Tar-shealladh air Structar Pìoban Petroleum Pìoban Pìoban pìoban petroleum pìoban Asme Sa106, asme sa179, asme SA192, asme Sa210, asme sa213, asme sa335, msaa Ìre Structar Pìoban Petroleum pìoban API 5L PSL1, PSL2 Api 5l Api 5l gr.b x42 x52 x60 x65 x75 x70 msaa Api 5ct-2018 casan agus tubing Api 5ct API 5ct J55, K55, N80, N80Q, msaa