SEALING ARRANGEMENTS FOR SUBSEA PIPE-IN-PIPE SYSTEMS

摘要

A method of sealing an annulus (16) of an electrically trace-heated pipe-in-pipe structure comprises introducing a flowable filler material (30) to mould a sealing massin situ. The sealing mass closes a restriction at which the annulus is narrowed radially and embeds at least one heating element (10) that extends generally longitudinally through the restriction. The structure comprises an inner ring spaced within an outer ring to define the annulus between said rings. The annulus is narrowed radially by one or more projections (38, 40) that extend radially into the annulus from at least one of said rings toward the other of said rings. The restriction may comprise multiple bores, each of which may contain a sealing mass around a respective heating element in the bore.