Regulator – Inspection & Testing Service Regulator A device that controls the pressure of gas from the service line pressure (usually 60 psig) to the reduced pressure ultimately delivered to the customer. (usually 7” W.C. or 2 psig)
Regulator – Inspection & Testing Lock-up The pressure at which a regulator remains under a no-flow or no-load condition. This lock-up pressure is always slightly above the set pressure.
Regulator – Inspection & Testing Set Pressure The pressure a regulator is adjusted to deliver for the required pressure for the specific load or system. This pressure is measured between the outlet connection of the regulator and the inlet connection of the meter.
Regulator – Inspection & Testing Common Set Pressures
* requires additional regulator on customer piping system
Regulator – Inspection & Testing When are they required?
When meter is newly installed, tested,
or changed (periodic meter change)
When replacing meter assembly(meter set)
Regulator – Inspection & Testing Inspection
Inspect general overall condition of
entire meter set
Inspect discharge vent on outside regulators
and discharge vent piping from inside meter sets
Regulator – Inspection & Testing Test Procedures Perform flow, lock-up and leak test per company procedures and manufacturers requirements.
Regulator – Inspection & Testing Remove Meter Note: This step does not apply to a new meter installation. Close riser valve and using a 14” pipe wrench remove the meter from the meter connections on your meter set. Discard meter gaskets.
Regulator – Inspection & Testing Flow Testing 1. Select the appropriate test device to use on your system depending on your set/delivery pressure. 2. Attach the test device to the inlet meter swivel. Make sure the test device’s valve is closed. The seal at the meter collar/swivel must be gas tight, as this will affect the leak test.
Regulator – Inspection & Testing Flow Testing 3. SLOWLY open the riser valve to the full open position. 4. Open the test device’s valve. Adjust the set pressure per company requirements. Note: Adjust the regulator clockwise to increase flow pressure, and adjust counter-clockwise to decrease flow pressure.
Regulator – Inspection & Testing Set Flow Pressure to the following:
Regulator – Inspection & Testing Lock-up Testing Close the test device’s valve. The riser valve should still be in the fully opened position. Continue to observe the test device for a 3 minute period. The regulator lock-up pressure should not exceed your company’s requirements.
Regulator – Inspection & Testing Lock-up Pressure should not exceed:
Regulator – Inspection & Testing Meter Assembly Leak Testing Shut off the riser valve. While observing the test device, bleed a small amount of gas at the test device’s valve until an acceptable pressure is reached. Observe the test device for at least 1 minute. A drop in pressure indicates leakage between the test device and the riser valve. An increase in pressure indicates a leak through the riser valve.
Regulator – Inspection & Testing Riser Valve Leak Testing The riser valve must remain closed. Bleed the remaining gas out of test device until the test device is zero. Observe the test device for at least 1 minute. If pressure stays constant, the riser valve is not leaking. If the pressure increases, the riser valve is defective and needs repair or replacement.
Regulator – Inspection & Testing Internal Relief Valve Testing (WPS only) The riser valve must remain closed. Blow pressure back into the outlet of the regulator. Two tests are required on regulators set for 14” W.C. or less. On the first try, the internal relief should open at 35” W.C. or less. This is the ‘as found’ condition. On the second try, the internal relief should open at 23” W.C. or lower. This is the ‘as left’ condition.
Regulator – Inspection & Testing Restoration of Customer Service After completion of all tests, replace the old meter gaskets and reconnect meter to assembly. Always apply anti-seize compound to the meter threads prior to connection. Purge air out of meter prior to making the outlet meter connection. Tighten meter connections with a 14” pipe wrench and soap test all connections for possible leakage.
Regulator – Inspection & Testing Records Completion