Seal assembly

摘要

A seal assembly for sealing an annular space between an inner and an outer pipe in a double-walled subsea pipeline which seal assembly:

(a) under normal operating conditions is in a non-sealing position which allows the passage of a gas through said seal assembly; and

(b) is actuatable from a non-sealing position to a sealing position in response to the entry of liquid into said annular space.