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Steam pressure vs temperature

Steam pressure vs temperature

(OP)
Gents,
a heat exchanger is to be supplied with steam at 147 psig and (363F) from higher steam source @429 psig& 456 F through pressure control valve,
my question what will be practically the temperature downstream the pressure control valve, since there's no heat exchange? is it as per the steam table 147 psig correspond to 363F.
Regards

RE: Steam pressure vs temperature

No, it is pretty close to the source temp of 456F. You might get some JT cooling, but this is a pretty small dP. The LP steam will be superheated, not saturated so the saturated steam table doesn't have much relevance.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

RE: Steam pressure vs temperature

Estimate this to be at 405degF downstream of the PCV at 147psig (still superheated), so you have to desuperheat another 42degF to reach saturation temp of 363degF.

RE: Steam pressure vs temperature

(OP)
What kind of solution to desuperheat the steam and achieve 363 F.
Regards.

RE: Steam pressure vs temperature

Here is a sample vendor offering desuperheater nozzles - there are some others also which you can find on the net.

http://www.spiraxsarco.com/Documents/Desuperheatin...


You may wish to buy the desuperheater nozzle only from this vendor and fix up the PCV and TCV and piping yourself if that suits you.

RE: Steam pressure vs temperature

(OP)
Thanks a lot georgeverghese

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