What is the main difference between Accumulation and Over pressure for a relief valve? could anyone explain their importance while sizing a relief valve.
Lionel SHEIKBOUDHOU, Sara, firstname.lastname@example.org
Overpressure is relative to set pressure while accumulation is relative to MAWP (or design pressure).
So, Relieving pressure = set pressure + overpressure = MAWP (or design pressure) + accumulation.
The relieving pressure appears in the sizing equations so you need to calculate it.