CNG Relief Valve Recertification or Replacement
Were you aware that the pressure relief valves throughout your compressed natural gas station need to be replaced or recertified every three (3) years?
That’s right; according to NFPA-52 section 188.8.131.52.3 Pressure relief valves shall be tested and recertified at least every 3 years. ASME code pressure relief valves shall be tested in accordance with NB-514, Accreditation of “VR” Repair Organizations.”
The Ingersoll Rand CNG compressors, models 05H20, 05H25 and 20H40 each have four safety relief valves; one for each stage of compression.
05H20 and 05H25 RELIEF VALVE LIST
Part Number NGV-ING 32244691 • First Stage Relief Valve – 95 PSIG
Part Number NGV-ING 32244709 • Second Stage Relief Valve – 400 PSIG
Part Number NGV-ING32270290 • Third Stage Relief Valve – 1600 PSIG
Part Number NGV-ING 32270308 • Fourth Stage Relief Valve – 5800 PSIG
20H40 RELIEF VALVE LIST
Part Number NGV-ING 32270373 • First Stage Relief Valve – 200 PSIG
Part Number NGV-ING32270381 • Second Stage Relief Valve – 800 PSIG
Part Number NGV-ING 32270399 • Third Stage Relief Valve – 2400 PSIG
Part Number NGV-ING32270308 • Fourth Stage Relief Valve – 5800 PSIG
There are also pressure relief valves located on IR recapture tanks and the Inlet pulse bottle. Call us for these part numbers.
Check the tags on all these valves to make sure you are in compliance. Call us at 877-244-4883 if you need to replace or recertify.