4.11.4 Gas Pressure - Riello RS 310/E ULX Installation, Use And Maintenance Instructions

4.11.4 Gas pressure

Each diagram indicate the minimum pressure drops depending
on the maximum burner output.
The values shown, refer to:
– Natural gas G 20 NCV 9.45 kWh/Sm
RS 310/E ULX
380
360
340
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800
RS 510/E ULX
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
1800
Calculate the approximate output of the burner in this way:
– subtract the combustion chamber pressure from the gas
pressure measured at test point P1)(Fig. 24).
– Enter the mbar scale (Fig. 23) and read the corresponding
output by reading on the dashed line.
20205048
3
(8.2 Mcal/Sm
2000 2200 2400 2600 2800
Installation
Each line is the sum of gas pressure drop through:
1 gas butterfly with maximum opening;
2 combustion head (with 0 mbar backpressure and combus-
tion head adjusted as indicated on page 23).
3
)
Burner output – kW
3000 3200 3400 3600 3800
Burner output – kW
Example RS 510/E ULX with G20 natural gas:
Fixed Output operation
Gas pressure at test point P1
Pressure in combustion chamber
A pressure of 90 mbar, corresponds to an output of 3000 kW with
factory setting for central gas.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
26 GB
S10334
G25
G20
S10335
G25
G20
4000 4200 4400 4600 4800
100 - 10 =
Fig. 23
= 100 mbar
= 10 mbar
90 mbar