18
WARNING!
The discharge will consist of scalding water and
steam. Asphalt, roofing felt and non-metallic rainwater goods may
be damaged by such discharges.
SIZING OF COPPER DISCHARGE PIPE “D2” FOR COMMON
TEMPERATURE RELIEF VALVE OUTLET SIZES
Valve outlet
size
(diameter,
inches)
Min size of
discharge
pipe D1
(mm)
Min size of
discharge
pipe D2
from
tundish
(mm)
Max
resistance
allowed,
expressed
as a length
of straight
pipe, i.e. no
elbows or
bends
Resistance
created by
each elbow
or bend (m)
15
22
28
35
up to 9
up to 18
up to 27
0.8
1.0
1.4
22
28
35
42
up to 9
up to 18
up to 27
1.0
1.4
1.7
28
35
42
54
up to 9
up to 18
up to 27
1.4
1.7
2.3
Worked example
The example below is for a ”diameter temperature relief valve
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