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Regulator – inspection & testing

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  • 1. Regulator – Inspection & Testing
    Service Regulator
    • Service Regulator & Meter Set Inspection
    • 2. Regulator Flow, Lock-up and Leak Tests
  • 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)
  • 3. 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.
  • 4. 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.
  • 5. Regulator – Inspection & Testing
    Common Set Pressures
    • 7” W.C. (1/4” psig)
    • 6. 14: W.C. (1/2 psig) < WPS only
    • 7. *2 psig (56” W.C.)
    • 8. *5 psig (commercial customers)
    * requires additional regulator on
    customer piping system
  • 9. 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
  • 10. Regulator – Inspection & Testing
    Test Procedures
    Perform flow, lock-up and leak test per
    company procedures and manufacturers
    requirements.
  • 11. 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.
  • 12. 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.
  • 13. 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.
  • 14. Regulator – Inspection & Testing
    Set Flow Pressure to the following:
    • 7” W.C. system: 7” @ 50 SCFH
    • 15. 14” W.C. system: 14” @ 50 SCFH
    • 16. 2 PSIG system: 2psig (56”) @ 50 SCFH
    Note: 50 SCFH = 50,000 BTU/HR
  • 17. 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.
  • 18. Regulator – Inspection & Testing
    Lock-up Pressure should not exceed:
    • 7” W.C. system: Lock-up @ 10” W.C.
    • 19. 14” W.C. system: Lock-up @ 17” W.C.
    • 20. 2 psig system: Lock-up @ 2.3 psig (64’ W.C.)
  • 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.
  • 21. Regulator – Inspection & Testing
    Acceptable Pressure Reached
    • 7” W.C. system: pressure should remain
    @ 5-6” W.C.
    • 14” W.C. system: pressure should remain
    @ 9-10” W.C.
    • 2 psig system: pressure should remain
    @ 30-40” W.C.
  • 22. 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.
  • 23. 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.
  • 24. 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.
  • 25. Regulator – Inspection & Testing
    Records Completion
    • Complete Regulator & Safety Device
    Inspection Record
    • Complete Gas Meter Record