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4.11 Hydraulic system
4.11.1 Fuel supply
Double-pipe circuit (Fig. 19)
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in the table at the side.
The tank higher than the burner A
Distance "P" must not exceed 33 ft in order to avoid subjecting the
pump's seal to excessive strain; distance "V" must not exceed 13 ft
in order to permit pump self-priming even when the tank is almost
completely empty.
The tank lower than the burner B
Pump suction values higher than 13 ft must not be exceeded be-
cause at higher levels gas is released from the fuel, the pump starts
making noise and its working life-span decreases.
It is good practice to ensure that the return and suction lines enter
the burner from the same height; in this way it will be less probable
that the suction line fails to prime or stops priming.
The loop circuit
A loop circuit consists of a loop of piping exiting and returning to the
tank with an auxiliary pump that circulates the fuel under pressure.
A branch connection from the loop goes to feed the burner.
This circuit is extremely useful whenever the burner pump does not
succeed in self-priming because the tank distance and/or height
difference are higher than the values listed in the table below.
+ H
L (ft)
- H
Ø (inch)
(ft)
1/2"
5/8"
+ 13
197
263
+ 10
164
230
+ 6.6
132
197
+ 4.8
115
181
+ 3.3
99
164
+ 1.6
82
148
0
66
132
- 1.6
59
115
- 3.3
49
99
- 4.8
43
82
- 6.6
33
66
- 10
16
33
- 13
-
20
20031446
Installation
7
6
6
H
Pump/foot valve height difference
L
Piping length
Ø
Inside pipe diameter
1
Burner
2
Pump
3
Filter
4
Manual on/off valve
5
Suction line
6
Foot valve
7
Return line
V
Max distance 13 ft
22
GB
5
A
1
4
5
3
7
B
2
D737
Fig. 19
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