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OSHA says acetylene must not be used at a pressure in excess of how many psig?

15 psig.

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  1. 50 psig
  2. 5 psig
  3. 15 psig ✔

Why: Acetylene becomes unstable and can decompose explosively at higher pressures. OSHA says under no condition shall it be used above 15 psig (103 kPa).

Huh, didn't know that: OSHA adds a 30 psia limit to keep acetylene out of pressurized spaces such as caissons and tunnels.

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References

Answer: 15 psig. Acetylene becomes unstable and can decompose explosively at higher pressures. OSHA says under no condition shall it be used above 15 psig (103 kPa).

  1. OSHA 29 CFR 1910.253 Oxygen-fuel gas welding and cutting www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.253
    Under no condition shall acetylene be generated, piped (except in approved cylinder manifolds) or utilized at a pressure in excess of 15 psig
    Checked 2026-10-10.

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