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The results of a recent PSV study at one of our plants indicate that we will need to install some new PSVs on piping and Section VIII vessels. We plan to do the installations online which will require hot taps. API 520 and ASME Sec. VIII are fairly clear that the inlet piping to the PSV SHALL...

Thanks georgeverghese and MortenA for the feedback. Weep holes or drains in the low point of the exit stack is our standard design now. Unfortunately, these compressor station (1960s vintage) vents were designed such that the exit stacks are pocketed underground, so a conventional drain system...

My company deals with gas transmission. We have several compressor stations in which the PSVs and blowdowns vent to the atmosphere. Many of them have older style CS flapper valves at the top of the vent to prevent water and debris accumulation. The industry and API discourage the use of these...