Page 605 - 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

● The condense pipe should be made of a proprietary drainpipe material, such
as PVCu, ABS, PP or PVC.
● Metal pipework of any kind is not acceptable due to the acidic nature of the
condensate.
● The pipework must be at least 21.5 mm diameter and fully supported with
suitably spaced clips to prevent sagging.
● The pipe must be installed to a minimum angle of fall of at least 2.5° or
50 mm in every 1 m.
● The length of pipe should not exceed 3 m.
● External runs should be a short as possible, and a minimum of 32 mm
diameter waste pipe.
● External pipework must be protected against freezing by insulation of an
appropriate thickness along its entire run.
● Connections to rainwater drains are not permitted unless the rainwater drain
connects to a foul drain.
● Since most combination boilers contain a 75 mm condensate trap, external
traps are not required unless the boiler manufacturer states otherwise.
Manufacturers’ data should be checked before the installation of condense
pipework. Manufacturers’ data should be checked before the installation of
condense pipework.

Internal
soil pipe

Pipe must be insulated.
Condense pipework It must terminate above
Min. 2.5° fall the water level but below
Condense pipework the surrounding surface.
Min. 2.5º fall Pipe end cut to 45°
Trap installed
if required

p Figure 9.92 Termination to a soil stack p Figure 9.93 Termination to a drain or gulley

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