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.
inches wg refers to inches water gauge -- and I am assuming that you mean psi (pounds per sq in) when refering to a pound of gas: use the standard formula 1" H20 = 0.5781 psi (when estimating I usually use a rule of thumb that 1" H20 is roughly equivalent to ½ psi -- recognizing that it is only a very rough estimate)
to answer your question: 1 psig = 1.7298 "H2O
With all due respect I think that pablo02 is mistaken.
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:
I agree in concept -- I should have left off the "g", my error (or added 'wg' to my answer) -- however, the question dealt with inches water gauge which is also a measurement above atmopheric pressure therefor the value is still valid if you disregard my error in units...