... 1.The product have been mainly used in Petroleum & Gas,chemical plant,power station,metallurgy,shipbuilding,etc. 2.Strictly production process,under ... WP12,WP11,WP22,WP5,WP9,WP91,ect)qualificationISO9001 API CEapplicationPetroleum, chemical, machinery, electric power, shipbuilding, papermaking, construction, etcSpecial design available as ...