Page 603 - 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

3
1 m soakaway pit

1 m 5 m

1 m

p Figure 9.90 Soakaway

Appliance connections to existing below-ground
drainage systems
The method we use for connecting appliances to below-ground drainage
systems will depend on the appliance and the material that the below-ground
drainage pipework is made from.

Waste pipes up to 50 mm diameter
Appliances such as kitchen sinks, cleaners’ sinks and washbasins may
discharge direct into the back-inlet gulley of a below-ground drainage system.
The waste pipe must discharge below the grating but above the water line in
the gulley. This ensures an air break is maintained and that no smells can enter
the building.

WC connections to ground-floor drains
Where a WC is to be connected to a ground-floor drain, this can be simply done
by the use of a WC pan connector. Pan connectors are available in a number of
lengths and outlet sizes to suit 75 mm to 110 mm drainage systems, and to fit p Figure 9.91 WC pan connectors
both modern and existing WC pans.

Cesspits

In rural areas, many homes and villages are self-contained, and the combined
waste ends up in a local cesspit, septic tank or treatment plant. This has no
connection to the public sewer system and is known as off-mains.

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