A subsea pipeline (10) of pipe-in-pipe configuration comprises an inner pipe (14), an outer pipe (16) spaced radially from the inner pipe and an annulus (20) defined by the radial spacing between the inner and outer pipes. A series of longitudinally-spaced outward projections (22) extend radially outwardly into the annulus from the inner pipe and are movable longitudinally relative to the outer pipe. A corresponding series of longitudinally-spaced inward projections (24) extend radially inwardly into the annulus from the outer pipe and are movable longitudinally relative to the inner pipe. When the inner pipe is subject to thermal elongation or contraction in use of the pipeline, the inner pipe is movable longitudinally relative to the outer pipe, hence moving the outward projections between and relative to the inward projections. The pipeline may be buried to restrain the outer pipe. The annulus may be flooded, in which case the inner pipe is covered with wet insulation.

A subsea pipeline (10) of pipe-in-pipe configuration comprises an inner pipe (14), an outer pipe (16) spaced radially from the inner pipe and an annulus (20) defined by the radial spacing between the inner and outer pipes. A series of longitudinally-spaced outward projections (22) extend radially outwardly into the annulus from the inner pipe and are movable longitudinally relative to the outer pipe. A corresponding series of longitudinally-spaced inward projections (24) extend radially inwardly into the annulus from the outer pipe and are movable longitudinally relative to the inner pipe. When the inner pipe is subject to thermal elongation or contraction in use of the pipeline, the inner pipe is movable longitudinally relative to the outer pipe, hence moving the outward projections between and relative to the inward projections. The pipeline may be buried to restrain the outer pipe. The annulus may be flooded, in which case the inner pipe is covered with wet insulation.

A device for connection of double-wall pipes including an interior connection system connecting the first and second interior pipes and an exterior connection system including a first part that cooperates with an end section of the first exterior pipe and a second part that cooperates with an end section of the second exterior pipe. The exterior connection system is configured so that at a first temperature at least one of the first and second parts exerts a contact force on the end section of the corresponding first or second exterior pipe greater than at a second temperature higher than the first temperature in order to reinforce the seal, especially in the event of a hydrogen leak when hydrogen is present in the first and second interior pipes.

A device for connection of double-wall pipes including an interior connection system connecting the first and second interior pipes and an exterior connection system including a first part that cooperates with an end section of the first exterior pipe and a second part that cooperates with an end section of the second exterior pipe. The exterior connection system is configured so that at a first temperature at least one of the first and second parts exerts a contact force on the end section of the corresponding first or second exterior pipe greater than at a second temperature higher than the first temperature in order to reinforce the seal, especially in the event of a hydrogen leak when hydrogen is present in the first and second interior pipes.

The present invention relates to a composite coating for an inner tube delimiting a passageway for a fluid for obtaining a pipe for conveying fluids in HVACR systems.

The present invention relates to a composite coating for an inner tube delimiting a passageway for a fluid for obtaining a pipe for conveying fluids in HVACR systems.

The purpose of the present invention is to provide a heat insulating structure, a heat insulating body, a method for manufacturing a heat insulating structure, and a method for manufacturing a heat insulating body that can substantially reduce a manufacturing cost and a manufacturing time. A heat insulating structure is provided with: a plurality of partition members that are reticulately provided in a space region between one wall part and another wall part opposed to the one wall part and partition the space region into a plurality of partition spaces from the side of the other wall part to the side of the one wall part; and a plurality of fraction members that are provided to support the one wall part and fractionize partition spaces facing the one wall part among the plurality of partition spaces so as to be gradually smaller toward the side of the one wall part.

The purpose of the present invention is to provide a heat insulating structure, a heat insulating body, a method for manufacturing a heat insulating structure, and a method for manufacturing a heat insulating body that can substantially reduce a manufacturing cost and a manufacturing time. A heat insulating structure is provided with: a plurality of partition members that are reticulately provided in a space region between one wall part and another wall part opposed to the one wall part and partition the space region into a plurality of partition spaces from the side of the other wall part to the side of the one wall part; and a plurality of fraction members that are provided to support the one wall part and fractionize partition spaces facing the one wall part among the plurality of partition spaces so as to be gradually smaller toward the side of the one wall part.

A method of fabricating a conduit comprises steps of attaching a first tubular-outboard-ply end of a tubular outboard ply to a first inner collar portion of a first collar with a third weld and attaching a second tubular-outboard-ply end to a second inner collar portion of a second collar with a fifth weld. The method additionally comprises steps of interconnecting the first inner collar portion and a first outer collar portion of the first collar with a first weld and interconnecting the second inner collar portion and a second outer collar portion of the second collar with a sixth weld. The method also comprises attaching a trimmed first corrugated-inboard-ply end to the first outer collar portion with a second weld, attaching a trimmed second corrugated-inboard-ply end to the second outer collar portion with a fourth weld, and communicatively coupling a first sensor with an interstitial space.

A method of fabricating a conduit comprises steps of attaching a first tubular-outboard-ply end of a tubular outboard ply to a first inner collar portion of a first collar with a third weld and attaching a second tubular-outboard-ply end to a second inner collar portion of a second collar with a fifth weld. The method additionally comprises steps of interconnecting the first inner collar portion and a first outer collar portion of the first collar with a first weld and interconnecting the second inner collar portion and a second outer collar portion of the second collar with a sixth weld. The method also comprises attaching a trimmed first corrugated-inboard-ply end to the first outer collar portion with a second weld, attaching a trimmed second corrugated-inboard-ply end to the second outer collar portion with a fourth weld, and communicatively coupling a first sensor with an interstitial space.