Sizing of safety valve is pretty well documented and there are a lot of international standards and internal criteria to be used as guidelines, but I just want to recap the most important, to highlight some non-well known technical aspects and the main differences for the fire case.

What’s inside?

1. International standards and main differences
2. How and what is the impact of properties estimation in safety valve sizing
3. Tips for screening of properties and normal and recommended ranges of latent heat, abnormal values of Z, Cp per Cv and enthalpy behavior
4. Step by step numerical example to calculate the latent heat of vaporization
5. How to proceed if the flowsheet simulator could not compute the latent heat and properties at relieving pressure
6. What to use when the simulator report a temperature higher than 430°C for fire case
7. The 100% liquid system behavior during fire case, what and why need to be reported on PSV process data sheet.

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With respect and joy to share free technical info,
Mihail

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