... certified leading maunfacture .Duplex stainless steel pipe we are an ISO9001:2000,CE/PED,ABS,DNV,KR,LR,GL, GOST certified leading ... : 13m We have advanced technique and better workmanship and have passed the ISO9001:2000,CE/PED,ABS, DNV,KR,LR,GL, GOST certification. and ...