Page 621 - 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

ACTIVITY

Calculation of thermal expansion
Using the method shown in the worked example above, calculate the following:
1 A south-facing soil and vent pipe 15 m high is subjected to a 15°C
temperature rise. What is the expansion of the pipe when the coefficient of
linear expansion is 0.06 mm/m/°C? INDUSTRY TIP
2 A south-facing waste pipe 10 m long is subjected to a 30°C temperature
rise. What is the expansion of the pipe when the coefficient of linear To counteract the expansion,
expansion is 0.06 mm/m/°C? push-fit soil and vent pipe
3 A south-facing soil and vent pipe 5 m long is subjected to a 20°C should be withdrawn 10 mm.
temperature rise. What is the expansion of the pipe when the coefficient of This will also prevent joint
linear expansion is 0.06 mm/m/°C? failure.

The procedure for notifying works carried
out to the relevant authority

Once an installation is finished, the appropriate commissioning form should
be completed and, if an installer is not part of a self-certification scheme,
then the Local Authority Building Control (LABC) department should be
informed.
However, if you are a member of a certification scheme and you have completed
your commissioning paperwork, you have 30 days to submit your details. It
is important to keep a record of all the tests that you have carried out as this
will help in the event of a query at a later date, and will help you diagnose any
problems that may have occurred since the installation. Invariably, you will also
be installing sanitary fittings so the forms shown in Figures 9.109–9.111 may
require completion.

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