Gas Side Pressure Drops - Riello DB 12 SM C03 TC FS1 FB A0 Installation, Use And Maintenance Instructions

4.11

Gas side pressure drops

Gas pressure on the basis of the maximum output developed by
the burner is given by the curves in Fig. 6.
It represents the pressure drop in the combustion head.
Natural gas G 20 - N.C.V. = 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 output.
Combustion head pressure drop
Butterfly valve pressure drop
20119882
Technical description of the burner
3
100
90
80
70
60
50
m bar
40
30
20
10
0 2000
Pb (burner output)
18
16
14
12
10
m bar
8
6
4
2
Pb (burner output)
Add the pressure of the combustion chamber in
mbar to the value of the combustion head drop.
WARNING
The pressure drop of the completely open butterfly valve is given
in Fig. 7.
4000 6000 8000 10000
12 GB
D3978
12000 14000
[kW]
KW
D3979
[kW]
KW
Fig. 6
Fig. 7