Dear All,
I want to size a PSV based on blocked discharge case. My protected equipment has 120 MMSCFD as maximum expected flowrate. The fluid is natural gas.
If I want to size this PSV, should I set 120 MMSCFD as the relieving rate? Can I get reduced relieving rate?
Because API 521 state the following:
"Consideration can be given to the reduction of the relief rate as the result of the relieving pressure being above operating pressure."
And if so, how do I calculate the reduced relieving rate?