QUESTION 2
(a) State THREE processes by which iron gas pipes can be corroded.
 1
 2
 3
(3 marks)

(b) Explain TWO methods of preventing corrosion of iron pipes.
 1
 2
(4 marks)

(c) Explain TWO ways a copper gas pipe can be protected when laid under a concrete slab floor.
 1
 2
 (2 marks)

(d) State TWO essential features of supports for gas pipework running overhead through a building.
 1
 2
 (2 marks)
Total 11 marks

Linkback: https://www.plumbers.nz/gas-exam-2006/20/question-2/152/