9
3.1 Fuel Supply
Fuel Storage
The tank should be positioned in
accordance with the recommendations
given in BS 5410-1:2014, which gives
details of filling, maintenance and
protection from fire.
A steel tank may be used and must be
constructed to BS 799-5:2010 and OFS
T200.
A galavanised tank must not be
used.
A plastic tank may be used and must
comply with OFS T100.
Plastic tanks should be adequately
and uniformly supported on a
smooth level surface, across their
entire base area, that is, the area in
contact with the ground.
Fuel Pipes
Fuel supply pipes should be of copper
tubing with an external diameter of at
least 10 mm.
Galvanised pipe must not be used.
All pipe connections should preferably
use flared fittings. Soldered connections
must not be used on oil pipes.
Flexible hoses must NOT be used
outside the boiler case of Utility
models.
3 Oil Storage and Supply System
A remote sensing fire valve must be
installed in the fuel supply line (outside)
where it enters the building, with the
sensing head located above the burner.
Recommendations are given in BS
5410-1:2014.
It is recommended that a good quality
metal bowl type fuel filter is fitted at the
tank and a secondary filter in the fuel
supply line adjacent to the boiler (15
µ for Kerosene) to protect the burner
pump and nozzle from contamination.
If the boiler operates on bio kerosene, a
compatible filter should be used.
A flexible fuel line, adaptor and ¼” BSP
isolation valve are supplied loose with
the boiler for the final connection to
the burner. If a two pipe system or
‘Tiger Loop’ type de-aerator is used, an
additional flexible fuel hose (900 mm)
and 3/8” to 1/4” BSP male adaptor are
available to purchase from Grant UK
(product codes: RBS35 and RBS36).
Metal braided flexible hoses should be
replaced annually when the boiler is
serviced. Long life flexible hoses should
be inspected annually and replaced at
least every 60 months.
Single pipe system (see Figure 3-1)
With the storage tank outlet above the
burner a single pipe system should be
used. The height of the tank above the
burner limits the length of pipe run from
the tank to the burner.
As supplied the burner is suitable for a
single pipe system
Two pipe system (see Figure 3-2)
With the storage tank outlet below the
burner, a two pipe system should be
used. The pipe runs should be as
shown in Figure 3-2. The return pipe
should be the same level in the tank
as the supply pipe, both being 75 to
100 mm above the base of the tank.
The pipe ends should be a sufficient
distance apart so as to prevent any
sediment disturbed by the return
entering the supply pipe.
Avoid the bottom of the tank being
more than 3.5 m below the burner.
A non-return valve should be fitted in
the supply pipe together with the filter
and fire valve. A non-return valve should
be fitted in the return pipe if the top of
the tank is above the burner.
To be used with a two-pipe system, the
burner must be fitted with an additional
flexible fuel pipe - a flexible fuel hose
(900 mm) and 3/8” to 1/4” BSP male
adaptor are available to purchase from
Grant UK (product codes: RBS35 and
RBS36).
The pump vacuum should not exceed
0.4 bar. Beyond this limit gas is
released from the oil.
For guidance on installation of top outlet
fuel tanks and suction oil supply sizing,
see OFTEC Technical Book 3. Available
from OFTEC.
!
CAUTION
!
NOTE
!
CAUTION
Figure 3-1: Single pipe system
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