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
  • F16L17/00—Joints with packing adapted to sealing by fluid pressure
  • F16L17/10—Joints with packing adapted to sealing by fluid pressure the packing being sealed by the pressure of a fluid other than the fluid in or surrounding the pipe
• • 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
  • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
  • F16L39/04—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies allowing adjustment or movement
• • 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
  • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
  • F16L39/06—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies of the multiline swivel type, e.g. comprising a plurality of axially mounted modules

Definitions

• the present invention relates to a fluid flow connector, particularly for high pressure applications.
• Such connectors are needed for example in transferring oil or gas from offshore drilling installations onto transport or storage vessels.
• the connectors may be a part of floating buoys carrying a riser from an undersea extraction point to which an oil tanker links up to load the oil or gas.
• the connector may be fixed on the deck of the transport vessel. It is also possible for one part of the connector to be normally carried on the vessel and to be releasably connected at appropriate times to the other part in the floating buoy.
• Relative movement between the parts of the connector is important for such applications to allow for relative movement of the vessel and the riser in strong winds, high waves or influential currents.
• a relative rotational capability is particularly advantageous and the connector may form a swivel joint between conduits.
• a swivel joint presents difficulties with regard to ensuring correct and accurate alignment of the ends of corresponding fluid conduits and in sealing the conduit join against leakage.
• One such flow connector is known from US 4 828 292 and comprises two concentric hollow cylindrical parts, relatively rotatable with respect to each other and having cooperating aligned annular grooves to form circumferential passages within the connector, delimited by the inner walls of the two cylindrical parts.
• Inlet and outlet pipes are welded to the inner or outer cylindrical parts as appropriate and connect with the annular circumferential passages. In this way, even with rotational movement of the two parts, the inlet and outlet pipes communicate at all times via the annular passages.
• Annular ring seals are incorporated on each side of the passages and may be pressurised by a barrier fluid.
• the present invention provides an arrangement for connecting conduits carrying high pressure production fluid so as to allow for relative movement between two members carrying respective connecting ends of the conduits, wherein: one of the connecting members comprises a central core having a plurality of bores formed longitudinally therein, and a plurality of passages formed radially of the core, each radial passage communicating with a respective longitudinal bore, the arrangement comprising: a plurality of annular passages formed between the connecting members, each annular passage providing a fluid flow path to respective radial passages in the central core, and means for sealing the or each annular passage against leakage of the high pressure production fluid, the sealing means including a sealing member activated by differential pressure and a supply of a barrier fluid to the side of the sealing member which is remote from the production fluid flow.
• An arrangement according to the invention is more versatile and more reliable than known connectors.
• one side of the sealing member is subject to the pressure of the high pressure production fluid flowing in the conduits and the other side of the seal is subject to the barrier fluid which is supplied at a higher pressure than that of the production fluid flowing in the conduits.
• additional environment seals are provided in the region of the top and bottom of the central core.
• the longitudinal bores may be formed in a ring in the core and two such bores can be fluidly connected to each radial passage.
• the arrangement preferably uses a sealing arrangement as described and illustrated in applicant's co-pending simultaneously filed application entitled “Sealing Arrangement” and bearing the reference FD37/PL77262GB.
• a particularly preferred embodiment of the present invention provides an inner and an outer core element having independent bores formed in respective elements, the inner element extending longitudinally beyond the outer core element and connecting with another female connecting member of a smaller diameter to the female connecting member for the outer core.
• Another embodiment of the present invention provides a large diameter lower male connector and a small diameter upper male connector which can be stacked onto the larcre diameter connector.
• the lower, large diameter connector has a hollow central section though which pipes are inserted to connect with the bores in the upper, small diameter, connector. This embodiment saves material, and is thus less expensive.
• Male connectors of different diameters can easily be stacked on top of each other to provide a modularised design or the connectors can be used independently depending on the need of a particular project.
• Figure 1 shows one embodiment of a fluid connector according to the present invention in cross- sectional and in elevational view.
• Figure 2 is a cross section through the fluid connector of Figure 1 illustrating one example of an arrangement of bores in the central core.
• Figure 3 is a part cross-sectional view of a second embodiment of a fluid connector according to the present invention.
• Figure 4 is a cross-section through the fluid connector of Figure 3 along line IV-IV.
• Figure 5 is a cross-sectional view of a third embodiment of a fluid connector according to the present invention.
• Figure 6 is an enlarged view of part of Figure 5.
• Figure 1 illustrates a high pressure fluid connector.
• a cross-sectional view is shown in the left half of the Figure.
• oppositely directed cross-hatching is used to indicate parts of the connector which are relatively rotational with respect to each other.
• a male member 1 is denoted by a left to right rising cross-hatching
• a female member 2 is denoted by left to right falling cross-hatching.
• the male member 1 is generally held stationary, for example on a storage or transport vessel to which the oil or gas is being pumped through the connector.
• the male core member 1 has several axial bores 31 connecting radial passageways 32 in core element 1 to fluid conduits 33 in the female member 2. The junction of these fluid conduits with the radial passageways 32 in male member
• Such a sealing arrangement comprises double pairs of lip-seals each having U-shaped cross-sections and being activated by a high pressure barrier fluid applied to the open side of the sealing ring.
• the barrier fluid is supplied at a higher pressure CD the pressure cf the production fluid in the conduit and provides a lubrication for the seal, to facilitate relative rotation of the members 1 and 2 without damage to the seal .
• an environment seal 34, 35 which seals a set of fluid carrying conduits against the environment (which will usually but not necessarily exclusively be at atmospheric pressure) .
• the environment seal comprises a pair of spaced U-shaped seals activated by pressure differentials.
• the core element 1 comprises an additional extension portion 38 extending longitudinally above female member 2, and having a smaller diameter.
• This extension 38 connects with a second female member 39 in 'the same way as has been described in relation to the first female member 2 and the main part of the core member 1. That is to say that sealing arrangements 37 as well as environment seal 34, 35 are provided.
• Such a narrower diameter core extension is useful for particularly high pressure fluid flow.
• the core extension 38 may be formed as a separate inner core element which fits coaxially into the outer core element 1.
• Figure 2 is a cross-section of Figure 1 showing axially bores 31 arranged in concentric rings.
• the outer ring of bores 31 connect two at a time to radial passageways 32.
• An inner ring of axial bores 31a each connect a respective radial passageway 32a.
• a central axial bore 40 in core 1 carries electrical wires 41 (Figure 1) and/or other support lines and power supplies for the connector and the pipeline.
• Figure 3 shows an alternative arrangement to that of Figure 1 where the arrangement is identical except that the male core member 1 is formed of an inner core member 42 and an outer core member 43. All other components are denoted by like reference numbers. Using a male core member which is sectioned in this way is advantageous since it allows for easier manufacture of the connector.
• Figure 4 is a cross-section along line IV-IV in Figure 3. This clearly shows the axial conduits 31 in the outer core 43 communicating in pairs with radial passageways 32.
• the inner core member 42 has axial bores 31a of a smaller diameter to those in the outer core element. These bores 31a communicate for fluid connection in pairs with radial passageways 32a. Each set of axial bores is arranged in a ring.
• the central bore 40 is provided to carry power supply lines or other services.
• Figure 5 shows a lower, large diameter male connector 56 with an upper small diameter connector 57 stacked on top, each having a hollow central portion 59.
• Each of these male connectors (56,57) has longitudinal bores for fluid transport which connect with respective radial passageways, annular grooves and conduits in co ⁇ operating female members, as has been described with reference to the Figures 1 and 3 above.
• the bores and passageways of lower connector 56 are not shown in Figure 5.
• the bores 31 of the upper connector 57 connect to pipes 58 which are located in the hollow central part 59 of lower connector 56.
• Seals 60 are arranged at the junction of bores 31 and pipes 58 and these may be of any of a variety of known constructions.
• the upper connector 57 also has a hollow central part 61.
• the upper and lower connectors 56,57 each have a solid core surrounding their hollow centres, through which the longitudinal bores are drilled for transport of fluid.
• the upper and lower male connectors each have separate co-operating female connectors.
• the lower female connector is not shown but the upper one is indicated at 62.
• the junction of the fluid carrying conduits between the male and female parts is sealed in a similar way to the system described for the embodiments of Figures 1 and 3, and is also described in applicant's co-pending and simultaneously filed application number 95 22 326.9 entitled "Sealing Arrangement".
• Figure 5 a different arrangement of the parts is used and this is illustrated in larger scale in Figure 6 which is a cross-section through a part of one fluid conduit junction.
• annular grooves 3 in the embodiment of Figure 5 are formed between the female mamber 2 and key pieces 63 which are bolted to the core of male member 57 by bolts 64. This makes the male member 57 simpler to construct and the tolerances required for the fluid conduits are easier to achieve in these smaller individual parts.
• each annular groove is a double sealing arrangement each comprising a primary 8,9 and a secondary 12,13 sealing ring in respective grooves.
• the sealing rings are lip seals with U-shaped cross-sections. They are arranged with the open arms facing away from the fluid path defined by annular groove 3. In this embodiment this is radially inwardly of the connector in contrast to the arrangeemnt of the embodiments described above where the arms face radially outwardly (but still away from the fluid path) .
• sealing rings seal the production fluid against leakage in the clearance between relatively moveable surface 4,5 below the groove 3 and between surfaces 6 and 7 above. They are thus known as dynamic seals. They are activated by pressurised barrier fluid applied through channels 44 to the open side to create a pressure differential. Roller bearings 65 are provided to assist the relative movement between surfaces 4 and 5 and between surfaces 6 and 7. Sliding or needle bearings 66 assist movement between facing vertical surfaces. Static seals 28 comprising O-rings 19 and back-up plates 20 are also used in the connector as shown, but these are used between surfaces which have a fixed relationship to each other. These static seals may alternatively comprise U-shaped lip seals pressurised by barrier fluid supplied through drilled communication channels.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)
• Joints Allowing Movement (AREA)
• Joints With Pressure Members (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10783192

Family Applications (1)

Country Status (12)

Cited By (5)

Families Citing this family (10)

Citations (5)

Family Cites Families (2)

• 1995
  • 1995-11-01 GB GB9522325A patent/GB2306587B/en not_active Expired - Lifetime
• 1996
  • 1996-10-25 MY MYPI96004445A patent/MY128752A/en unknown
  • 1996-10-31 CN CN96198022A patent/CN1079926C/zh not_active Expired - Lifetime
  • 1996-10-31 KR KR1019980703118A patent/KR19990067168A/ko not_active Withdrawn
  • 1996-10-31 WO PCT/GB1996/002669 patent/WO1997016674A1/en not_active Ceased
  • 1996-10-31 CA CA002236305A patent/CA2236305C/en not_active Expired - Lifetime
  • 1996-10-31 JP JP51715397A patent/JP4002609B2/ja not_active Expired - Lifetime
  • 1996-10-31 EP EP96935140A patent/EP0854999B1/en not_active Expired - Lifetime
  • 1996-10-31 NO NO19964615A patent/NO315481B1/no not_active IP Right Cessation
  • 1996-10-31 AU AU73218/96A patent/AU700758B2/en not_active Expired
  • 1996-10-31 BR BR9611427-4A patent/BR9611427A/pt not_active IP Right Cessation
  • 1996-10-31 DK DK96935140T patent/DK0854999T3/da active

Patent Citations (5)

Non-Patent Citations (1)

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