دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A heavy flanged connection that is installed on top of a casing string. Once it is installed, it provides a housing for the next casing string, which is suspended from it. Also called a spool.

a term that applies to the wellhead flange that forms the transition between pipe and the flange-build tree. It may be attached by threads, welding, pressure forming or lock-ring/screw devices.