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QUESTION 5
(a) AS/NZ 3500.0 Glossary of terms gives a full definition of the term ‘Work of Drainlaying’.
State what this definition covers.
(4 marks)
(b) Give TWO reasons why it is important to ensure that a sewer drain has leak-proof joints.
1
2
(2 marks)
(c) Define the following tests for drainage systems.
(i) Hydrostatic test
(1 mark)
(ii) Dye test
(1 mark)
(d) When a drain or part of a drain is no longer required, it shall be disconnected from the foul
water drainage system.
(i) State the position where the drain must be disconnected.
(1 mark)
(ii) State what the Drainlayer must use to seal this disconnection.
(1 mark)
(iii) State TWO effects that the unsatisfactory disconnection of old branch drains from live
drains may have on the drainage system.
1
2
(2 marks)
(e) (i) State TWO functions of gullies in relation to a foul water drainage system.
1
2
(2 marks)
(ii) State TWO locations where an overflow relief gully shall be installed.
1
2
(2 marks)
(iii) State the maximum height for the riser to a gully trap.
(1 mark)
(iv) State the TWO points from where the gully trap riser measurements are taken.
1
2
(1 mark)
Total 18 marks