دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: in crane operations, when a sling with two legs is attached to each end of a load, the slant or the angle the two legs make as measured from horizontal. A reduction in the strength of a sling must be allowed for angles other than 90 degrees.

n: in crane operations, a sling made from a braided wire rope.

n: in crane operations, the amount of load that causes a wire rope or a sling to fail. Also called actual strength. Compare minimum acceptance strength. nominal strength.

n: in crane operations, a sling composed of several legs, the tops of which are gathered in a fitting that goes over the cranes lifting hook. See leg.

n: in crane operations, the angle between the vertical part and choked part of a choker sling. As this angle decreases, the load-lifting capacity of the sling also decreases. See choker sling.

n: see back-pressure. choker hitch n: in crane operations, a method of attaching a sling to a load in which one end of the sling is passed around the load, through an attachment or an eye on the other end, and then to the cranes hook. As the load is lifted by the crane, the hitch tightens on the load.

n: a wire rope sling that forms CHRISTMAS a slip noose around an TREE object to re moved or lifted by a crane.

n: see slinger disk lubrication.

n: 1. an abrupt change in direction in the wellbore, frequently resulting in the formation of a keyseat. 2. a sharp bend permanently put in an object such as a pipe, wire rope. or a wire rope sling.

n: The elbow caused by a sharp change of direction in the wellbore.

n pi: in crane operations, multiple-leg slings of wire rope and fittings that equally distribute the load among the slings.