![Heatrae Sadia ELECTROMAX SOLAR Скачать руководство пользователя страница 20](http://html.mh-extra.com/html/heatrae-sadia/electromax-solar/electromax-solar_installation-and-servicing-instructions-manual_2117669020.webp)
20
Therefore the permitted length equates to: 5.8m
•
5.8m is less than the actual length of 7m therefore calculate the next largest size.
•
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a G1/2
•
temperature relief valve equates to 18m
Subtract the resistance of 4 No. 28mm elbows at 1.0m each = 4.0m
•
Therefore the maximum permitted length equates to 14.0m
•
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
•
TABLE 02:
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. number of elbows
or bends)
Resistance created
by each bend.
G1/2
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
1.7m
G1
28mm
35mm
42mm
54mm
up to 9m
up to 18m
up to 27m
1.4m
1.7m
2.3m
Fixed grating
Discharge below
fixed grating
(Building Regulation
G3 section 3.9d gives
alternative points
of discharge)
Trapped
gully
Discharge pipe (D2) from tundish,
with continuous fall. See Building
Regulation G3 section 3.9d i-iv,
Table 4 and worked example
300mm
minimum
500mm maximum
Metal discharge pipe (D1) from
Temperature relief valve to tundish
Tundish
Safety device
(e.g. Temperature
relief valve)
FIGURE 09: DISCHARGE PIPE ARRANGEMENT