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Posted by Boeid on June 13, 2012 at 23:29:14:
In Reply to: Re: Boiler press vs line press posted by Kevin DiLuigi on November 22, 2011 at 20:09:47:
: Your superheating the steam in opposite fashion then how it is normally done. By lower the pressure without reducing the heat the steam is above it's boiling point. It can now drop in temperature through pipe travel without forming water. Less loss at the end.
I agreed with Kevin, assuming that it is saturated steam, at 100 psig, its saturation temperature is 164 Celsius with Steam Enthalpy of 2762 kJ/kg.
Lowering its pressure through pressure reducing valve is an isenthalpic process (constant enthalpy) and from Steam Table (or program) for steam with 60 psig and 2762 kJ/kg will give its temperature at 161 Celsius which is about 17 Celsius superheat (saturation temperature for 60 psig is 144 Celsius).
By having superheated steam, it will avoid/minimize condensation throughout the distribution line.
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