دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device placed or hung in the casing below the blowout preventer stack to form a pressure-tight seal. Pressure is then applied to the blowout preventer stack to test it for leaks.

n: a kind of tool which is put or hung under the BOP stack unitization and used as wiper seal

a plug placed below the BOP prior to a pressure test.