نمایش نتیجه 1 تا 3 از 3 نتیجه یافت شده برای swivel stem:
n: see swivel stem.
n: see sinker bat;swivel stem.
n: a length of pipe inside the swivel that is installed to the swivels washpipe and to which the kelly (or a kelly accessory, such as the upper kelly cock) is attached. It conducts drilling mud from the washpipe and to the drill stem. See washpipe.
n: The rotary carrying pipe fittings in the swivel,its shoulder sitting on the main bearing and join with kelly bar by nipple.
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© ۱۳۹۲-۱۳۹۷ این اثر شامل قانون حمایت از مولفین بوده و هرگونه کپی برداری از آن ممنوع است.
