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cage or similar guard is positioned to prevent contact, whilst maintaining visibility;
and
(d) discharges at high level: e.g. into a metal hopper and metal downpipe with the
end of the discharge pipe clearly visible or onto a roof capable of withstanding high
temperature discharges of water and 3m from any plastic guttering system that would
collect such discharges.
3.63 The discharge would consist of high temperature water and steam. Asphalt, roofing
felt and non-metallic rainwater goods may be damaged by such discharges.
600mm maximum
300mm minimum
temperature relief valve to tundish
Metal discharge pipe (D2) tundish with
continuous fall. See 3.56, Table G3 and
worked example
Tundish
Discharge below fixed
grating (3.61 gives
alternative points of
discharge)
Fixed grating
Trapped gulley
V a l v e
outlet
size
Minimum size of
discharge pipe D1
Minimum size of
discharge pipe D2
from tundish
Maximum resistance
allowed, expressed
as a length of straight
pipe (i.e. no elbows or
bends)
Resistance crea-
ted by each elbow
or bend.
15mm
22mm
28mm
35mm
Up to 9m
Up to 8m
Up to 27m
0.8m
1.0m
1.4m
22mm
28mm
35mm
42mm
Up to 9m
Up to 8m
Up to 27m
1.0m
1.4m
1.7m
G1 28mm
35mm
42mm
54mm
Up to 9m
Up to 8m
Up to 27m
1.4m
1.7m
2.3m
Figure G3: Typical discharge pipe arrangement
Table G3 – Sizing of copper discharge pipe ‘D2’ for common temperature relief valve outlet sizes
UK
Smart SL-SLEW : A1007850 - 661Y1700 • F - draft
Installation
EN
22
22


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