نمایش نتیجه 1 تا 3 از 3 نتیجه یافت شده برای crown block saver:
n: Refers to the situation that the block strikes crown pulley when crown block saver is out of order and the clutch is not reliefed timely.
n: See crown-block protector.
n: The distance from apex face of derrick ridgepole to back plane of crownblock beam or crown block saver along with the center line of derrick leg according to API criterion.
© ۱۳۹۲-۱۳۹۷ این اثر شامل قانون حمایت از مولفین بوده و هرگونه کپی برداری از آن ممنوع است.
