Dear all,
I have a doubt regarding the design pressure of piping systems protected with thermal relief valves.
The questioin is that when you pressurize an isolated (protected with a TRV) piping system by increasing its temperature, certain amount of liquid will be released.
When it cools down to normal temperature, the volume of the evacuated liquid must be filled with vapour, at a pressure equal to the vapour pressure of that liquid.
I have seen that systems under steam out, must be designed for FV.
On the other hand, I am not so used to seeing systems (that may be isolated and packed with liquid) designed for this requirement. I am thinking for example of pipe filled with diesel or any liquid with a relatively low vapour pressure.
Am I wrong in any point of my question?
Are ASME16.3 piping normally designed for FV or is it capable of withstanding that effort by default?
Thank you in advance,