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DISCHARGE ARRANGEMENT
Detailed discharge pipe installation requirement
The discharge pipework must be routed in accordance with part G3 of schedule 1 of the Building Regulations
The tundish should be vertical, located in the same space as the unvented hot water cylinder and be as close as possible
and within 500mm of the safety device e.g. the temperature relief valve.
The discharge pipe from the Tundish should be:
•
made of metal
•
at least one pipe size larger than the nominal outlet size of the safety device (larger sizes my be required if the equiva-
lent hydraulic resistance exceeds that of a straight pipe 9 metres long - refer to BS6700)
•
terminate in a safe place where there is no risk to persons in the vicinity of the discharge and positioned safely from
electrical devices
•
have a vertical section of pipe at least 300 mm long below the Tundish before any elbows or bends in the pipework
installed with a continuous fall
•
visible at both the tundish and the final point of discharge or where this is not possible or practically difficult there
should be clear visibility at one or the other of these locations.
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Valve outlet size
G1/2
<G3>/4
G1
Size of discharge
Size of discharge
pipework D1
15mm
22mm
28mm
Worcester Bosch Greenstore
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Maximum length of
straight pipe (no
pipework D2
bends or elbows)
22mm
28mm
35mm
28mm
35mm
42mm
35mm
42mm
54mm
Deduct the figure
below from the maxi-
mum length for each
bend or elbow in the
discharge pipe
up to 9m
0.8m
up to 18m
1.0m
up to 27m
1.4m
up to 9m
1.0m
up to 18m
1.4m
up to 27m
1.7m
up to 9m
1.4m
up to 18m
1.7m
up to 27m
2.3m
DISCHARGE ARRANGEMENT
5
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