دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device that holds an orifice plate centred in the line in which a fluid is flowing. It consists of two pieces that are joined by placing them together and tightening bolts and nuts. The orifice plate fits between the two pieces. To remove or inspect the orifice plate in a flanged fitting. the line must be bled and the flow of fluid rerouted so that no pressure exists on the fitting.