Riello DB4SMC01 AO FS1 T150 Installation, Use And Maintenance Instructions page 31

2.6 Gas side pressure drop
D7541
50
40
30
mbar
20
10
Fig. 11
D8328
20
18
16
14
12
10
8
mbar
6
4
2
0 1000
Fig. 12
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Head pressure drop
Pb (Burner output)
Butterfly valve pressure drop
2000 4000
Pb (Burner output)
2
CHAPTER Burner description
[kW]
KW
6000 8000 KW
[kW]
Gas pressure on the basis of
the maximum output developed
by the burner is given by the
curves in Fig. 11.
It represents the pressure drop
in the combustion head.
Natural gas G 20 - Net calorific
3
value = 10 kWh/Nm
The curves were taken in the
following conditions:
• pressure measured at the
test point on the pressure
switch downstream from the
gas butterfly valve;
• combustion chamber at 0
mbar;
• burner working at full out-
put.
The pressure drop of the com-
pletely open butterfly valve is
given in Fig. 12.
9