نمایش نتیجه 1 تا 1 از 1 نتیجه یافت شده برای dart-type inside blowout preventer:
n: a drill pipe inside blowout preventer that is installed on top of the drill stem when the well is kicking through the drill stem. It is stabbed in the open position and then closed against the pressure. The valve that closes is dartshaped, thus the name.
© ۱۳۹۲-۱۳۹۷ این اثر شامل قانون حمایت از مولفین بوده و هرگونه کپی برداری از آن ممنوع است.
