13
GAS PRESSURE
The adjacent table shows minimum pressure
losses along the gas supply line depending on
the maximum burner output operation.
The values shown in the table refer to:
-
Natural gas G20 PCI 9.45 kWh/Sm
3
(8.2 Mcal/Sm
3
)
-
natural gas G 25 PCI 8,6 kWh/Nm
3
(7,4 Mcal/
Nm
3
)
Column 1
Pressure loss at combustion head.
Gas pressure measured at test point 1)(B), with:
• Combustion chamber at 0 mbar;
• Combustion head adjusted as indicated in
diagram (C)p. 18.
Column 2
Pressure loss at gas butterfly valve 2)(B) with
maximum opening: 90°.
Calculate the approximate maximum output of
the burner thus:
- subtract the combustion chamber pressure
from the gas pressure measured at test point
1)(B).
- Find the nearest pressure value to your result
in column 1 of the table (A).
- Read off the corresponding output on the left.
Example:
• Maximum output operation
• Natural gas G 20 PCI 10 kWh/Nm
3
• Gas pressure at test
point 1)(B)
=
16.4 mbar
• Pressure in combustion
chamber
=
3.0 mbar
16.0 - 3.4
=
13.4 mbar
A maximum output of 1600 kW shown in Table (A)
corresponds to 13.4 mbar pressure, column 1.
This value serves as a rough guide, the effective
delivery must be measured at the gas meter.
To calculate the required gas pressure at test
point 1)(B), set the maximim output required
from the burner operation:
- Find the nearest output value in the table (A).
- Read off the pressure at test point 1)(B) on
the right in column 1.
- Add this value to the estimated pressure in
the combustion chamber.
Example:
• Required burner maximum output operation:
1600 kW
• Natural gas G 20 PCI 10 kWh/Nm
3
• Gas pressure at burner
output of 1600 kW, taken
from table (A), column 1
=
13.4 mbar
• Pressure in combustion
chamber
=
3.0 mbar
13.4 + 3
=
16.4 mbar
pressure required at test point 1)(B).
kW
1
p (mbar)
2
p (mbar)
1100
7.0
1.1
1200
8.3
1.4
1300
9.6
1.7
1400
10.8
2.0
1500
12.1
2.2
1600
13.4
2.5
1700
14.6
2.8
1800
16.0
3.0
1900
17.0
3.2
2000
18.3
3.4
2150
21.2
3.9
(A)
S9002
(B)
Summary of Contents for RLS 190/M MZ
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