Dear all,
I am designing the thermal relief valve in long pipeline (10 km) as picture in attachment. There are some block valve that to be closed during normal operating. Therefore, cascade of thermal relief valve shall be installed in this system.
I have some question for this design.
1. The set pressure of each safety valve? Can i set the pressure of all relief valves at 18 barg?
2. Superimpose back pressure of relief valve-01? Should it be the set pressure of relief valve of next valve or normal operating pressure?
3. Relief load of PSV-02?, Relief load should be combined relief load from PSV-01 or not?
4. Can i refer to any standard or design practice?
Thank you in advance.