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4.11.6 Vacuum systems
Depressurised systems (Fig. 18) have a negative fuel pressure
(depression) at the burner intake.
Usually the tank is lower than the burner.
H
metres
Øi (8 mm)
0
0.5
1
1.5
2
3
3.5
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the pipe
The installer must ensure that the supply de-
pression never exceeds 0.4 bar (30 cm Hg).
Beyond this limit gas is released from the oil.
WARNING
The pipes must all be perfectly sealed.
20136866
A
L metres
Øi (10 mm)
35
100
30
100
25
100
20
90
15
70
8
30
6
20
Tab. G
Installation
20
GB
B
S9667
Fig. 18
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