دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the distortion of the hull of an offshore drilling rig when the bow and the stem are lower than the middle, caused by wave action or unbalanced or heavy loads. Compare sagging.

n: the distortion of the hull of a vessel when the middle is lower than either end because of excessively heavy or unbalanced loads. Compare hogging.

n: 1. an extra support placed under the middle of racked pipe to keep the pipe from sagging. 2. a relatively narrow splinter of a rock formation that is stratigraphically disjointed. interrupts the consistency of another formation. and makes drilling that formation less predictable. A shale formation. for example. may be broken by a stringer of sandstone.