1. sketch: Water line.
Are the two TRV's needed? If it can be proved that the ambient temperature (as well as sun radiation) is not possible to warm up the water to expand to the pipeline design pressure?
2. evaporator blocked-in
Some other posts mentioned: to protect the evaporator from overpressure when the process side is blocked, a TRV is installed on the process side. Won't that be a PSV? As by definition, TRV only allows liquid relief.
3. Sketch 2:
The System downstream pump is designed at 30barg the SOP pressure. The RV on the tank is set at 30barg and relief case is fire case. Is the RV also able to protect the system from thermal expansion?