Riello DB 4 SM BLU Installation, Use And Maintenance Instructions page 28

2.6 Gas side pressure drop
D8257
60
50
40
m bar
30
20
10
0 1000
Fig. 8
D8258
26
24
18
m bar
12
6
0 1000
Fig. 9
8
Head pressure drop
2000 4000
Pb (Burner output)
Butterfly valve pressure drop
2000 4000
Pb (Burner output)
2
CHAPTER
KW
6000 8000
[kW]
6000
KW
[kW]
Burner description
Gas pressure on the basis of
the maximum output developed
by the burner is given by the
curves in Fig. 8.
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. 9.