Uncoupling of the corrugations of an impervious barrier

A tanker for the transport of a cold liquid product, the tanker comprising:

• a double hull;
• and
• a tank arranged in the double hull, the tank comprising:
• a tank wall on a carrier structure, the tank wall extending from an outer side to an inner side, the tank wall comprising;
• an insulating barrier which is retained on the carrier structure, the insulating barrier covering an inner surface of the carrier structure;
• a sealed barrier which rests on the insulating barrier, and an anchoring member made of metal, the anchoring member being fixed to an upper surface of the insulating barrier, the sealed barrier comprising;
• a first undulating metal membrane which is arranged on a first portion of the insulating barrier located at one side of the anchoring member;
• a second undulating metal membrane which is arranged on a second portion of the insulating barrier located at the other side of the anchoring member and a first and a second plurality of caps;
• the first membrane having an assembly edge which is arranged on the anchoring member, the assembly edge of the first membrane being welded in a sealed manner to the anchoring member;
• the first membrane undulating with a first series of parallel undulations and a second series of parallel undulations, a direction of the first series of parallel undulations of the first membrane and a direction of the second series of parallel undulations of the first membrane intersecting, the direction of the first series of undulations of the first membrane intersects with the assembly edge of the first membrane;
• the second membrane undulating with a first series of parallel undulations and a second series of parallel undulations, a direction of the first series of parallel undulations of the second membrane and a direction of the second series of parallel undulations of the second membrane intersecting, the direction of the first series of undulations of the second membrane with an assembly edge of the second membrane;
• each of the caps comprising a metal component which has a terminal undulation portion in the form of a dome, which is intended to be connected to the respective undulation which the cap closes and which descends as far as a base plate which surrounds the terminal undulation portion;
• characterized in that the anchoring member is elongate in a longitudinal direction;
• the assembly edge of the first membrane being oriented parallel with the longitudinal direction of the anchoring member, each undulation of the first series of undulations of the first membrane being closed in a sealed manner by a respective cap of the first plurality of caps which is arranged along the assembly edge of the first membrane;
• the assembly edge of the second membrane comprising advance portions in the longitudinal direction of the anchoring member, said advanced portions covering the first membrane, the assembly edge of the second membrane further comprising recessed portions which alternate with the advanced portions and which are located in a continuation of the first series of undulations of the first membrane, each recessed portion exposing a corresponding sealed zone of the anchoring member, the caps of the first plurality of caps each time overlapping the first membrane and the corresponding sealed zone of the anchoring member exposed by the recessed portion, the advanced portions being located in alignment of the first series of undulations of the second membrane, each undulation of the first series of undulations of the second membrane being closed in a sealed manner by a respective cap of the second plurality of caps which is arranged along the assembly edge of the second membrane, the caps of the second plurality of caps overlapping each time the first membrane and a respective advanced portion;
• and
• the terminal undulation portions of the caps of the first plurality of caps, which terminal undulation portions of the caps of the first plurality of caps are associated with the first series of undulations of the first membrane, extending in a direction transverse to the assembly edge of the first membrane in the direction of the second membrane, beyond the terminal undulation portions of the caps of the second plurality of caps.

A method for loading or unloading a tanker for the transport of a cold liquid product, the method comprising:

• conveying a cold liquid product through insulated channels from or to a floating or ground-based storage installation to or from a tank within a double hull of the tanker, the tank comprising:
• a tank wall on a carrier structure, the tank wall extending from an outer side to an inner side, the tank wall comprising;
• an insulating barrier which is retained on the carrier structure, the insulating barrier covering an inner surface of the carrier structure;
• a sealed barrier which rests on the insulating barrier, and an anchoring member made of metal, the anchoring member being fixed to an upper surface of the insulating barrier, the sealed barrier comprising;
• a first undulating metal membrane which is arranged on a first portion of the insulating barrier located at one side of the anchoring member;
• a second undulating metal membrane which is arranged on a second portion of the insulating barrier located at the other side of the anchoring member and a first and a second plurality of caps;
• the first membrane having an assembly edge which is arranged on the anchoring member, the assembly edge of the first membrane being welded in a sealed manner to the anchoring member;
• the first membrane undulating with a first series of parallel undulations and a second series of parallel undulations, a direction of the first series of parallel undulations of the first membrane and a direction of the second series of parallel undulations of the first membrane intersecting, the direction of the first series of undulations of the first membrane intersects with the assembly edge of the first membrane;
• the second membrane undulating with a first series of parallel undulations and a second series of parallel undulations, a direction of the first series of parallel undulations of the second membrane and a direction of the second series of parallel undulations of the second membrane intersecting, the direction of the first series of undulations of the second membrane intersects with an assembly edge of the second membrane;
• each of the caps comprising a metal component which has a terminal undulation portion in the form of a dome, which is intended to be connected to the respective undulation which the cap closes and which descends as far as a base plate which surrounds the terminal undulation portion;
• characterized in that the anchoring member is elongate in a longitudinal direction;
• the assembly edge of the first membrane being oriented parallel with the longitudinal direction of the anchoring member, each undulation of the first series of undulations of the first membrane being closed in a sealed manner by a respective cap of the first plurality of caps which is arranged along the assembly edge of the first membrane;
• the assembly edge of the second membrane comprising advance portions in the longitudinal direction of the anchoring member, said advanced portions covering the first membrane, the assembly edge of the second membrane further comprising recessed portions which alternate with the advanced portions and which are located in a continuation of the first series of undulations of the first membrane, each recessed portion exposing a corresponding sealed zone of the anchoring member, the caps of the first plurality of caps each time overlapping the first membrane and the corresponding sealed zone of the anchoring member exposed by the recessed portion, the advanced portions being located in alignment of the first series of undulations of the second membrane, each undulation of the first series of undulations of the second membrane being closed in a sealed manner by a respective cap of the second plurality of caps which is arranged along the assembly edge of the second membrane, the caps of the second plurality of caps overlapping each time the first membrane and a respective advanced portion;
• and
• the terminal undulation portions of the caps of the first plurality of caps, which terminal undulation portions of the caps of the first plurality of caps are associated with the first series of undulations of the first membrane, extending in a direction transverse to the assembly edge of the first membrane in the direction of the second membrane, beyond the terminal undulation portions of the caps of the second plurality of caps.

A transfer system for a cold liquid product, the system comprising:

• a tanker having a double hull and a tank arranged in the double hull, the tank comprising:
• a tank wall on a carrier structure, the tank wall extending from an outer side to an inner side, the tank wall comprising;
• an insulating barrier which is retained on the carrier structure, the insulating barrier covering an inner surface of the carrier structure;
• a sealed barrier which rests on the insulating barrier, and an anchoring member made of metal, the anchoring member being fixed to an upper surface of the insulating barrier, the sealed barrier comprising;
• a first undulating metal membrane which is arranged on a first portion of the insulating barrier located at one side of the anchoring member;
• a second undulating metal membrane which is arranged on a second portion of the insulating barrier located at the other side of the anchoring member and a first and a second plurality of caps;
• the first membrane having an assembly edge which is arranged on the anchoring member, the assembly edge of the first membrane being welded in a sealed manner to the anchoring member;
• the first membrane undulating with a first series of parallel undulations and a second series of parallel undulations, a direction of the first series of parallel undulations of the first membrane and a direction of the second series of parallel undulations of the first membrane intersecting, the direction of the first series of undulations of the first membrane intersects with the assembly edge of the first membrane;
• the second membrane undulating with a first series of parallel undulations and a second series of parallel undulations, a direction of the first series of parallel undulations of the second membrane and a direction of the second series of parallel undulations of the second membrane intersecting, the direction of the first series of undulations of the second membrane intersects with an assembly edge of the second membrane;
• each of the caps comprising a metal component which has a terminal undulation portion in the form of a dome, which is intended to be connected to the respective undulation which the cap closes and which descends as far as a base plate which surrounds the terminal undulation portion;
• characterized in that the anchoring member is elongate in a longitudinal direction;
• the assembly edge of the first membrane being oriented parallel with the longitudinal direction of the anchoring member, each undulation of the first series of undulations of the first membrane being closed in a sealed manner by a respective cap of the first plurality of caps which is arranged along the assembly edge of the first membrane;
• the assembly edge of the second membrane comprising advance portions in the longitudinal direction of the anchoring member, said advanced portions covering the first membrane, the assembly edge of the second membrane further comprising recessed portions which alternate with the advanced portions and which are located in a continuation of the first series of undulations of the first membrane, each recessed portion exposing a corresponding sealed zone of the anchoring member, the caps of the first plurality of caps each time overlapping the first membrane and the corresponding sealed zone of the anchoring member exposed by the recessed portion, the advanced portions being located in alignment of the first series of undulations of the second membrane, each undulation of the first series of undulations of the second membrane being closed in a sealed manner by a respective cap of the second plurality of caps which is arranged along the assembly edge of the second membrane, the caps of the second plurality of caps overlapping each time the first membrane and a respective advanced portion;
• and
• the terminal undulation portions of the caps of the first plurality of caps, which terminal undulation portions of the caps of the first plurality of caps are associated with the first series of undulations of the first membrane, extending in a direction transverse to the assembly edge of the first membrane in the direction of the second membrane, beyond the terminal undulation portions of the caps of the second plurality of caps;
• insulated channels which are arranged so as to connect the tank to a floating or ground-based storage installation;
• and
• a pump for driving a flow of cold liquid product through the insulated channels from or to the floating or ground-based storage installation to or from the tank of the tanker.