Ariston ST 50 ProTech Istruzioni per l'installazione, la manutenzione e il funzionamento - Pagina 15
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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.
Temperature & pressure
relief valve
Metal discharge pipe (D1) from
temperature & pressure relief valve,
to tundlsh.
Tundish
500mm Max
300mm
MIn
Metal discharge pipe (D2) from tundlsh
with continuous fall. See Table 2 and worked
example.
Discharge below
fixed grating,
(see page 10 for
alternative points
of discharge).
Fixed grating
Fig. 3.10
Trapped gulley
Table 2. Sizing of copper discharge pipe "D2" for common temperature valve outlet sizes.
Valve outlet size
Minimum size of
discharge pipe D1*
Minimum size of
discharge pipe D2*.
from tundlsh
Maximum
resistance allowed,
expressed as a
length of pipe (i.e.
no elbow or bends)
Resistance created
by each elbow or
bend
G 1/2
15mm
22mm
28mm
35mm
Up to 9m
Up to 18m
Up to 27m
0.8m
1.0m
1.4m
G3/4
22mm
28mm
35mm
42mm
Up to 9m
Up to 18m
Up to 27m
1.0m
1.4m
V
1.7m
G 1
28mm
35mm
42mm
54mm
Up to 9m
Up to 18m
Up to 27m
1.4m
1.7m
2.3m
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