Mwachidule mapaipi a petroleum mapaipi Mapaipi a petroleum Asme Sa106, Asme Sa179, Asme Sa192, Asme Sa210, Asme Sa313, ndi zina Gawo la matope a petroleum API 5L PSL1, PSL2 API 5l API 5l GR.B X42 X52 X60 x65 x65 x70 etc API 5ct-2018 Cassing ndi Tubing API 5CE API 5ct J55, K55, N80, N80Q, ndi zina