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HS&E SAF practice question: Isolation and permits (3 of 5)

E. Specialist: HVACE – services and facilities maintenance A free question from our original HS&E SAF practice exam. Try it, then open the answer to see why each option is right or wrong.

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You are maintaining a hydraulic system and a compressed air system in a plant room.

What does HSE say about stored energy?

Choose one answer.

  1. A. Leave it, as the power is off
  2. B. Top it up before you start
  3. C. Only worry about the electricity, as pressure is harmless
  4. D. Release it before work starts
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. Stored energy can still move things.
  • B. Wrong: Wrong. That adds energy.
  • C. Wrong: Wrong. Stored pressure is a hazard too.
  • D. Right: Right. HSE says release any stored energy, such as compressed air or hydraulic pressure, that could cause the machine to move or cycle.

Explanation

Release stored energy, such as compressed air or hydraulic pressure, before maintenance.

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