Riello DB 16 SM C01 TC A0 FS1 T250 Installation, Use And Maintenance Instructions page 28

2.6 Gas side pressure drop
280
m bar
260
240
220
200
180
160
140
120
100
80
60
40
20
Fig. 8
26
24
22
20
18
16
14
12
10
m bar
8
6
4
2
0
0 2000 4000
Fig. 9
8
G 31 ( DB16)
G 20 ( DB16)
Pb (Burner output)
Butterfly valve pressure drop
6000 8000 10000 12000 14000
KW
Pb (Burner output)
2
CHAPTER
Head pressure drop
G 31 ( DB20)
G 25 ( DB20)
G 25 ( DB16)
G 20 ( DB20)
KW
D8295
[kW]
G 25
( DB20)
G 25
( DB16)
G 20
G 20
( DB16)
( DB20)
G 31
( DB20)
G 31
( DB16)
16000 18000 20000 22000
D3891
[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
following 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.