dp = 45 psig?

[tapetotape]

operating load = maximum instant demand = 200 mbtu/h, flow = 10,00 gpm, delta p = 45 psig (pipe size 20&quot
This is how the requirement appears for required supplied hot water to building and process ASH. Any easy way to convert this to psi? What is PSIG anyway? Temp in is (F) 200, out 160.

 

[hokie96]

I hope I understood your question correctly.

PSIG is gauge pressure in psi. Gauge pressure (in psi or psig - the units are identical) plus local atmospheric pressure equals absolute pressure in psi (or psia). Most times one must be careful to understand whether they're working in psia or psig.

The "g" in psig (or the "a" is psia) really has no meaning when talking about a differential pressure.

That said, if your looking to convert the psig to psi for your differential pressure, there's no more work to do. Your differential pressure is 45 psi.

 

[tapetotape]

thanks hokie.
that's what i thought and what i feared. they didn't account for enough pressure drop at point of use. now once again i have to tap dance around a pile of crap and convince the customer that he's smelling roses.