| 摘要 |
<p>A T-piece preformer for forming a T-piece in a pipe-in-pipe (PIP) pipeline for laying in a marine environment, the PIP pipeline comprising at least inner and outer pipes having an annular space thereinbetween, and one or more cables extending along the annular space, the T-piece preformer comprising at least: • (a) inner and outer longitudinal collars (24, 22) corresponding in circumference to the circumferences of the inner and outer pipes of the PIP pipeline; • (b) one or more annular walls (26) extending between the inner and outer collars; • (c) one or more cable apertures (28) through each annular wall; and • (d) one or more guide points (30) on the outer collar radially offset from the or each cable apertures, and able to provide guidance for a hole into the T-piece preformer from outside the outer collar to within the inner collar. The T-piece preformer can be assembled into a PIP pipeline onshore, and only requires the provision of a final hole during laying. Moreover, the T-piece preformer has one or more cable apertures through each annular wall, particularly adapted for allowing the continuation of cables in the annular space through the PIP pipeline and T-piece preformer, and the then formed T-piece.</p> |
