Lokhu kushiwo ukuhlinzeka ngezinga lokukhiqiza lesistimu yamapayipi ukuhambisa amanzi, igesi kanye nowoyela ezimbonini zikawoyela negesi yemvelo.
Kunamazinga amabili wokucaciswa komkhiqizo, i-PSL 1 ne-PSL 2, i-PSL 2 inezidingo eziyisibopho zokulingana kwekhabhoni, ukuqina kwe-notch, amandla aphezulu wokukhiqiza namandla aqinile.
IBanga B, X42, X46, X52, X56, X60, X65, X70 kanye ne-X80.
I-Cangzhou Spiral Steel pipes group co., Ltd ihlinzeka ngamapayipi e-SAWH ahlanganisa ibanga ukusuka ku-API B kuya ku-X70, sathola isitifiketi se-API 5L eminyakeni edlule futhi manje amapayipi ethu olayini asetshenziswa kakhulu yi-CNPC, i-CPECC kumaphrojekthi awo wamapayipi.