FIELD WELD PROTECTION SYSTEM

摘要

A method of providing corrosion protection to a joint area in a weight coated marine pipe line and a tape suitable for use in that method. The pipe line comprises a plurality of pipes (2) each with an anti-corrosion coat (4) and a weight coat (6) applied over the anti-corrosion coat (4). The method comprises (a) applying as a circumferential wrap: (i) a first tape member comprising a flexible heat resistant waterproofing backing film (22) such as a high temperature PVC film and a pressure sensitive adhesive layer (28) having a width spanning and adhered to a first joint length of exposed pipe (2a) on either side of a welded joint (4b) and at least partially overlying and adhered to a second joint length adjacent to the first joint length on either side of the joint covered by the anti-corrosion coat, but not the weight coat; and (ii) a second tape member (24) comprising a high melting point abrasion resistant film such as a polyester film having a width less than the width of the first tape member (22) and being laminated at the centre of the outer surface of the first tape so as when applied to overlie the first joint length of exposed pipe (2a) and not to overlie the second joint length (4b), and (b) filling the joint volume (10). The first and second tape members are conveniently provided in the form of a prelaminated tape with the pressure-sensitive adhesive layer (28) protected by a release film or paper (30).