(See Fig. 16).
8.1
Plastic or steel tanks should be installed to BS5410.
A steel tank should also conform to BS799: part 5 and be arranged
with a slope of 1 in 24 away from the outlet valve with a sludge
cock at its lower end.
8.2
Do not use galvanised steel tanks or pipework for the oil
supply system.
8.3
Do not use soldered joints on the oil supply pipework as this
could cause a hazard in the case of a fire.
8.4
The burners on all appliances are supplied so as to be
connected to a single pipe gravity feed system. Details of how to
convert the burners to a double-pipe sub-gravity feed system
are shown in Fig. 15.
8.5 Oil Supply System
(a)
Single Pipe System
If a single pipe system is employed then the tank must be positioned
such that the oil level does not exceed 4 metres above the level of
the burner oil pump and in addition the oil level must be at least 0.3
metres above the level of the oil pump. Should it prove impossible to
site the tank below the 4 metres maximum oil level a head breaking
device must be installed between the tank and the burner.
(b)
Double Pipe System
If a double pipe system is used then the maximum suction
height allowable is 3.5 metres.
(c)
Single Pipe Suction Lift with De-aerator
If a single pipe suction lift with a de-aerator is used, the oil tank
must be positioned below the burner. An inlet and return loop
should be created between the de-aerator and oil pump. The oil
pump should be connected as for a double pipe system. Details
of how to convert to a double pipe system are shown in Fig. 15.
Oil inlet and return flexible hoses should be connected to the oil
pump inlet and return ports.
Table 6 is a general guide to determine the maximum allowable
pipe run when using a de-aerator.
Table 6 does not override the de-aerators manufacturers instruc-
tions and should only be used in conjunction with the manufac-
turers instructions.
If a non-return valve is not incorporated within the de-aerator
unit, a non-return valve should be fitted in the oil line between
the oil tank and the de-aerator.
NOTE:
If a de-aerator is used it should be fitted externally to the building.
8.6 Oil Supply Pipework
a)
The oil supply pipe diameter can be determined using Tables 4,
5 and 6 depending on whether a single or double pipe system or
single pipe system with de-aerator is being installed. Selection of
the correct pipe diameter will depend on the position of the oil stor-
age tank relative to the burner and the length of the pipe run.
b)
The oil supply pipe should be laid as level as possible to avoid
air pockets and unnecessary friction losses.
c)
The following components should be fitted in the fuel line
between the storage tank and burner:
1.
A manual isolating valve installed as close to the tank as
possible.
2.
A fire valve in accordance with BS5410 as shown in Fig. 16. The fire
valve should be fitted externally with a fire detection element located
within the appliance case. Use of a capillary type valve will allow a
neat and simple installation. A suitable valve is the KBB manufactured
by Teddington Controls Limited. Alternatively a fusible link or electri-
cal system may be used. Under no circumstances should a combina-
tion isolating/fire valve be used as the sole fire protection device.
3.
An oil filter should be fitted close to the oil storage tank. If
there is doubt about the internal oil line condition, a further filter
should be fitted near the boiler.
8. Oil Supply
10
Fig. 15. Oil Pump.
A. Danfoss BFP 11 Oil Pump.
B. Suntec AS47C Oil Pump.
1
2
3
4
5
6
A
To convert to a double pipe system: Remove the pump front
cover, remove the changeover screw (A) nearest to ports 1 and 2,
and the horseshoe washer underneath. Replace the changeover
screw back into the threaded hole. Connect the flow and return
pipes to 1 and 2.
Note:
When removing the pump front cover ensure that a suitable
receptacle is placed below the pump to catch the oil residue.
To convert to a double pipe system, remove the return port plug (2)
and insert the grub screw (A) provided into the threaded hole (B).
Connect flow and return pipes to (1) and (2).
1
2
3
3
4
5
B
A
1. Inlet
2. Return
3. Bleed and pressure
gauge port
4. Vacuum gauge port
5. Pressure adjustment
6. Nozzle outlet
TABLE 4 Single Pipe Gravity Feed System
MAXIMUM ALLOWABLE PIPE RUN
HEAD (metres)
(metres)
8 mm inside dia. pipe 10 mm inside dia. pipe
(10 mm O.D. copper)
(12 mm O.D. copper)
0.5
12
30
1.0
25
69
1.5
37
91
2.0
49
100
2.5
62
100
3.0
74
100
3.4
87
100
4.0
99
100
TABLE 5 Double Pipe Sub-Gravity Feed System
MAXIMUM ALLOWABLE PIPE RUN
HEAD (metres)
(metres)
8 mm inside dia. pipe 10 mm inside dia. pipe
(10 mm O.D. copper)
(12 mm O.D. copper)
0
50
100
0.5
44
100
1.0
38
95
1.5
32
80
2.0
26
66
2.5
20
50
3.0
14
37
3.5
8
22