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://www.plumbers.nz/gas-exam-2006/20/question-8/146/