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4.11.4 Gas pressure
indicates the pressure drop of the combustion head and the gas
butterfly valve depending on the operating output of the burner.
The values shown in refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
Column 1
Load loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 25), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum output;
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 25) with maximum
opening: 90°.
To know the approximate output at which the burner is operating
at its maximum:
–
Subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 25).
–
Find, in the relating to the burner concerned, column 1, the
pressure value closest to the result you want.
–
Read the corresponding output on the left.
Example with natural gas G 20 for RS 200/E FGR:
Maximum output operation
Gas pressure at test point 1)(Fig. 25)
Pressure in combustion chamber
13.1 - 3.0
A maximum output of 2000 kW shown in corresponds to 10.1
mbar pressure, column 1.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To know the required gas pressure at test point 1)(Fig. 25), set
the maximum output required from the burner operation, then:
–
find the nearest output value in the for the burner in question.
–
Read, on the right (column 1) the socket pressure 1)(Fig. 25).
–
Add this value to the estimated pressure in the combustion
chamber.
Example with natural gas G 20 for RS 200/E FGR:
Required burner maximum output operation: 2000 kW
Gas pressure at output of 2000 kW
Pressure in combustion chamber
10.1 + 3.0
pressure required at test point 1)(Fig. 25).
Installation
3
3
(8.2 Mcal/Sm
)
=
13.1 mbar
=
3.0 mbar
=
10.1 mbar
=
10.1 mbar
=
3.0 mbar
=
13.1 mbar
23
GB
1 p (mbar)
kW
1400
1500
1600
1700
1800
1900
2000
2100
2200
The heat output and gas pressure data in the
head refer to operation with gas butterfly valve
fully open (90°).
WARNING
S8716
2 p (mbar)
5,1
2,3
5,8
2,7
6,6
3,1
7,4
3,5
8,2
3,9
9,2
4,3
10,1
4,7
10,9
5,1
12,0
5,5
Tab. L
Fig. 25
20171664
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