Gas Side Pressure Drop - Riello DB 4 SE FGR Installation, Use And Maintenance Instructions

3.9

Gas side pressure drop

Gas pressure on the basis of the maximum output developed by
the burner is given by the curves in Fig. 4.
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.
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. 5.
Technical description of the burner
3
11 GB
Combustion head pressure drop
120
100
80
60
40
20
Burner output Pb [kW]
Butterfly valve pressure drop
8, 0
7, 2
6, 4
5, 6
4, 8
4, 0
3, 2
2, 4
1, 6
0, 8
0 1000 2000
Burner output Pb [kW]
KW
Fig. 4
DB4
D8903
DB3
4000 6000
KW
Fig. 5
20169009