Page 633 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 9 Sanitation systems

8 Where a branch connection into a stack is between 82 mm and 160 mm
in diameter (e.g. a WC branch), no other connection is allowed to be
installed within which of the following distances vertically downwards?
a 90 mm
b 110 mm
c 200 mm
d 250 mm
9 Which of the following British Standards offers specific guidance on the
space requirements for sanitary appliances?
a BS 6465–2
b BS 3943
c BS 12056–2

d BS 4305
10 What is the cause of loss of trap seal in the image on the right?
a Self-siphonage
Loss of
b Compression seal
c Evaporation depth
d Capillary action
11 What hazards are involved in the removal of a cast iron bath from an
existing bathroom?
12 What are the maximum flush limits for toilet cisterns for both long and
short flushes?
13 Explain the purpose and operation of the component in the image on the
right.
14 Give at least three advantages of the waterless (self-sealing) trap.
15 A 32 mm diameter waste pipe is to be installed from a wash hand basin.
The length of the branch is 1.5 m, what is the recommended gradient in
mm/m?

Practical activity
Ask your tutor, or perhaps your supervisor on-site, if you could try installing
a trap to a basin (or other appliance). First, you will need to install a suitable
waste to the basin to allow for the trap to be connected. Select a suitable
trap for the appliance and connect the trap and waste. Be careful not to
damage the appliance, which could easily be chipped or marked if not
handled carefully.

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