Riello DB 3 LSM C13 Installation, Use And Maintenance Instructions page 38

2.5 Air side pressure drop (taken upstream from the completely open air damper)
60
50
40
30
20
10
The pressure curves refer to the different adjustment conditions for the combustion head. Refer to Paragraph 5.1
InIn the case of air supply at a higher temperature than 20°C and/or an altitude higher than 100 m. a.s.l., the pressure drop in the
head that is shown in the graph must be multiplied by the K
Altitude
m. a.s.l. 0 20
0 0.920 0.988
100 0.932 1.000
500 0.976 1.047
750 1.007 1.080
1000 1.038 1.114
1250 1.069 1.147
1500 1.102 1.182
1750 1.130 1.213
2000 1.174 1.260
2250 1.206 1.294
2500 1.251 1.343
2750 1.284 1.378
3000 1.320 1.417
Example
Burnt output = 4000 kW - Altitude = 750 m. a.s.l. - Combustive air temperature = 120 °C
From the diagram (curve 3), with an output of 4000 kW, a total pressure drop (head + air damper) is shown of: p
(combustive air at 20 °C and altitude 100 m. a.s.l.).
The table gives a multiplying coefficient, for combustive air at 120 °C and altitude 750 m. a.s.l., equal to K
The total pressure drop of the burner head is:
p = p
x K = 7 x 1.449 = 10.14 mbar.
20 c
250°C
0 3000 4000
Burner output Pb
40 60 80
1.055 1.122 1.190
1.069 1.137 1.205
1.119 1.190 1.262
1.154 1.228 1.302
1.190 1.266 1.342
1.226 1.304 1.382
1.263 1.344 1.425
1.295 1.378 1.461
1.346 1.432 1.518
1.382 1.471 1.559
1.434 1.526 1.618
1.472 1.566 1.660
1.514 1.610 1.707
CHAPTER
250°C
5000 6000 7000
[kW]
coefficient as indicated in the table below.
c
K
c
Air temperature °C
100 120 140
1.257 1.325 1.392 1.459
1.273 1.342 1.410 1.478
1.333 1.405 1.477 1.548
1.375 1.449 1.523 1.596
1.418 1.494 1.570 1.646
1.460 1.539 1.617 1.695
1.505 1.586 1.667 1.747
1.544 1.626 1.709 1.792
1.604 1.690 1.776 1.862
1.647 1.736 1.824 1.912
1.709 1.801 1.893 1.984
1.754 1.848 1.942 2.036
1.804 1.901 1.997 2.094
2
Burner description
D8115
8000
160 180 200 220
1.527 1.594 1.662
1.547 1.615 1.683
1.620 1.691 1.763
1.670 1.744 1.818
1.722 1.798 1.874
1.774 1.852 1.930
1.828 1.909 1.990
1.875 1.957 2.040
1.948 2.034 2.120
2.001 2.039 2.177
2.076 2.168 2.259
2.130 2.224 2.318
2.191 2.287 2.384
= 1.449.
c
Fig. 7
250
1.763
1.786
1.870
1.928
1.988
2.048
2.111
2.164
2.249
2.310
2.397
2.460
2.529
= 7 mbar
20
7