Dear Colleagues,
A PSV is installed on a process line with a higher pressure rating. The PSV is to protect downstream lower pressure system. When calculating PSV inlet pressure loss for 3% rule, can we ignore the minor loss on the “T” between the PSV inlet pipe and the main process line?
One of my colleague suggests not to consider the pressure loss on the “T” since the PSV is installed on the main process line with a design pressure of 5000 kPag and the main process line doesn’t need PSV protection.
The reason why my colleague made this suggestion is because: If the pressure loss on the “T” is not considered, the PSV inlet pipe non‐recoverable pressure loss can then meet 3% rule.
Please refer to the attached file.
Thanks for your inputs and time in advance.
Best Regards,