18
Plugs for pressure measurement
To measure the pressure in the combustion chamber, as far as the IDEA series, a pressure plug is provided upstream the burner’s
blast tube.
Pressure in combustion head - gas rate curves
Natural gas Burners
Single-stage models
Double-stage models
The values in the diagrams refer to
natural gas
with a calorific value of 8125 kcal/Stm
3
(15°C, 1013 mbar) and a density of
0.714 kg/Stm
3
.
The values in the diagrams refer to
GPL
with a calorific value of 22300 kcal/Stm
3
(15°C, 1013 mbar) and a density of 2.14 kg/
Stm
3
. When the calorific value and the density change, the pressure values should be adjusted accordingly.
Gas
pr
essure
in
combu
sti
on
hea
d
NG70 M-..
Gas rate Stm
3
/h
NGX70 M-..
Gas rate Stm
3
/h
Ga
s
pre
ssu
re
in
combu
stio
n
head
NG90 M-.
Gas rate Stm
3
/h
P
P
Where:
Natural gas pressure shown in diagram
Real gas pressure
Natural gas flow rate shown in diagram
Real gas flow rate
Natural gas density shown in diagram
Real gas density
0
1
2
3
4
5
6
7
8
9
1,5
2 2,5 3 3,5 4 4,5
5 5,5
6 6,5 7 7,5
8
0
2
4
6
8
10
12
14
16
18
20
2
3
4
5
6
7
8
0
2
4
6
8
10
12
14
2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 9 9,5
