10
(See Figs. 9, 10 and 11).
8.1
The oil storage tank must be installed in accordance with
BS799 Part 5. The tank should 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 con-
nected to a double-pipe sub-gravity feed system. Details of how
to convert the burners to a single-pipe gravity feed system are
shown in Fig. 10 and 11.
8.5
If a double pipe system is used then the maximum suction
height allowable is 3.5 metres.
8.6
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.
8.7
A single pipe suction lift with a de-aerator can be used when
the oil tank is positioned below the burner. An inlet and return
loop should be created between the de-aerator and oil pump.
De-aerators should be fitted externally to the appliance.
8.8
The oil supply pipe diameter can be determined using Tables
4 and 5 depending on whether a single or double pipe system is
being installed. Selection of the correct pipe diameter will
depend on the position of the oil storage tank relative to the
burner and the length of the pipe run.
8.9
The oil supply pipe should be laid as level as possible to
avoid air pockets and unnecessary friction losses.
8.10
Oil boiler connections between the boiler and storage tank
should be made in rigid pipework firmly attached to the wall or
other secure structural element.
8. Oil Supply
Fig. 9. Oil supply.
(a) Single pipe system
Oil tank
Oil tank
Sludge cock
Maximum oil level
H = 4 m (13 ft) maximum
H = 3.5 m (11.5 ft) maximum
Tank raised 1 in 24
(40 mm per metre)
Fire valve to
BS 799 Part 2
Fire valve to
BS 799 Part 2
Isolating
valve
Isolating
valve
Paper element
oil filter
Fire detection
element
Filter
Filter
Burner
Burner
Wall
(b) Double pipe system.
Sludge cock
Paper element
oil filter
Tank raised 1 in 24
(40 mm per metre)
Isolating
valve
Non return
valve
Non return
valve
Fire detection
element
Isolating
valve
1m (3ft) minimum from Fire Valve to appliance
Wall
1m (3ft) minimum from Fire Valve to appliance
H = 0.3 m (1 ft) minimum