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Recent content by Dulli2000

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    PSV sizing acc. to IGC

    Hello. I guess someone here already did a PSV sizing according to the IGC flow requirements, see formulas below. The fire-factor is taken from table, L (latent heat), T, Z, M are all variables defined at relieving conditions of fluid to be relieved. Could one explain how this can lead to the...
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    Relieving temperature PSV

    I know the peacesoftware, but I do not figure out how to use it for isenthalpic processes. I get the same temperature (around -6C) from the pH diagram, though. If thats the way its fie. Thanks a lot.
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    Relieving temperature PSV

    Thank you all for very helpful replies. Right, it is not steam, I am sizing for a vessel filled with liquid NH3 with vapour cushion. It is a very unlikely scenario to get the vessel emptied completely of liquid so that only gas is left. It is more likely that the vessel is filled to 95% for a...
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    Relieving temperature PSV

    There are some older threads about this, but I did not find answer to my question: For gas relief, by the way. In adiabatic processes we use T1/p1=Tn/pn (as also API521 says). I calculated a backpressure of 1,37 bara at PSV discharge and have relieving pressure of 7bara (121% set-pressure)...
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    Medium for calculation of PSV relief rate

    Hello and thank you for replying. I am sizing a PSV for a pressure vessel for firecase and with not air as fluid. I agree that the formular CGA gives is hard to understand (similar from other class societies). It calculates required flow rate of air at std. conditions that is dependent only on...
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    Medium for calculation of PSV relief rate

    Hello. When going through standards as CGA I see that they provide a formular for calculation of PSV relieving rate which is based on air at standard conditions. What is actually the idea behind sizing the PSV for air even if we usually are working with other media and how do you use this value...
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