Process Design: [One Question per Day] 10-11-17 [Wednesday]
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This post was last edited by jintchinssen on 2010-11-16 at 16:11. Multiple-choice question: When installing flow control orifice plates in pipelines carrying gases or vapors, in order to avoid choked flow in such pipelines, the pressure behind a single orifice plate (P2) must not be less than _____ of the pressure before the plate (P1). (The above pressures are all absolute pressures) A, 45% B, 50% C, 55% D, 60% Note: 1) All participants will receive a reward. 2) Please hide your replies; the method to do this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit the replies after posting them. : ^3 ?8 L0 {1 |2 I# d 3) The answer will be visible after responding. Answer: C, 55%. Refer to HG/T 20570.15-1995 for the installation of flow-limiting orifice plates in pipelines
When installing flow-limiting orifice plates in pipelines carrying gaseous or vapor media, in order to avoid choked flow in such pipelines, the pressure behind a single orifice plate (P2) must not be less than 55% of the pressure in front of the plate (P1). (The above pressures are all gauge pressures)
When installing flow control orifice plates in pipelines carrying gaseous or vapor media, in order to prevent choked flow in such pipelines, the pressure behind a single orifice plate (P2) must not be less than __C___ of the pressure before the plate (P1). (The above pressures are all gauge pressures)
I chose C, but I’m not entirely sure; looking forward to an answer.
C, 55% C, 55%