Riello DB9 LSE C13 TC FS1 A0 Installation, Use And Maintenance Instructions page 31

2.6 Gas side pressure drop
Fig. 8
D3978
100
90
80
70
60
50
m bar
40
30
20
10
0
Fig. 9
D3979
18
16
14
12
10
m bar
8
6
4
2
2000 4000 6000 8000
Pb (Burner output)
Butterfly valve pressure drop
Pb (Burner output)
2
CHAPTER Burner description
Head pressure drop
10000 12000 14000
[kW]
KW
[kW]
KW
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;
• burner working at full output.
The pressure drop of the com -
pletely open butterfly valve is
given in Fig. 9.
9