The average house line pressure for Natural Gas is

The average house line pressure for Natural Gas is

• A. 7\" W.C.
• B. 3.5\" W.C.
• C. 3.5 psi
• D. 7 psi

Answer: (A)

Gas pressure for residential natural gas is expressed in inches of water column (in wc), a very small pressure unit used for fuel-gas systems. The standard average house line pressure is about 7 inches of water column, which is roughly 0.25 psi. That’s the value most systems and appliances are designed to operate at, making it the correct choice. The other options are not typical for the average residential gas line. Half of the standard, 3.5 inches wc, is not the commonly used average. The psi options are far too high for home gas piping—since 1 psi equals about 27.7 inches wc, 3.5 psi or 7 psi would be hundreds of inches wc and far above normal residential supply.

Gas pressure for residential natural gas is expressed in inches of water column (in wc), a very small pressure unit used for fuel-gas systems. The standard average house line pressure is about 7 inches of water column, which is roughly 0.25 psi. That’s the value most systems and appliances are designed to operate at, making it the correct choice.

The other options are not typical for the average residential gas line. Half of the standard, 3.5 inches wc, is not the commonly used average. The psi options are far too high for home gas piping—since 1 psi equals about 27.7 inches wc, 3.5 psi or 7 psi would be hundreds of inches wc and far above normal residential supply.