PROCESS FOR LINING METAL PIPELINES

摘要

The present invention pertains to a process for lining a metal pipeline, said process comprising the following steps: (i) processing a thermoplastic fluoropolymer composition to yield a pipe liner having an outer diameter greater than the inner diameter of said metal pipeline, said thermoplastic fluoropolymer composition comprising: (A) from 10% to 60% by weight, on the total weight of polymer (A) and polymer (B ) of at least one vinylidene fluoride (VDF) homopolymer [polymer (A)], (B ) from 40% to 9 0% by weight, based on the total weight of polymer (A) and polymer (B ) of at least one VDF copolymer comprising from 2% to 15% by moles of recurring units derived from at least one other fluorinated comonomer ( F) [polymer (B )], and (ii) deforming said pipe liner, (iii) introducing the deformed pipe liner in said metal pipeline; and (iv) expanding the deformed pipe liner to fit with the inner diameter of said metal pipeline. The present invention also relates to a pipeline system.