Thermal exapnsion and blocked outlet scenairo for the reservoir

[knapee]

Dear Sir

I try to size the relief valve on the a cooling coil discharge side.
And, there is a failed closed control valve on the liquid discharge line also.
I am not sure that the two scenairo, thermal expanision and blocked outlet have or not.
If we close valve on the cooling water return side, it seems not likly cuase a thermal expansion releif cause there is not any blocked valve on the upstream side.
Could you please tell me how to tell the thermal expansion exist or not?
Then, I try to calculate the blocked outlet relief load through Ferris PSV softwrare, but I don't know how to get the process parameter such as operating pressure, temperature, and set pressure?
The set preesure on P&ID show 10 barg seems not possible cause the tube side design pressure is 5 barg.

Please help me out in this complex situation ?

really appreciate it

 

[Chance17]

Liquid thermal expansion will occur
1) If both sides of the coil are blocked
2) If heat is transfered into the coil
3) If there is no compressible gas pocket to absorb the liquid expansion (volume increase with heating).

You seem to confuse thermal expansion and blocked outlet.
Thermal expansion is as described above.
Blocked outlet is the bulk supply header causing coil overpressure.
For a single source, this would be an engineering goof.
But it can happen especially if the inlet has multiple sources.