PROCESS FOR MAKING A TIGHT COATING AROUND A PIPE FOR CONVEYING HYDROCARBONS AND THE RESULTING HYDROCARBON CONVEYING PIPE LINE

摘要

Process for the formation in situ of a tight coating of pores containing material between a hydrocarbon conveying pipe and a protecting envelope surrounding the same, said material being expansible by contact with the conveyed hydrocarbon so as to obstruct any perforation accidentally occurring in the pipe wall, said process comprising covering the pipe with a sheath of said expansible material containing a curing agent and a porophoric agent, placing the envelope around the pipe and heating the sheath by circulation of a heating fluid so as to produce simultaneously the curing of the sheath and the formation of pores therein by expansion of the sheath in the annular space provided between the pipe and the envelope.