12
10090943EN
5. Fuel
System
5.1. Oil
Pipes
The oil tank and the oil pipes must be installed to avoid the risk of the oil cooling below cloud
point. The cloud point of heating oil depends on the oil quality. If the oil is allowed to cool to the
cloud point, valves and filters will block. The most suitable oil temperature is +15...+25°C.
Note!
The viscosity of oil coming to the burner must be 4 - 6 mm²/s (cSt).
The maximum lengths for other viscosities can be calculated by the simple ratio of viscosities
i.e. if the table shows lengths for 5 or 6 mm²/s (cSt) viscosity, multiply the length shown in the
table by 5 or 6 and divide by the value of the new viscosity mm²/s (cSt).
Keep in mind that absolute tightness is the fundamental pre-requisite for secure operation. A
leaking suction line may cause, among other things, afterspraying of oil into the boiler. It is
advisable to use ball valves instead of needle valves.
The tables give the maximum lengths (in meters) of return and suction lines.
Overlying oil tank
Underlying oil tank
H m
DANFOSS BFP/MS (ø d mm)
H m
DANFOSS BFP/MS (ø d mm)
ø 6 mm
ø 8 mm
ø 10 mm
ø 6 mm
ø 8 mm
ø 10 mm
0 17
53
100
0 17
53
100
0,5 19
60
100
0,5 15
47
100
1,0 21
66
100
1,0 13
41
99
1,5 23
72
100
1,5 11
34
84
2,0 25
79
100
2,0 9
28
68
2,5 27
85
100
2,5 7
22
53
3,0 29
91
100
3,0 5
15
37
3,5 31
98
100
3,5 - 9
22
4,0 33
100
100
4,0 6
2800 rpm, 6 mm²/s (cSt)
2800 rpm, 6 mm²/s (cSt)
H m
SUNTEC 45/47 (ø d mm)
H m
SUNTEC 45/47 (ø d mm)
ø
6
mm
ø 8
mm
ø 10
mm
ø 12
mm
ø
6
mm
ø 8
mm
ø 10
mm
ø 12
mm
0 14
49
123
150
0 14
49
123
150
0,5 16
55
136
150
0,5 12
43
109
150
1,0 18
61
150
150
1,0 10
37
94
150
2,0 22
73
150
150
2,0 7
26
65
138
3,0
25 85 150 150
3,0
- 14 37 78
4,0 29
96
150
150
4,0 -
-
8
18
2850 rpm, 5 mm²/s (cSt)
2850 rpm, 5 mm²/s (cSt)
Dmax = 20 m
Hmax = 4,5 m
(D-H)max. = 4,5 m
See the oil piping dimensions from the Oilon Plus manual, if an Oilon Plus filter and deaerator
unit is used.
