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The plot thickens. The relief valve in question is situated on the discharge line of a pump. The discharge relief valve vents into the pump's suction line. The suction line is normally at 250 psig. The pump's discharge normally runs 5,500 psig. The pump's discharge relief valve is set...

I don't have access to API RP-520. Might you summarize? Thanks.

The solution selected by the PHA team was to recommend controls on the reactants upstream of the reactor so that the supply pressures (individually & collectively) couldn't exceed the MAWP of the reactor. This solution avoids the pluggage problems that only occur once the reactants combine. As...

Thanks for the feedback, rjoaks. Why does the difference in pressure over area not apply?

The process itself is pluggage prone. At the pressures that the process operates at, filters/strainers are probably not feasible anyway.

Thanks to all for the valuable feedback. For the time being, the PHA team will make a recommendation that the relief valves be reevaluated. The relief valve manufacturer will also be contacted.

This is a conventional valve on the discharge of a reactor feed pump - liquid service. Since the reactor frequently has pluggage problems on its discharge (stopping all pump flow), redundant relief valves to prevent overpressure may be appropriate here. Vendor documentation may not be...

I posted the following in the Chem-E section but received no response. Might this forum help? A question has come up in a process hazards analysis (PHA): A relief valve (standard spring loaded) is fitted to a vessel. The MAWP of the vessel is 6,500 psig. The relief valve is set at 6,500...

A question has come up in a process hazards analysis (PHA) that I'm conducting for a client. I'm confident that I know the answer to this, but I wanted to run it by the forum for confirmation. A relief valve (standard spring loaded) is fitted to a vessel. The MAWP of the vessel is 6,500 psig...

A HAZOP I am currently participating in came upon the following situation: A fired furnace has three sets of burners. Two of the three sets are fed by a common header protected by a single double-block-and-bleed trip valve trio. These two burner sets have their own temperature or pressure...