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816 Confined Space Safety in Construction
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If a Hazard is Detected

It's important to immediately evacuate the space if any kind of hazard is detected.

If a hazard is detected in the confined space, entrants should evacuate immediately.

If a hazard is detected during entry or work be sure to do the following:

  • Make sure all employees leave the space immediately (no exceptions).
  • Evaluate the space to see how the hazard developed.
  • Take measures to protect employees and eliminate the hazard.
  • Do not allow reentry until the hazard is completely eliminated.

It's important to understand that control of atmospheric hazards through forced air ventilation does not constitute elimination or isolation of the hazards unless the employer can prove that forced air ventilation alone will control all hazards in the space.

Safe Entry Methods

Make sure a safe method of entering and exiting the space is used. If a hoisting system is used, it must be designed and manufactured for personnel hoisting; however, a job-made hoisting system is permissible if it is approved for personnel hoisting by a registered professional engineer, in writing, prior to use.

Knowledge Check Choose the best answer for the question.

3-11. What should you do if a hazard is detected during entry or work?