دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the distance from the normal level of the sea surface to the bottom of the hull or base of an offshore drilling platform or rig.

n: The distance from normal sea level to drill platform when marine drilling.

the clearance between the highest water surface that occurs during the extreme environmental conditions and the underside of the deck.

n: the rock surface forming the underside of a fault when the fault plane is not vertical-that is, if the dip is less than 90�.Compare hanging wall.

n pi: breast-shaped protuberances appearing on the undersides of clouds, indicating the approach of a storm.

n: the vertical distance from the baseline of a ship or offshore vessel to the underside of the deck plating at the side. measured at the midlength of the vessel.

n: a reciprocal pumping unit in which one or more power cylinders are placed over the wellhead and a counterbalance system using compressed air or gas is provided. On the upstroke, high-pressure gas is applied to the underside of the pistons of the inside power cylinders, and low-pressure gas above the pistons is exhausted to the sales line. On the downstroke, high-pressure gas is applied to the top of the pistons, and the low-pressure gas below the pistons is exhausted to the sales line.

n: a correction applied to cargo ullages when the vessel is not on an even keel. Valid only when liquid completely covers the tank bottom and is not in contact with the underside of the deck.