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OSHA says an acetylene cylinder valve must not be opened more than how far?

One and one half turns.

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  1. Three full turns
  2. One and one half turns ✔
  3. All the way until it stops

Why: Opening the acetylene valve only a little keeps it easy to shut off fast in an emergency. OSHA prefers no more than three-quarters of a turn.

Huh, didn't know that: OSHA also says the cylinder valve shall always be opened slowly.

The dad joke
Open the acetylene valve slowly. It hates being rushed, just like dad at a buffet.
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References

Answer: One and one half turns. Opening the acetylene valve only a little keeps it easy to shut off fast in an emergency. OSHA prefers no more than three-quarters of a turn.

  1. 29 CFR 1910.253 Oxygen-fuel gas welding and cutting (Cornell LII) www.law.cornell.edu/cfr/text/29/1910.253
    An acetylene cylinder valve shall not be opened more than one and one-half turns of the spindle
    Checked 2026-10-10.

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