Publication Number Publication Date
WO2015167343A1 true WO2015167343A1 (en) 2015-11-05

Family

ID=54358948

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2015/050072 WO2015167343A1 (en) 2014-04-30 2015-04-23 Clamp coupling device

Country Status (3)

Country Link
GB (1) GB2542040B (en)
NO (1) NO337569B1 (en)
WO (1) WO2015167343A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105334000A (en) * 2015-12-08 2016-02-17 天津博益气动股份有限公司 Laminar flow tube identifying system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB952755A (en) * 1959-10-28 1964-03-18 Gray Tool Co Improved coupling for fluid pressure duct
US4019371A (en) * 1976-01-28 1977-04-26 Exxon Production Research Company Apparatus and method for externally testing conduit connections
WO2003027561A1 (en) * 2001-09-26 2003-04-03 Ann Helen Hystad An arrangement for monitoring and/or testing of flange joints
DE202006002457U1 (en) * 2006-02-16 2006-05-11 Höcketstaller, Gerhard Flange connections and/or shaft feedthrough sealing device for e.g. chemical industry, has secondary seal attached outside primary seal, and chamber created in flange or outside of flange, where leakage is collected in chamber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB952755A (en) * 1959-10-28 1964-03-18 Gray Tool Co Improved coupling for fluid pressure duct
US4019371A (en) * 1976-01-28 1977-04-26 Exxon Production Research Company Apparatus and method for externally testing conduit connections
WO2003027561A1 (en) * 2001-09-26 2003-04-03 Ann Helen Hystad An arrangement for monitoring and/or testing of flange joints
DE202006002457U1 (en) * 2006-02-16 2006-05-11 Höcketstaller, Gerhard Flange connections and/or shaft feedthrough sealing device for e.g. chemical industry, has secondary seal attached outside primary seal, and chamber created in flange or outside of flange, where leakage is collected in chamber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105334000A (en) * 2015-12-08 2016-02-17 天津博益气动股份有限公司 Laminar flow tube identifying system

Also Published As

Publication number Publication date
NO20140560A1 (en) 2015-11-02
NO337569B1 (en) 2016-05-09
GB201617910D0 (en) 2016-12-07
GB2542040A (en) 2017-03-08
GB2542040B (en) 2020-07-22

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