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ASME Section I or ASME Section VIII? For Sizing Safety Valves

ASME Section I or ASME Section VIII? For Sizing Safety Valves

ASME Section I or ASME Section VIII? For Sizing Safety Valves

(OP)
Hi

Help, I'm a doubt,

For sizing safety valves I have this conditions;
The valves are installed on in-plant process, piping system.
Service = High Pressure Steam "Heater",
Normal Flow = 579 t/h, (the same one or similar to relief, scenario by back-flow or shutdown process)
Opn Pressure = 870 psig
Opn Temp = 906°F,
Set Pressure = 942 psig, (this one is in the first place, maybe we have need 3 safety valves)
Desig Temp = 946°F,
MAWP or Design Pressure of Piping System = 1,163 psig,

What code is requered? ASME section I or ASME section VIII

Thanks


RE: ASME Section I or ASME Section VIII? For Sizing Safety Valves

If you are outside of the first primary block valve of the boiler (is your steam heater classified as such?) then you are still in B31.3 / ASME VIII scope.

But...

By "steam heater", is the steam heating something or is the steam being heated by something? 870 psig at 906 F is about 376 F of superheat if I am reading my Steam Table app correctly.

If those are the conditions I am inclined to say ASME I.

RE: ASME Section I or ASME Section VIII? For Sizing Safety Valves

(OP)

Ok , thanks SNORGY.

Excuse me,

The complete word is super-heater, STEAM SUPER-HEATER,

The valves are installed far away and outside of the boiler battery,

Sizing by
1. upset on the cogeneration plant ( supplier of steam super-heater)
2. Back-flow by customers (back-flow of processes units or consumers of steamm, shutdown, failures of processes,)

Objetive: Provide positive overpressure protection to piping system (steam header)

Thanks

RE: ASME Section I or ASME Section VIII? For Sizing Safety Valves

If the heater was designed and stamped to ASME VIII,1 your PRV will be UV or V but if designed to I, PRV must be V. If it is outside the scope of the ASME, check your Jurisdiction to see if allowes otherwise.

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