Ariston AQUABRAVO ITSI 255 Instrukcje instalacji, serwisowania i użytkowania - Strona 15
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Drukuj stronęTemperature & pressure
relief valve
F
. 3.11
iG
t
2. Sizing of copper discharge pipe "D2" for common temperature valve outlet sizes.
ABle
Valve outlet size
G 1/2
G 3/4
G 1
The single common discharge pipe should be at least one pipe
size large than the largest individual discharge pipe to be
connected. If unvented hot water storage systems are installed
where discharges from safety devices may not be apparent i.e. in
dwellings occupied by the blind, infirm or disabled people,
consideration should be given to the installation of an
electronically operated device to warn when discharge takes
place.
Note: The discharge will consist of scalding water and steam.
Asphalt, roofing felt and non-metallic rainwater goods may be
damaged by such discharges.
Metal discharge pipe (D1) from
temperature & pressure relief valve.
to tundish.
600mm Max.
300mm
Min.
Metal discharge pipe (D2) from tundish
with continuous fall. See Table 2 and worked
example.
Minimum size of
Minimum size of
discharge pipe D1*
discharge pipe D2*
from tundish
15mm
22mm
28mm
Tundish
Maximum
resistance allowed,
expressed as a
length of pipe (i.e.
no elbow or bends)
22mm
Up to 9m
28mm
Up to 18m
35mm
Up to 27m
28mm
Up to 9m
35mm
Up to 18m
42mm
Up to 27m
35mm
Up to 9m
42mm
Up to 18m
54mm
Up to 27m
Discharge below
fixed grating.
(see page 10 for
alternative points
of discharge).
Fixed grating
Trapped gulley
Resistance created
by each elbow or
bend
0.8m
1.0m
1.4m
1.0m
1.4m
1.7m
1.4m
1.7m
2.3m
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