Dsac
Chemical
- Feb 3, 2011
- 2
Hello,
This is regarding reduction of PSV(conventional valve)set pressure of the existing facility where few modifications are being done .PSV (sized for blocked outlet) is around 350 m away from the source of pressurization(PCV xxx) .Please refer to the attched sketch. I may have to reduce the PSV set pressure by a value equivalent to pressure loss from source (PCV xx) to PSV. To do that, I need to know ans of the following Q’s:
i) Whether Pressure loss to be calculated from PCV xxx to junction of PSV inlet pipe or till PSV inlet
ii) What capacity should I consider for pressure loss, rated or normal max(required).
iii) What operating conditions should I consider for pressure drop . Same conditions as we consider for PSV inlet line size check i.e., relieving condition (Op pressure= relieving pressure & equivalent properties) .
I have checked that line pressure loss from PCV to PSV is less than 3% of PSV set pressure for rated capacity. Therefore, reduction of PSV set point is not required. However, to ensure the safety, I need to do other checks for the system and appreciate if you could pl response to above Q’s. Many thanks
This is regarding reduction of PSV(conventional valve)set pressure of the existing facility where few modifications are being done .PSV (sized for blocked outlet) is around 350 m away from the source of pressurization(PCV xxx) .Please refer to the attched sketch. I may have to reduce the PSV set pressure by a value equivalent to pressure loss from source (PCV xx) to PSV. To do that, I need to know ans of the following Q’s:
i) Whether Pressure loss to be calculated from PCV xxx to junction of PSV inlet pipe or till PSV inlet
ii) What capacity should I consider for pressure loss, rated or normal max(required).
iii) What operating conditions should I consider for pressure drop . Same conditions as we consider for PSV inlet line size check i.e., relieving condition (Op pressure= relieving pressure & equivalent properties) .
I have checked that line pressure loss from PCV to PSV is less than 3% of PSV set pressure for rated capacity. Therefore, reduction of PSV set point is not required. However, to ensure the safety, I need to do other checks for the system and appreciate if you could pl response to above Q’s. Many thanks
