Page 600 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

Foaming

Foaming is a direct result of too much detergent (soap) being used. The
excessive foam can back up waste pipes and soak away the water in the trap.
It can usually be detected by the appearance of foam emerging from traps in
appliances.

Sanitary pipework systems, positioning

fixing, connection and operation of
components

This subject was covered in detail in Chapter 2, Common processes and
techniques, which covers the installation of all pipework within a dwelling. There
are, however, components and systems that are specific within sanitation and
these are discussed in the sections that follow.

Suitability of below-ground drainage

systems

A below-ground drainage system takes the soiled water away from the dwelling
and deposits it into a main sewer in the road. From here it will flow to the
sewerage plant. The systems of below-ground drainage are:

● the separate system
● the combined system
● the partially separate system (sometimes called the partially combined
system)
● soakaways
● cesspits
● septic tanks.

The separate system

This is the system favoured by local authorities. With this system, foul water
and rainwater flow into separate drainage systems. These are then connected
to a separate foul water sewer and surface water drain in the road. The foul
water from WCs, baths, washbasins and kitchen sinks is conveyed to the sewage
treatment plant and the rainwater flows to the nearest watercourse. The layout
of the design is shown in Figure 9.87.

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