Page 417 - 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 6 Hot water systems

(c) Discharges at high level, onto a flat metal roof or other material
capable of withstanding the temperature of the water may be used
provided that any plastic guttering system is at least 3 m away from
the point of discharge to prevent damage to the guttering.
(d) Discharges at high level, into a metal hopper and metal downpipe may
be used provided that the end of the discharge pipe is clearly visible.
The number of discharge pipes terminating in a single metal hopper
should be limited to 6 to ensure that the faulty system is traceable.
(e) Discharge pipes that turn back on themselves and terminate against
a wall or other vertical surface should have a gap of at least 1 pipe
diameter between the discharge pipe and the wall surface.

D1 discharge pipe from the
temperature relief valve

600 mm max.

Tundish

D2 discharge pipework must have 300 mm
continuous fall of 1 in 200 minimum min.

100 mm max.

p Figure 6.50 The low-level termination of discharge pipework 1

D1 discharge pipe from the
temperature relief valve

600 mm max.

Tundish
The gap between
the discharge pipe
and the wall must
D2 discharge pipework must have 300 mm be 1 pipe diameter
continuous fall of 1 in 200 minimum min. minimum

p Figure 6.51 The low-level termination of discharge pipework 2

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