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Gas appliances, flues and leaks questions for the Heating and plumbing services (HAPS) specialist test

5 free questions on Gas appliances, flues and leaks, from section E. Specialist: HVACR – heating and plumbing services. Every question is original and explains why each option is right or wrong.

Last verified against HSE guidance and the law ·How we write our questions

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Question 1

Easier ·Link to this question (question 1)

A school needs a new gas boiler fitted in its plant room.

Who may do the gas work?

Choose one answer.

  1. A. Whoever quotes the lowest price for the job
  2. B. A qualified Gas Safe registered engineer
  3. C. The school caretaker, if they have done it before
  4. D. Any heating apprentice, working alone
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. Choose on registration and qualification, not price.
  • B. Right: Right. HSE says in workplaces such as schools, work on gas fittings must be done by a Gas Safe registered engineer qualified for that work.
  • C. Wrong: Wrong. Schools need a Gas Safe registered engineer.
  • D. Wrong: Wrong. Schools need a qualified Gas Safe registered engineer.

Explanation

In schools, shops, offices and homes, gas work must be done by a qualified Gas Safe registered engineer.

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Question 2

Harder ·Link to this question (question 2)

You are working on gas pipework in a factory. Nobody lives on the premises.

What does HSE say about who may do the work?

Choose one answer.

  1. A. Anyone at all, as factories aren't covered
  2. B. Only the owner
  3. C. A competent person may do the work
  4. D. Nobody, as gas is banned in factories
Show the answer and explanation

Answer: C

  • A. Wrong: Wrong. The work must be done by a competent person.
  • B. Wrong: Wrong. The work must be done by a competent person.
  • C. Right: Right. HSE says in factories, mines, quarries and similar premises, a competent person may do gas work. Where those premises are used as living accommodation, a Gas Safe registered engineer is still needed.
  • D. Wrong: Wrong. Factories can have gas supplies.

Explanation

In factories (not used as living accommodation), gas work can be done by a competent person.

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Question 3

Medium ·Link to this question (question 3)

During a refit, a builder wants to box in a boiler flue to make the room look tidy.

What does HSE say?

Choose one answer.

  1. A. Box it in neatly
  2. B. It is fine if the boiler is only used in winter
  3. C. Fine with a window open
  4. D. Don't obstruct flues and chimneys
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. Flues must not be obstructed.
  • B. Wrong: Wrong. Flues must not be obstructed at any time.
  • C. Wrong: Wrong. Flues must not be obstructed.
  • D. Right: Right. HSE says don't block air inlets or obstruct flues and chimneys for gas appliances.

Explanation

Never obstruct flues, chimneys or air inlets for gas appliances.

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Question 4

Medium ·Link to this question (question 4)

A building owner asks what they must do about their gas heating once it is installed.

What does HSE say?

Choose one answer.

  1. A. Keep pipework, appliances and flues maintained
  2. B. Nothing, until something breaks or smells of gas
  3. C. Repaint the casing
  4. D. Rest it once a month
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE says gas pipework, appliances and flues should be regularly maintained.
  • B. Wrong: Wrong. Gas systems need regular maintenance.
  • C. Wrong: Wrong. Pipework, appliances and flues need maintenance.
  • D. Wrong: Wrong. Regular maintenance is what is needed.

Explanation

Gas pipework, appliances and flues should be maintained regularly by a competent person.

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Question 5

Medium ·Link to this question (question 5)

You suspect a leak on a heating system that runs on LPG from a tank.

Who should you phone after turning off the supply?

Choose one answer.

  1. A. The council
  2. B. The LPG supplier
  3. C. Nobody, as LPG leaks clear on their own outdoors
  4. D. The water company
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. For LPG, phone the LPG supplier.
  • B. Right: Right. HSE says if you suspect a leak, turn off the supply and phone the gas emergency service or, for LPG, your LPG supplier. If in doubt, evacuate.
  • C. Wrong: Wrong. Leaks must be reported straight away.
  • D. Wrong: Wrong. For LPG, phone the LPG supplier.

Explanation

Suspected LPG leak: turn off the supply, call the LPG supplier, and evacuate if in doubt.

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