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Toolbox Talks

Test the air before you go in

Test the air before you go in

Confined space 5 min 29 CFR 1926.1203 · 29 CFR 1926.1204

Plumbing, HVAC

Why it matters

The air in a confined space can be short of oxygen, or it can hold a gas you cannot smell. Rust, sewage, solvents, and welding all change that air. Your nose will not tell you it is safe. The competent person tests before anyone goes in, and keeps testing the way the permit says.

The talk

The air in a confined space can hurt you before you feel a thing. It can be short of oxygen. It can hold a gas you cannot smell. Rusting steel uses up oxygen in a closed tank. Sewage in a manhole puts gas in the air. Solvents from a glue, a cleaner, or a coating sit in a pit and do not leave on their own. Welding and cutting inside a space, or right at the opening, change the air too. None of that waits until you feel dizzy. The space can look clean and still be a bad place to breathe. The rules that put a program around this are 1926.1203 and 1926.1204.

The competent person tests the air before anyone goes in. The test happens again the way the permit says, not when somebody happens to remember. Do not trust your nose. Plenty of gases have no smell, and a smell is not a test. A space that smells fine is not a space that passed. If the test has not been done, you stay out. If the permit says to test again after a break, you do not skip that test because you were only gone a little while. The meter is the check. Your nose is not.

Do not enter to rescue a coworker. That is how a second person dies. You saw them go down, or you heard them stop answering, and you want to climb in. Do not. Call for help and use the rescue plan. The plan is there so the next person is not another victim. A ventilation fan is not a reason to skip the test. A fan can help after the test shows what the air is doing. A fan does not replace the test, and it does not make it safe to chase a partner into a tank. You stay out. You call. You follow the plan.

Key points

  1. Confined-space air can be short of oxygen or can hold a gas you cannot smell.
  2. Rust, sewage, solvents, and welding all change the air.
  3. The competent person tests before entry and keeps testing as the permit says.
  4. Do not trust your nose.
  5. Do not enter to rescue a coworker.
  6. Call for help and use the rescue plan.
  7. A ventilation fan is not a reason to skip the air test.

Do this

  • Wait for the competent person to test the air before anyone enters.
  • Test again the way the permit says, including after a break if it says so.
  • Treat a space that smells fine as untested until the meter is used.
  • Call for help and follow the rescue plan if a coworker goes down.
  • Use a fan only as the permit allows, not in place of a test.

Do not do this

  • Do not trust your nose to decide the air is safe.
  • Do not enter a confined space before the air test.
  • Do not skip a retest because you only stepped away for a little while.
  • Do not climb in to rescue a coworker.
  • Do not treat a running fan as a passed air test.

Talk about it

  1. What on this job could change the air: rust, sewage, solvents, or welding?
  2. Who tests the air, and when does the permit say to test again?
  3. If someone inside stops answering, what do we do instead of climbing in?

This is a short crew briefing. It does not replace a competent person, training, or the law.

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