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PART I: SPECIFICATIONS
Checking the proper gas train size
To check the proper gas train size, it is necessary to the available
gas pressure value upstream the burner's gas valve. Then subtract
the backpressure. The result is called pgas. Draw a vertical line
matching the furnace input value (600kW, in the example), quoted
on the x-axis, as far as intercepitng the network pressure curve,
according to the installed gas train (DN65, in the example). From the
interception point, draw an horizontal line as far as matching, on the
y-axis, the value of pressure necessary to get the requested furnace
input. This value must be lower or equal to the pgas value, calcula-
ted before.
Pressure in the Network / gas flow rate curves
Natural Gas burners
C83X
3
Stm
/h
ATTENTION: the gas rate value is quoted on the x-axis, the related network pressure is quoted on the y-axis
(pressure value in the combustion chamber is not included). To know the minimum pressure at the gas train inlet,
necessary to get the requested gas rate, add the pressure value in the combustion chamber to the value read on
the y-axis.
The values in the diagrams refer to natural gas with a calorific value of 8125 kcal/Stm
3
0.714 kg/Stm
.
The values in the diagrams refer to GPL with a calorific value of 22300 kcal/Stm
3
Stm
. When the calorific value and the density change, the pressure values should be adjusted accordingly.
25
20
15
10
5
0
100
Natural gas pressure shown in diagram
Where:
Real gas pressure
Natural gas flow rate shown in diagram
Real gas flow rate
Natural gas density shown in diagram
Real gas density
10
Rp 2" (50)
200
300
400
500
600
Power kW
Potenza / Output (kW)
3
(15°C, 1013 mbar) and a density of
3
(15°C, 1013 mbar) and a density of 2.14 kg/
DN65
DN65
700
800
900
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