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

Linkback: https://forum.plumbers.nz/gas-exam-2006/20/question-8/146/