15
Installation instructions & user manual
T210023 v1.02 NOV 2018 - ZIP AP430S-AP4100S
Technical support
Tel: 0345 6 005 005 email: service@zipindustries .co.uk www.zipwater.co.uk
Valve 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
created by
each elbow or
bend
G1/2
15mm
22mm
up to 9m
0.8m
28mm
up to 18m
1.0m
35mm
up to 27m
1.4m
G3/4
22mm
28mm
up to 9m
1.0m
35mm
up to 18m
1.4m
42mm
up to 27m
1.7m
G1
28mm
35mm
up to 9m
1.4m
42mm
up to 18m
1.7m
54mm
up to 27m
2.3m
600mm
Maximum
Pipe Length
Safety device
e.g temperature
relief valve
Tundish
Metal Discharge Pipe (D2) From Tundish, with
Continuous Fall
Metal Discharge Pipe (D1) From Temperature
Relief Valve to Tundish, with Continuous Fall
Discharge Below
Fixed Grating
Trapped
Gulley
300mm
minimum
Discharge below fixed grating
(G3 3.62 gives alternative points of
discharge)
Note
The above chart is based on copper tube.
Plastic pipes may be of a different bore and resistance. Sizes and maximum lengths of plastic
should be calculated using data prepared for the type of pipe being used.
Discharge pipe arrangement
Note
The discharge would consist of high temperature water and steam. Asphalt, roofing
felt and non-metallic rainwater goods may be damaged by such discharges.
Note
It is not acceptable to discharge straight into a soil pipe. For guidance See G3 3.60.
Installation
Fig. 7
