Which statement is true regarding natural gas pressure for typical household service?

Which statement is true regarding natural gas pressure for typical household service?

• A. 7 psi
• B. 7" W.C.
• C. 7 inHg
• D. 70 psi

Answer: (B)

Natural gas pressure for a typical household service is measured in inches of water column, not in psi or inches of mercury, because the flow and safe operation of gas appliances rely on very low pressures. The standard residential service pressure is about 7 inches of water column, which is roughly 0.25 psi. This low pressure is enough to feed appliances without overpressurizing piping. Pressures expressed as psi (7 psi or 70 psi) would be far too high for home gas systems, and using inches of mercury (inHg) is a different unit that doesn’t match the usual gas-service measurements. So the statement that residential natural gas service uses about 7 inches of water column is the correct one.

Natural gas pressure for a typical household service is measured in inches of water column, not in psi or inches of mercury, because the flow and safe operation of gas appliances rely on very low pressures. The standard residential service pressure is about 7 inches of water column, which is roughly 0.25 psi. This low pressure is enough to feed appliances without overpressurizing piping. Pressures expressed as psi (7 psi or 70 psi) would be far too high for home gas systems, and using inches of mercury (inHg) is a different unit that doesn’t match the usual gas-service measurements. So the statement that residential natural gas service uses about 7 inches of water column is the correct one.