A pipe-in-pipe assembly with thermally-insulating spacers positioned in an annulus to act radially between inner and outer pipes is disclosed. The spacers have at least one circumferentially-extending array of circumferentially-spaced ribs that define longitudinally-extending passageways in gaps between neighbouring ribs of the array. Cables including heating elements extend longitudinally along, the annulus outside the inner pipe. The cables extend longitudinally along the passageways. At least one insulation layer disposed radially outboard of the cables has insulating elements disposed in the gaps between the ribs and/or an insulating layer extending around the inner pipe, positioned radially outboard of the ribs and bridging the gaps. Bands encircle and retain components of the insulation layer. Insulation may also be disposed on the inner pipe between first and second arrays of ribs, those arrays being spaced longitudinally from each other.

A sealing device comprising: an axially deformable tubular membrane (4) having a first annular end and a second annular end (8), a first annular coupling ring (5; 205) rigidly connected to the first end of the tubular membrane and having a lateral annular wing (10) providing an axial annular attachment space (12) that is axially open on the side of the second annular end of the tubular membrane and is radially located on a lateral side of the tubular membrane, and a second coupling ring (7) rigidly connected to the second end of the tubular membrane and having a projecting lateral annular ring (14) axially extending opposite the first annular end of the tubular membrane and radially offset opposite said axial annular attachment space relative to said lateral side of the tubular membrane. An assembly comprising two coaxial ducts (2, 3) engaged together, between which the sealing device is mounted.

A sealing device comprising: an axially deformable tubular membrane (4) having a first annular end and a second annular end (8), a first annular coupling ring (5; 205) rigidly connected to the first end of the tubular membrane and having a lateral annular wing (10) providing an axial annular attachment space (12) that is axially open on the side of the second annular end of the tubular membrane and is radially located on a lateral side of the tubular membrane, and a second coupling ring (7) rigidly connected to the second end of the tubular membrane and having a projecting lateral annular ring (14) axially extending opposite the first annular end of the tubular membrane and radially offset opposite said axial annular attachment space relative to said lateral side of the tubular membrane. An assembly comprising two coaxial ducts (2, 3) engaged together, between which the sealing device is mounted.

A method of sealing the interstice in double-walled pipe includes the steps of applying a first sealing piece to an inner pipe of the double-walled pipe, wherein the first sealing piece covers a portion of the circumference of the inner pipe; and applying a second sealing piece to the inner pipe of the double-walled pipe, wherein the second sealing piece covers the remainder of the circumference of the inner pipe. The method further includes the step of attaching the first sealing piece to the second sealing piece forming a sealer; wherein the sealer is disposed in an annular space located between the inner pipe and an outer pipe. A sealer configured to seal an opening between pipes in a double-walled pipe includes a first sealing piece having a rounded cross-section with an attachment portion configured to engage a corresponding attachment portion disposed on a second sealing piece.

A method of sealing the interstice in double-walled pipe includes the steps of applying a first sealing piece to an inner pipe of the double-walled pipe, wherein the first sealing piece covers a portion of the circumference of the inner pipe; and applying a second sealing piece to the inner pipe of the double-walled pipe, wherein the second sealing piece covers the remainder of the circumference of the inner pipe. The method further includes the step of attaching the first sealing piece to the second sealing piece forming a sealer; wherein the sealer is disposed in an annular space located between the inner pipe and an outer pipe. A sealer configured to seal an opening between pipes in a double-walled pipe includes a first sealing piece having a rounded cross-section with an attachment portion configured to engage a corresponding attachment portion disposed on a second sealing piece.

A pipe-in-pipe bulkhead assembly has inner and outer rings spaced in concentric relation to define a thermally-isolating gap in the annulus between them. Interlocking formations project into the annulus from each of the rings, presenting confronting faces where they overlap radially. The gap extends between the longitudinally-spaced faces. A thermally-insulating spacer is interposed between the faces in the gap to carry axial mechanical loads between the inner and outer rings. Heating elements outside the inner ring extend longitudinally beyond the gap between the faces and along a longitudinal passageway that passes through or beside an interlocking formation of the inner ring. The spacer may be positioned before or after the outer ring is placed, for example as a discrete element or as an injected mass. An additional sealing mass may also be positioned in the annulus, for example by injection, to promote a gas-tight seal.

A pipe-in-pipe bulkhead assembly has inner and outer rings spaced in concentric relation to define a thermally-isolating gap in the annulus between them. Interlocking formations project into the annulus from each of the rings, presenting confronting faces where they overlap radially. The gap extends between the longitudinally-spaced faces. A thermally-insulating spacer is interposed between the faces in the gap to carry axial mechanical loads between the inner and outer rings. Heating elements outside the inner ring extend longitudinally beyond the gap between the faces and along a longitudinal passageway that passes through or beside an interlocking formation of the inner ring. The spacer may be positioned before or after the outer ring is placed, for example as a discrete element or as an injected mass. An additional sealing mass may also be positioned in the annulus, for example by injection, to promote a gas-tight seal.

A sealing assembly for providing in an opening a sealing through which at least one cable, pipe or duct extends is disclosed. The assembly includes a transit-unit of a relatively inflexible material, wherein the transit-unit comprises one or a plurality of conduits extending in a longitudinal direction of the transit-unit. Each conduit is suitable for receiving at least one of the at least one cable, pipe or duct. A method for providing in an opening a sealing system through which at least one cable, pipe or duct extends is disclosed. The method includes providing a transit-unit of a relatively inflexible material, wherein the transit-unit comprises one or a plurality of conduits extending in a longitudinal direction of the transit-unit. Each conduit is suitable for receiving at least one of the at least one cable, pipe or duct.

A sealing assembly for providing in an opening a sealing through which at least one cable, pipe or duct extends is disclosed. The assembly includes a transit-unit of a relatively inflexible material, wherein the transit-unit comprises one or a plurality of conduits extending in a longitudinal direction of the transit-unit. Each conduit is suitable for receiving at least one of the at least one cable, pipe or duct. A method for providing in an opening a sealing system through which at least one cable, pipe or duct extends is disclosed. The method includes providing a transit-unit of a relatively inflexible material, wherein the transit-unit comprises one or a plurality of conduits extending in a longitudinal direction of the transit-unit. Each conduit is suitable for receiving at least one of the at least one cable, pipe or duct.

An exhaust adapter secures an exhaust tube relative to an exhaust pipe. The exhaust adapter is formed to have an annular shape enclosing a through hole, and is mounted on the outer peripheral surface of the exhaust tube and on the inner peripheral surface of the exhaust pipe by inserting the exhaust tube into the through hole. When the exhaust adapter is being fitted on the outer peripheral surface of the exhaust tube, the inner peripheral surface of the exhaust adapter presses the outer peripheral surface of the exhaust tube, and when the exhaust adapter is being fitted on the inner peripheral surface of the exhaust pipe, the outer peripheral surface of the exhaust adapter presses the inner peripheral surface of the exhaust pipe.