دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a test used to identify increased friction levels in a rotary meter;it can be used as a guide for subsequent maintenance. With the meter in a bypass and a differential gauge connected to the upstream meter tap, a valve may be opened slowly enough to observe the rise and subsequent fall in the differential as the meter just begins to rotate (the downstream differential tap being vented to atmosphere).