Riello DB4 SE C03 A180 FS2 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
D8903
8, 0
7, 2
6, 4
5, 6
4, 8
4, 0
3, 2
2, 4
1, 6
0, 8
0
Fig. 9
8
Head pressure drop
2000 4000
Pb (potenza bruciatore)
Butterfly valve pressure drop
1000 2000
Pb (Burner output)
2
CHAPTER
6000 8000
[kW]
DB4
DB3
4000 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 fol-
lowing conditions:
• pressure measured at the test
point on the pressure switch
downstream from the gas but-
terfly valve;
• combustion chamber at 0
mbar;
KW
• burner working at full output.
The pressure drop of the com-
pletely open butterfly valve is
given in Fig. 9.