SESK: Stuff Everyone Should Know · sesk.info/epa-low-pressure-nonmajor-0-psig
Non-major repair on a low-pressure appliance that won't be evacuated to atmosphere afterward. Pressurize to what before opening?
No higher than 0 psig, before opening it.
- No higher than 0 psig ✔
- 15 psig
- 25 mm Hg absolute
Why: For non-major repairs that won't end with evacuation to the atmosphere, EPA has you pressurize a low-pressure appliance to no higher than 0 psig before opening it.
Huh, didn't know that: EPA also says to cover openings when the part being repaired cannot be isolated.
Two muffins are sitting in an oven. The first one says, 'Man, it's really hot in here.' The second one says, 'Whoa, a talking muffin!'
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References
Answer: No higher than 0 psig. For non-major repairs that won't end with evacuation to the atmosphere, EPA has you pressurize a low-pressure appliance to no higher than 0 psig before opening it.
- 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
Be pressurized to a pressure no higher than 0 psig before it is opened if it is a low-pressure appliance
Checked 2026-10-10. - 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
Persons must cover openings when isolation is not possible.
Checked 2026-10-10. - 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
at 29.9 inches of mercury (standard atmospheric pressure)
Checked 2026-10-10.
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