Hydrostatic shear pin

摘要: A method and apparatus for controlling the depth at which deviation occurs of a conductor casing driven vertically into ocean floor from an offshore oil platform. retractable shear pin engages both members articulated joint inserted between two sections casing, thus preventing relative movement locking it uniform vertical alignment. This ambient pressure increases with depth, thereby tending to force retract. Movement is internally prevented until exerted by exceeds desired precalculated valve. The disengages joint, resulting in path remote point.