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Column 1
Combustion head pressure drop.
Gas pressure measured at the test point 1)(Fig. 23), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum output
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 23) with maximum
opening: 90°.
Example - RS 68 BLU:
2nd stage operation
Natural gas G 20 NCV 9.45 kWh/Sm
Gas ring nut 2)(Fig. 16 on page 18) adjusted as in the diagram
(Fig. 17 on page 18).
Gas pressure at test point 1)(Fig. 23)
Pressure in combustion chamber
11.6 - 3.0
A pressure of 8.6 mbar, column 1, corresponds in the table RS 68
BLU to an output in the 2nd stage of 700 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To calculate the required gas pressure at test point 1)(Fig. 23),
set the maximum modulating output required from the burner op-
eration:
–
find the nearest output value in Tab. G for the burner in ques-
tion.
–
read, on the right (column 1), the pressure at the test point 1)
(Fig. 23).
–
Add this value to the estimated pressure in combustion
chamber.
Example - RS 68 BLU:
Desired output in 2nd stage: 700 kW
Natural gas G 20 NCV 9.45 kWh/Sm
Gas ring nut 2)(Fig. 16 on page 18) adjusted as in the diagram
(Fig. 17 on page 18).
Gas pressure at an output of 700 kW
Pressure in combustion chamber
8.6 + 3.0
pressure required at test point 1)(Fig. 23).
Installation
3
=
11.6 mbar
=
3.0 mbar
=
8.6 mbar
3
=
8.6 mbar
=
3.0 mbar
=
11.6 mbar
21
GB
S8716
Fig. 23
20194185
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