In this invention a pipe (1) which is suitable for use in underground pipelines and the like comprises an inner tubular member of plastics or metal (2) around which is a layer (3) of bitumen or plastics material surrounded in turn by a water impervious and electrically insulating plastics structural layer (4).
申请公布号
WO9602785(A1)
申请公布日期
1996.02.01
申请号
WO1995GB01640
申请日期
1995.07.12
申请人
WINN & COALES INTERNATIONAL LTD.;LOOTS, FREDERICK, JACOBUS