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This inspection shall include an air, CO2, or nitrogen pressure test, at which time the gas piping shall stand a pressure of not less than 10 psi (69 kPa) gauge pressure.
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As gas enters your home, its pressure is typically around.25 psi (pounds per square inch) or 1/4 of 1 pound of pressure. There is a gas-regulator beside the gas meter to control the gas pressure coming into your home. The regulator is typically round.
Gas lines need to be tested at 2.5 x the working pressure so never more than about 5lbs for residential gas. Gas lines must hold pressure forever. There should be no more than a couple inches WC change due to expansion. Any valves, fittings or gauges that leak need to be replace and the system needs to be re-tested.
Natural gas in the natural gas service line pressure in the gas main in the street will be found at pressures from 60 psi down to as low as 0.25 psi or about 7 inches of water column. Natural gas pressure at the gas meter: Depending on the application gas meters may operate at 7" w.c., 0.5 to 2.0 psig, or at pressures over 2.0 psig.
If you pump the gas line against the meter, even with the meter off, you run a risk of damaging the meter. Natural gas runs on very low pressure. 15 psi against the mechanisms of the meter can cause plenty of trouble. The method is to disconnect the pipe at the meter. Put the test gauge on there and pump it.
1213.3 Test Pressure This inspection shall include an air, CO 2, or nitrogen pressure test, at which time the gas piping shall stand a pressure of not less than 10 psi (69 kPa) gauge pressure.
gas line test – acceptable pressure drop. Installed the gas system (for low pressure – 1/2 lb gas service). Pressurized to minimum of 10 lbs pressure. System holds pressure with no acceptable drop for the required 15 minutes, but loses pressure at about 1lb/hour.
A liquid leak test (try Abbey leak detector or Sherlock Leak detector) is a more appropriate test for gas connections by a consumer. Also know this, the gas pressure inside the house is low, around 3 PSIG. The gas meter contains a regulator to reduce gas main pressures.
The gas pressure is low, on the order of 10 psi (usually measured in inches of water). I think I'd go 30-40psi to fill, troubleshoot each joint until you're satisfied, then valve it off and see what the reading is the next day. 11-02-2008, 05:01 PM #6