Riello P 140P/NA Installation, Use And Maintenance Instructions page 40

5.2 BURNER ADJUSTMENTS
The installer should carry out these adjustments when commissioning the burner.
5.2.1 ADJUSTMENT OF FUEL MAXIMUM OUTPUT
For each nozzle rated flow, the real oil flow varies according to:
1) oil pressure at the nozzle inlet (capacity increases when the pressure does, shifting from low to
high flame);
2) oil density;
3) air steam pressure at the nozzle inlet (oil capacity increases when the air/steam pressure de-
creases);
when the air/steam pressure decreases 1 bar, this causes an approx. 10% increase in the oil
flow and vice versa.
To avoid variations in oil flow during operation, there should be a stable air/steam spraying
pressure. Even a minor pressure variation can cause important variations in the sprayed oil de-
livery.
4) oil viscosity (oil output increases when viscosity is lower)
when viscosity decreases 10 cSt, this causes an approx.10% increase in the oil flow and vice
versa.
NOTE: sprayed oil viscosity diminishes when temperature increases.
IMPORTANT: check every fuel nozzle for correct combustion calibration.
NOZZLE SELECTION
Viscosity
at nozzle
Nozzle
15 AG 45°
cSt
5
10
60
20
30
5
10
70
20
30
5
10
80
20
30
5
10
100
20
30
5
10
130
20
30
5
10
160
20
30
5
10
200
20
30
5
10
225
20
30
2544500
Oil density
3
kg/hm 6 bar 5 bar
850 112 94
875 95 80
900 75 60
925 68 55
850 130 110
875 111 95
900 88 70
925 80 64
850 150 130
875 127 108
900 100 80
925 91 73
850 187 158
875 158 135
900 126 105
925 114 91
850 243 200
875 206 173
900 163 131
925 148 118
850 299 260
875 253 215
900 201 161
925 182 145
850 374 330
875 317 270
900 252 203
925 228 182
850 421 365
875 357 311
900 280 225
925 256 205
Oil flow
Kg/h consumption in kg/h
4 bar 3 bar 2 bar
75 60 32
60 41 20
42 25 N/A*
36 20 N/A*
90 70 36
78 48 25
50 30 N/A*
44 24 N/A*
105 80 40
85 55 30
55 35 N/A*
51 30 N/A*
130 100 50
100 70 35
70 40 N/A*
65 35 N/A*
170 130 60
130 95 40
90 55 N/A*
82 45 N/A*
210 160 80
170 115 50
115 65 N/A*
102 58 N/A*
260 215 105
215 145 60
140 85 N/A*
120 70 N/A*
285 220 110
240 160 70
156 100 N/A*
141 60 N/A*
8 GB
Recommended
Air/steam
air/steam
pressure
High Low
bar
flame flame
2.5 8.4
5.9 13.9
10 20
11.3 21.7
2.9 9.9
6.8 16
11.9 23
13.2 25.4
3.3 11.3
7.8 18.3
13.6 26.2
15 28.9
4.2 14
9.8 22.8
17 32.7
18.8 34.2
5.4 18.3
12.7 29.7
22 42.6
24.4 47
6.7 22.5
15.7 36.5
27.1 52.4
30 57.9
8.3 28.1
19.6 45.7
33.9 65.5
37.5 72.4
9.4 31.7
22.1 51.4
38.2 73.7
42.2 81.4
Fig. 9
2
3
4
4
2
3
4
4
2
3
4
4
2
3
4
4
2
3
4
4
2
3
4
4
2
3
4
4
2
3
4
4