Gas pressure
Gas pressure
(OP)
I have gas fired equipment operating at 7-11" wg and I sized the pipe for 1/2 psig pressure drop. My question is what is one pound of gas equal to in inches wg? There is a regulator on the downstream pipe of the gas meter.





RE: Gas pressure
to answer your question: 1 psig = 1.7298 "H2O
RE: Gas pressure
1" psig does not equal 1.7298" H2O. 1 foot (12 inches) very approximately) is equal to 1 psig
1 psig is equal to 27.7" of water.
put another way
1" of water equals 0.0361 psig.
You can make these conversions very easily by remembering 4 numbers. Taking standard atmospheric pressure as the datum:
1 atmoshpere = 14.7 psig
1 atmosphere = 407" H2O
1 atmosphere = 30" of mercury
1 atmosphere = 101,325 Pascals or bars
therefore 1psig = 407/14.7 = 27.69" H2O
RE: Gas pressure
RE: Gas pressure
My error -- glad that Accystan was watching -- as he points out the correct factor is 1" H2O = 0.0361 psi
(and my rule of thumb deals with inches Hg, not inches H2O)
My apoplogies...
RE: Gas pressure
Now. How many electrons are there in a cubic ohm.......?
Cheers
RE: Gas pressure
There are 2 in a cu ohm ...but if you let them out they become 8 because they are cubic ohms....I think!
RE: Gas pressure
RE: Gas pressure
0.5 inches water gage = 0.5 / 27.72 or
0.0180375 psi
RE: Gas pressure
RE: Gas pressure
Therefore pressure excerted by a ft ht of water per sq in = 62.34/144 = 0.4329 psi
height of water column corresponding to 1 psi therefore = 1/.4329 = 2.31 ft = 27.72"