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HS&E PLUM practice question: Water systems and legionella (4 of 6)

E. Specialist: Plumbing (JIB) A free question from our original HS&E PLUM practice exam. Try it, then open the answer to see why each option is right or wrong.

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A supervisor asks you to look for dead legs in an old system.

What is a dead leg?

Choose one answer.

  1. A. A pipe to an outlet that is rarely used
  2. B. A pipe that carries only waste water
  3. C. A pipe that has been lagged to stop it freezing
  4. D. A pipe with a frozen section
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE describes a dead leg as a pipe to an outlet that water flows through, but the outlet is unused or rarely used. Water stagnates there.
  • B. Wrong: Wrong. That is a waste pipe.
  • C. Wrong: Wrong. Lagging doesn't make a dead leg.
  • D. Wrong: Wrong. A dead leg is about water that rarely moves.

Explanation

A dead leg is a pipe to an outlet that is rarely used, so the water in it stagnates.

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