Section IV Relief Valves?

[Bourbon103]

Can you have a Section IV relief valve on a Section VIII rated vessel? The vessel (water-water "water heater") is is rated: shell = 155 psig @ 220F, Tubes = 150 @ 315F. The operating temps. are shell= 160-180F, tubes = 40-140F. Operating pressures well within MAWPs. The relief valve is a section IV T&P relief valve, set @ 150 psig/210F. Are relief valves supposed to satisfy the application, or vessel design?

 

[JDistheWP]

I think this is a grey area...

 

[CHEMANG]

The basic application and intent of the safety relief valve installed on a pressure vessel is to safeguard the very design of the vessel so, u may choose to satisfy either of them....

regards,
ANG

 

[mechsarah]

Unfortunately no, if the vessel is designed to ASME VIII it will require an ASME VIII coded safety valve, however the SRV in question may or may not be duel certified to both standards.

Sarah