Pipeline field joint having an epoxy layer extending between the existing coatings

摘要

A pipeline field joint is bordered at opposite ends by existing coating, the field joint comprising a continuous epoxy or epoxy phenolic layer 5 which contacts and extends from the existing coating (4 in figure 1) at one end to the existing coating at the opposite end of the pipe joint. The epoxy (or epoxy phenolic) layer 5 may be a primer layer, and the epoxy primer layer is ideally applied as a liquid resin to the field joint. Preferably, the epoxy primer layer extends over the existing / original coating. The existing coating may be a plastics material, preferably polyolefin, more preferably polypropene. Once the epoxy primer has cured, a mould 6 may be located over the dried joint, and subsequently filled with a curable coating 7, preferably a polyurethane coating. The mould may be subsequently removed.