Adjusting Light Oil Flow Rate - Unigas PN91 Manual Of Installation - Use - Maintenance

Adjusting light oil flow rate

The light oil flow rate can be adjusted choosing a by-pass nozzle that suits the boiler/utilisation output and setting the delivery and
return pressure values according to the ones quoted on the chart below and the diagram on Fig. 15 (as far as reading the pressure
values, see next paragraphs).
NOZZLE
FLUIDICS WR2
FLOW RATE kg/h
DIMENSIONS Min
40 13
50 16
60 20
70 23
80 26
90 30
100 33
115 38
130 43
145 48
160 53
180 59
200 66
225 74
250 82
275 91
300 99
330 109
360 119
400 132
450 148
500 165
550 181
600 198
650 214
700 231
750 250
800 267
Tab. 4
Example: as for over 100kg/h nozzles, the 80% of the nozzle flow rate can be obtained with a return pressure at about 18bar (see Fig.
15Fig. 15).
C.I.B. UNIGAS - M039196CC
DELIVERY
PRESSURE
bar
25
Max
Pressure at nozzle 25bar
40
50
60
70
80
90
100
115
130 Pressure on return
145
160
180
200
225
250
275
Up to 100kg/h
300
330
360
400
450
Over 100kg/h
500
550
600
650
700
750
800
---------------Atomisation angle according to the return pressure
_________ % Flow rate
RETURN
PRESSURE MAX.
bar
19-20
Fig. 15
21
RETURN
PRESSURE MIN.
bar
7 - 9 (recommended)
Pressure at nozzle 357psi
Atomisation angle
Pressure on return
% Flow rate