... .Usage:Subsea Pipeline,Steel structure,Bridge,Offshore platform, Steel pile, Offshore oil field,Gas transportation,Long distance ... pipeline,etc Subsea Pipeline,Steel structure,Bridge,Offshore platform, Steel pile, Offshore oil field, Gas transportation,Long distance ... pipeline,etcCertification:ISO9001-2000 API 5L API5CT TS16949 ISO9002 API 5L ...