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SESK: Stuff Everyone Should Know · sesk.info/epa-nitrogen-regulator-relief

When pressurizing a system with nitrogen, what does EPA's Core outline say to use with the cylinder?

A pressure regulator and a relief valve.

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  1. A refrigerant scale only
  2. A pressure regulator and relief valve ✔
  3. A vacuum pump in line

Why: EPA's Core safety topics call for a pressure regulator and relief valve with nitrogen. The regulator sets a safe test pressure, and the relief valve lets gas out if pressure climbs too high.

Huh, didn't know that: In one Lennox procedure, the nitrogen regulator is set to 160 psig to break a vacuum.

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Why was the diamond feeling very stressed? Because it had been under a lot of pressure.
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References

Answer: A pressure regulator and relief valve. EPA's Core safety topics call for a pressure regulator and relief valve with nitrogen. The regulator sets a safe test pressure, and the relief valve lets gas out if pressure climbs too high.

  1. Section 608 Technician Certification Test Topics, US EPA www.epa.gov/section608/section-608-technician-certification-test-topics
    Use of pressure regulator and relief valve with nitrogen
    Checked 2026-10-10.
  2. Lennox installation instructions 508844-01 www.lennox.com/dA/eb5bdb59f2/508844-01b.pdf
    nitrogen cylinder with pressure regulator set to 160 psig
    Checked 2026-10-10.

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