Gas Side Pressure Drop - Riello DB 20 SM HS C03 TC A0 FS1 FB T150 Installation, Use And Maintenance Instructions

4.9

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.
Combustion head pressure drop
70
65
60
55
50
45
40
35
30
25
20
15
10
5
Butterfly valve pressure drop
26
24
22
20
18
16
14
12
10
8
6
4
2
0
0
Technical description of the burner
3
0 2000 4000 6000 8000
Pb (Burner output)
2000 4000 6000 8000
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. 5.
10000 12000 14000 16000 18000
[kW]
G31
(DB16)
10000 12000 14000 16000 18000
[kW]
11 GB
D3890
G31
G25
G20
20000 22000
D3891
G25
(DB20)
G25
(DB16)
G20
G20
(DB16)
(DB20)
G31
(DB20)
20000 22000
Fig. 4
Fig. 5
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