Page 155 - 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 2 Common processes and techniques

a logbook, together with the results of any tests performed. Planned
preventative maintenance operations include:
● checking and repairing float-operated valves and setting water levels in
cisterns Gate valve Stop valve
● cleaning out cold water cisterns of all sediment as required
● routine boiler maintenance
● checking and re-washering taps as required
● routine testing of above-ground drainage systems Service valve Double check valve
● checking the operation of any safety valves
● checking the operation of all external controls and isolation valves,
including:
– stop taps
– gate valves Single check Motorised zone
– isolation valves valve valve
– motorised valves
– thermostats.
2 Breakdowns, repairs and emergencies: these are unplanned maintenance
activities that can occur at any time and include: Safety/relief Drain valve
● burst pipes valve
● boiler breakdowns
● running overflows
● blockages
● dripping taps
● WC cistern problems.
Radiator 3-port motorised
Drawing symbols of plumbing valves and valve valve
appliances M

Working drawings for plumbing and heating installations often contain symbols
that represent pipes, valves and appliances. It is important that these symbols
are recognised for systems to be installed properly. All symbols shown will be in Pump Water meter
accordance with BS 1192:2007.

SUMMARY

During this chapter, we have explored the tools required, the materials we use
and the installation practices we need to master to enable us to install good, Expansion Float-operated
valve
vessel
working systems that not only meet the requirements of the regulations, but p Figure 2.63 Plumbing symbols
also satisfy the customer’s needs and expectations. Good working practices drawings
at the start of your plumbing career will serve you well as you broaden your
experience, gain knowledge and improve your skills.

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