Problems encountered in calculating the relief volume of safety valves are welcome to discuss
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When calculating the relief amount of the safety valve, for the control valve installed at the inlet of the equipment, if it is in the fully open position when a fault occurs: For gas phase pipelines, if the design pressure on the low-pressure side is less than 2/3 of the design pressure on the high-pressure side, the relief valve's relief capacity should be calculated as follows:: W=3171.3(CV1-CV2)Ph(Gg/T)1/2 where: W————mass discharge flow rate, kg/h ； CV1——Cv value of control valve ； CV2---Cv value at the minimum flow rate of the control valve ； Ph---high pressure side working pressure, MPa ； Gg --- gas phase density, kg/m3 ； T---discharge temperature, K. I also came across a calculation formula: As shown in the picture, the discharge amount calculated by these two formulas is quite different. Has anyone encountered such a problem?
Excuse me, where did you get these two formulas from? I think specific circumstances and detailed analysis are needed. For example, if the design pressure of the equipment behind the valve (or the set pressure of the safety valve) is greater than the pressure of the air source of the regulating valve, there is no need to consider this relief amount.
Which specification manual does the second calculation formula come from?