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Thermal expansion relieving flow rate and DP consideration

Thermal expansion relieving flow rate and DP consideration

Thermal expansion relieving flow rate and DP consideration

(OP)
Dear Sir/Madam

sorry to bother your all this trivial.

Thermal expansion relief valves are required in liquid-full systems if the system can be blocked in and/or subjected to heat input from the atmosphere or process that results in overpressure.

The question is below (please see attached file):

Q1.PSV set pressure should follow the Design pressure for the equipment protected (in this example HX DP= 22 kg/cm2g) or follow the downstream header pressure design pressure(in this example
hot oil return header = 11kg/cm2g)

Q2.This HX located around 7 m so is the fire case scenario should be consider or thermal expansion scenario case should be considered ? But, in this example, the fluid is hot oil and it should not vaporized

so fire case may not be in the consideration. Am I right?

Q3. About thermal expansion case, is the method in my post attachment appropriated right or not?

Thank you so much.

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