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QUESTION 8
(a) A gas installation that has several appliances is to be designed. State SIX factors to be considered
when determining the pipe sizes in the installation.
1
2
3
4
5
6
(3 marks)
(b) List SIX features to be considered in selecting a manual shut-off valve for a gas installation.
1
2
3
4
5
6
(3 marks)
(c) Explain why a gas pipe should not be used as a component of an earthing system.
(1 mark)
(d) State what should be installed to prevent a potential difference between a metal gas pipe and
earth.
(1 mark)
Total 8 marks