دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a part of turbine. That is lower part clamping joint, at the same time it is also a seal device of main bearings lower ,main bearing and covering.

n: in an engine, a large circular friction-reducing device installed on the engines crankshaft. Main bearings are mounted in the engines crankcase and the crankshaft rotates on them. Engine oil lubricates them as the engine runs. Most main bearings are plain bearings, in that their wear surface is flat or plain and do not have balls or rollers. Compare ball bearing, roller bearing.

n: the bearing in rotary , it main function is to bearing or forwarding.

n: the maximum load that beared by main bearing of swivel , cog and center tube. Which should assorted with the maximum load of hook.

n: The pulpitb cast steel workpiece be setted on the rotary through main bearing.

n: The rotary carrying pipe fittings in the swivel,its shoulder sitting on the main bearing and join with kelly bar by nipple.

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.

n: the distance from the centerline of the main bearing of a crankshaft to the centerline of the connecting-rod journal. Two times the throw equals the stroke.

a fault’s vertical displacement.