دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device used in the flow cross of the Christmas tree as a thread protector while the rods are being run. Because it is brass, it prevents friction sparks.

a four-way connection. In a wellhead, a flow cross connects the master valve and the swab valve with two, normally horizontal, connections to the wing valves.

a three-way connection. In a wellhead, a flow cross connects the master valve and the swab valve with the wing valve.

the valve on the flow cross that controls the exit point as produced fluids flow from the tree.

the valve at the top of the tree, above the flow cross or flow Tee. The lubricator for interventions may be attached above this valve or the valve may be removed to fit a larger lubricator.