Design Criteria for PSV outlet Pipe (Hazardous Service) 1

[ak1965]

We are in the process of designing an outlet pipe specifications for a PSV with hazardous Hydrocarbon service.

Should an unforeseen fire situation in the PSV outlet pipe have an impact on calculation of outlet pipe size??

Normally, what I believe that the flow rate, pressure and temperature in the outlet pipe of PSV should be considered crietria for deciding the specifications.

Any further opinions?

 

[BigInch]

Use the scenario that causes the PSV lifting pressure and its corresponding temperature. If that is the fire scenario, use that temperature. If its a maximum pressure experienced during some upset operating condition, use the corresponding temperature for that case.

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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

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[skearse]

Pay attention to the 10% rule, also, if this is a conventional valve, for sizing the discharge piping.