Question 57 in 2014: Pressure drop of control valves
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When calculating the resistance of a piping system, which of the following statements are correct? A. Calculate the pipeline resistance with the valve in its fully open position. B. Calculate the pipeline resistance with the valve in a partially open position. C. Under normal circumstances, the pressure drop across the control valve should account for about 30% of the total system pressure drop. D. When the flow rate is relatively stable, the pressure drop across the control valve can also be around 30% of the total system pressure drop. This is a multiple-choice question; A is definitely correct, while the correctness of C and D is unclear. I would like to ask where C and D come from
I think I saw C in the association’s books; you can look for it yourself. I don’t have any books with me right now
:Handshake 8.2.1.3 is explained in detail
Is the answer a multiple-choice question? ? ? ? ?
Could you tell me the title of the association version?
Revised Guide for the National Licensed Chemical Engineering Professional Qualification Examination