GB2494614A - Seal ring and joint - Google Patents

Seal ring and joint Download PDF

Info

Publication number
GB2494614A
GB2494614A GB1113281.8A GB201113281A GB2494614A GB 2494614 A GB2494614 A GB 2494614A GB 201113281 A GB201113281 A GB 201113281A GB 2494614 A GB2494614 A GB 2494614A
Authority
GB
United Kingdom
Prior art keywords
text
hubs
annular sealing
pipeline
seal 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.)
Withdrawn
Application number
GB1113281.8A
Other versions
GB201113281D0 (en
Inventor
John Stobbart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Freudenberg Oil and Gas Technologies Ltd
Original Assignee
Vector International Ltd
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 Vector International Ltd filed Critical Vector International Ltd
Priority to GB1113281.8A priority Critical patent/GB2494614A/en
Publication of GB201113281D0 publication Critical patent/GB201113281D0/en
Priority to CA2785416A priority patent/CA2785416A1/en
Priority to AU2012101184A priority patent/AU2012101184A4/en
Publication of GB2494614A publication Critical patent/GB2494614A/en
Withdrawn legal-status Critical Current

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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
    • 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
    • F16L23/08—Flanged joints the flanges being connected by members tensioned in the radial plane connection by tangentially arranged pin and nut
    • 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

Abstract

A forged metal seal ring 1 of generally T-shaped cross section with the stem 14 of the à extending radially inwardly is adapted to fit around and in a recess between a pair of abutting or mating pipeline hubs or pipeline ends 2 and 3. It serves to align and abut the bores through said hubs or ends to eliminate or reduce leading edge erosion by fluids or fluent solids such as oil sands conveyed through the pipeline. Preferably it provides a metal to metal seal which may ne supplemented by O-ring seals in grooves 21, 22 in the hubs. The hubs may be pressed together by a multi-segment clamping ring 5 or the hubs could be provided with flanges bolted together by bolts which pass externally of the sea ring. The upstream hub may be provided with a chrome carbide overlay layer on internal surfaces.

Description

Seal ring and joint It is well imown that when conveying abrasive fluids or fluids containing solids through a metal pipe or pipeline comprising at least two joined sections, internal erosion occurs at the leading edge of any downstream section that is not correctly aligned with and immediately adjacent to a preceding upstream section. This can result in the need for frequent interruptions in the flow to allow sections to be replaced or repaired.
Metal oil and gas pipeline sections normally have flanged ends which are clamped or bolted together with at least one seal ring between them. A seal is necessary to prevent fluid leaking from the pipeline. Its inclusion however usually means that the flanged ends are not adjacent to each other. If such a pipeline is used to convey an abrasive fluid such as oil sands, leading edge erosion of the internal surfaces of flanges forming the upstream ends of each section would occur. It is known to provide a chrome carbide overlay layer on internal leading edge surfaces but relatively frequent replacement or repair would still be necessary. A metal seal ring which itself is exposed on the internal surface of the pipeline could be employed, but the seal ring would introduce a further leading edge, would be subject to abrasion by the fluid and may need to be replaced increasing costs.
Joints intended for use in the oil and gas industry are normally referred to as flanges and the flanged ends (which are usually welded to the pipeline sections) are normally referred to as hubs.
A first object of the present invention is to to provide a metal seal ring, which is adapted to align and provide a seal between a pair of abutting or mating pipeline hubs or pipeline ends, and which is not exposed in use to erosion by fluids or fluent solids conveyed through the pipeline.
A second object is to provide a pipeline joint including such a seal ring.
The present invention provides according to a first aspect an annular metal seal ring comprising a generally cylindrical portion having two generally conical inwardly facing surfaces which taper inwardly towards each other and on each of which at least one annular sealing portion is provided, and integrally formed with said generally cylindrical portion a radially inwardly extending annular web portion meeting said inner surface between two said annular sealing portions.
Preferably the seal ring is forged.
Preferably each annular sealing portion could comprise an annular sealing surface or an annular sealing lip.
The present invention farther provides according to a second aspect a pipeline joint comprising a seal ring according to a first aspect; a pair of pipeline hubs each having a generally conical outwardly hieing surface which is adapted to fit into and engage a respective said generally conical inwardly facing surface, each of said generally conical outwardly facing surfaces including at least one annular sealing region; and a clamping arrangement adapted to press said hubs towards each other.
Preferably each annular sealing region could comprise an 0-ring groove, an annular sealing surface or an annular sealing lip.
Preferably said clamping arrangement includes a multi-segment clamping ring which fits over and around said hubs.
Alternatively said clamping arrangement could comprise flange portions of said hubs, which portions protrude radially outwardly from said hubs beyond and on either side of said generally conical outwardly facing surfaces and are each provided with a plurality of apertures radially spaced sufficiently to allow the hubs to be bolted together by bolts passing said seal ring externally of its outer periphery.
The seal ring preferably provides a metal to metal seal between said hubs.
An exemplary embodiment of the present invention will now be described with reference to the accompanying drawings in which: Figure 1 is a perspective view of the components of ajoint in exploded form; Figure 2 is an end view of an assembled joint; Figure 3 is a side cross sectional view taken along the line S -S in Figure 2; Figure 4 shows part of Figure 3 in more detail; Figure 5 is a side view of the assembled joint; Figure 6 is a plan cross sectional view taken along the line V -V in Figure 5; and Figure 7 shows a possible modification.
As shown in exploded view in Figure 1 the main components of ajoint all of which are made of metal comprise a seal ring 1, a pair of hubs 2, 3 and a clamping arrangement 4 adapted to press said hubs towards each other. As shown the clamping arrangement comprises a pair of clamping segments 5 and 6 bolted together by studs 7 and nuts 8, the nuts preferably having spherical seats to allow greater angular movement of the segments during assembly of the joint.
In use the hubs would be welded to pipeline ends before the joint is assembled.
Figures 2 to 6 show an assembled joint including the seal ring 1, hubs 2 and 3, clamping segments 5 and 6, studs 7 and nuts 8 when tightened as in use. The hubs are provided with weld preps allowing them to be welded to pipeline sections prior to assembly.
Figure 2 is an end view of an assembled joint as viewed along the axis of a pipeline. The clamping segments may include lifting lugs 9.
Figure 3 shows a cross sectional view taken along the line S -S in Figure 2, allowing a typical cross section through the seal ring, hubs and clamp segments to be seen.
Figure 4 shows this cross section in more detail. The seal ring 1 comprises an integrally formed metal (typically forged steel or nickel alloy) annulus having a generally T-shaped cross section. It comprises a generally cylindrical portion having two generally conical inwardly facing surfaces 12, 13 which taper inwardly towards each other and a radially inwardly extending annular web portion 14 which meets said inner surface between two said annular sealing portions. The pipeline hubs 2 and 3 each have a flanged end 15, 16. Each flanged end includes a generally conical outwardly facing surface 17, 18 adapted to fit into and engage a respective said generally conical inwardly facing surface 12, 13 on the seal ring 1.
The clamping segments 5, 6 fit around and over the flanged ends and draw the hubs into engagement with each other in a manner well understood by one skilled in the art. The tapered surfaces ensure that the hubs are correctly aligned so that there are no leading edges to be eroded. The radially inwardly extending annular web portion 14 ensures that the seal ring fits equally over the hubs. The hubs are each provided with a peripheral recess 19, 20 into which the annular web portion 14 fits allowing the hubs to abut against each other with the seal ring in place.
The generally conical inwardly facing surfaces 12, 13 of the seal ring each include at least one annular sealing portion adapted to engage and form a seal with a corresponding annular sealing region on a generally conical outwardly facing surface 17 or 18 on the corresponding hub. The presence of the web also increases the contact pressures that can be applied between the sealing portions and the sealing regions. Each annular sealing portion could comprise an annular sealing surface or an annular sealing lip. Each annular sealing region could comprise an 0-ring groove, an annular sealing surface or an annular sealing lip. As shown the generally conical outwardly facing surface 17 or 18 on each hub includes an annular sealing region in the form of an 0-ring groove 21 or 22 into which an 0-ring fits as shown. The 0-ring engages an annular sealing surface on the corresponding generally conical inwardly facing surfaces 12 or 13 of the seal ring.
An annular sealing surface or an annular sealing lip could be provides in place of, or on either or both sides ofthe 0-ring groove. The (or each) annular sealing surface or lip is positioned to engage the (or a corresponding) annular sealing portion so as to provide a metal to metal seal between hubs.
Figure 7 shows a possible modification in which a chrome carbide overlay layer, comprising portions 30 and 31, is provided on the internal surface of hub 3 and on leading edge surface of a pipeline section 32 to which the hub 3 can be welded by virtue of weld prep 33.
A pair of mating hubs could be employed.
The present invention thus provides in one aspect a metal seal ring 1 adapted to fit around, align and provide a seal between a pair of abutting or mating pipeline hubs or pipeline ends. It is not exposed in use to erosion by fluids or fluent solids conveyed through the pipeline.
In the joint described above said clamping arrangement is a multi-segment clamping ring which fits over and around said hubs.
Alternatively in a modification not shown said clamping arrangement could comprise flange portions of said hubs, which portions protrude radially outwardly from said hubs beyond and on either side of said generally conical outwardly facing surfaces and are each provided with a plurality of apertures radially spaced sufficiently to allow the hubs to be bolted together by bolts passing said seal ring externally of its outer periphery.
The seal ring and hubs could be made from low temperature forged carbon steel.
The clamp segments could be made from ductile iron or austempered ductile iron.

Claims (1)

  1. <claim-text>Claims An annular metal seal ring comprising a generally cylindrical portion having two generally conical inwardly facing surfaces which taper inwardly towards each other and on each of which at least one annular sealing portion is provided, and integrally formed with said generally cylindrical portion a radially inwardly extending annular web portion meeting said inner surface between two said annular sealing portions.</claim-text> <claim-text>2. An annular metal sealring as claimed in claim 1, in which said seat ring is forged.</claim-text> <claim-text>3. An annular metal sealring as claimed in claim 1 or claim 2, in which each said annular sealing portion comprises an annular sealing surface or an annular sealing lip.</claim-text> <claim-text>4. A pipeline joint comprising a seal ring according to any preceding claim; a pair of pipeline hubs each having a generally conical outwardly facing surface which is adapted to fit into and engage a respective said generally conical inwardly facing surface, each of said generally conical outwardly facing surfaces including at least one annular sealing region; and a clamping arrangement adapted to press said hubs towards each other.</claim-text> <claim-text>5. A pipeline joint as claimed in claim 4, in which each said annular sealing region comprises an 0-ring groove, an annular sealing surface or an annular sealing lip.</claim-text> <claim-text>6. A pipeline joint as claimed in claim 4 or claim 5, in which said clamping arrangement includes a multi-segment clamping ring which fits over and around said hubs.</claim-text> <claim-text>7. A pipeline joint as claimed in claim 4 or claim 5, in which said clamping arrangement comprises flange portions of said hubs, which portions protrude radially outwardly from said hubs beyond and on either side of said generally conical outwardly facing surfaces and are each provided with a plurality of apertures radially spaced sufficiently to allow the hubs to be bolted together by bolts passing said seal ring externally of its outer periphery.</claim-text> <claim-text>8. A pipeline joint as claimed in any of claims 4 to 7, in which said seal ring provides a metal to metal seal between said hubs.</claim-text>
GB1113281.8A 2011-08-02 2011-08-02 Seal ring and joint Withdrawn GB2494614A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1113281.8A GB2494614A (en) 2011-08-02 2011-08-02 Seal ring and joint
CA2785416A CA2785416A1 (en) 2011-08-02 2012-08-01 Seal ring and joint
AU2012101184A AU2012101184A4 (en) 2011-08-02 2012-08-02 Seal ring and joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1113281.8A GB2494614A (en) 2011-08-02 2011-08-02 Seal ring and joint

Publications (2)

Publication Number Publication Date
GB201113281D0 GB201113281D0 (en) 2011-09-14
GB2494614A true GB2494614A (en) 2013-03-20

Family

ID=44676574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1113281.8A Withdrawn GB2494614A (en) 2011-08-02 2011-08-02 Seal ring and joint

Country Status (3)

Country Link
AU (1) AU2012101184A4 (en)
CA (1) CA2785416A1 (en)
GB (1) GB2494614A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103745756A (en) * 2013-12-23 2014-04-23 宁波天生密封件有限公司 Production process of O-shaped seal ring of nuclear reactor pressure vessel and products thereof
CN108709033A (en) * 2018-08-06 2018-10-26 常州奥特斯丹智能装备科技有限公司 Pipe flange
WO2021159188A1 (en) * 2020-02-13 2021-08-19 Odare Michael Collar assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163496A (en) * 1984-08-22 1986-02-26 Ksa Dichtsysteme A seal
US4909548A (en) * 1988-10-28 1990-03-20 Bas-Tex Corporation Compound-taper flange assembly
FR2708983A1 (en) * 1993-08-13 1995-02-17 Latty Int Sealing ring designed to be placed between two flanges
NL9500099A (en) * 1994-01-27 1995-09-01 Oostendorp Apparatenbouw B V Seal
DE202006017486U1 (en) * 2006-11-16 2007-03-08 Schuth, Horst Adjustable flange gasket for piping flange, has recess or chamfer at outer circulating area whereby separate tapered ring or O-ring is inserted into recess
FR2921142A1 (en) * 2007-09-18 2009-03-20 Clesse Ind Soc Par Actions Sim Sealing joint for connecting gas e.g. butane, distribution installation, has flexible ring jointly and concentrically mounted with hard ring and provided with sealing lips that axially extend beyond hard ring and on both sides of hard ring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163496A (en) * 1984-08-22 1986-02-26 Ksa Dichtsysteme A seal
US4909548A (en) * 1988-10-28 1990-03-20 Bas-Tex Corporation Compound-taper flange assembly
FR2708983A1 (en) * 1993-08-13 1995-02-17 Latty Int Sealing ring designed to be placed between two flanges
NL9500099A (en) * 1994-01-27 1995-09-01 Oostendorp Apparatenbouw B V Seal
DE202006017486U1 (en) * 2006-11-16 2007-03-08 Schuth, Horst Adjustable flange gasket for piping flange, has recess or chamfer at outer circulating area whereby separate tapered ring or O-ring is inserted into recess
FR2921142A1 (en) * 2007-09-18 2009-03-20 Clesse Ind Soc Par Actions Sim Sealing joint for connecting gas e.g. butane, distribution installation, has flexible ring jointly and concentrically mounted with hard ring and provided with sealing lips that axially extend beyond hard ring and on both sides of hard ring

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103745756A (en) * 2013-12-23 2014-04-23 宁波天生密封件有限公司 Production process of O-shaped seal ring of nuclear reactor pressure vessel and products thereof
CN108709033A (en) * 2018-08-06 2018-10-26 常州奥特斯丹智能装备科技有限公司 Pipe flange
WO2021159188A1 (en) * 2020-02-13 2021-08-19 Odare Michael Collar assembly
AU2021218693B2 (en) * 2020-02-13 2022-04-14 Innovation Logic Intellectual Property Pty Ltd Collar assembly

Also Published As

Publication number Publication date
CA2785416A1 (en) 2013-02-02
AU2012101184A4 (en) 2012-09-13
GB201113281D0 (en) 2011-09-14

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)