Oil Well Annular Blowout Preventer 21 1/4″-5000psi BOP API 16A Annular Bop is applied for oil well drilling operation as the important part of the ... 続きを読む
Oil Well Blowout Preventer 13 5/8" x 5000psi Annular BOP API 16A Annular Bop is applied for oil well drilling operation as the important part of well ... 続きを読む