Riello DB3 SM C03 Installation, Use And Maintenance Instructions page 40

2.6 Gas side pressure drop
D7541
50
40
30
20
10
0 2000
Fig. 12
10
D7542
8
6
4
2
0 2000
Fig. 13
10
Head pressure drop
4000 6000
Pb (Burner output)
Butterfly valve pressure drop
4000 6000
Pb (Burner output)
2
CHAPTER
8000
[kW]
8000
[kW]
Burner description
Gas pressure on the basis of
the maximum output developed
by the burner is given by the
curves in Fig. 12.
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 butterfly valve;
• combustion chamber at 0
mbar;
• burner working at full out-
put.
The pressure drop of the com-
pletely open butterfly valve is
given in Fig. 13.