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3
OIL STORAGE AND SUPPLY SYSTEM
3.1
FUEL SUPPLY
3.1.1
FUEL STORAGE
The tank should be positioned in accordance with the
recommendations given in BS 5410-1 (Code of practice for
liquid fuel firing. Installations for space heating and hot water
supply purposes for domestic buildings). This gives details of the
requirements for suitable oil tank construction, tank installation,
tank bases, fire protection and secondary containment.
For installations of greater than 70kW output capacity, the tank
should be installed accordance with BS 5410-2.
Oil storage tanks should comply with the following standards:
•
Plastic tanks OFT T100
•
Steel tanks
OFT T200
! CAUTION !
A galvanised tank must not be used.
! NOTE !
Plastic tanks should be stood on a firm non-combustible
base that adequately and uniformly supports the weight of
the tank over its entire base area.
The tank capacity should be selected to suit the appliance rated
output. Refer to BS5410-1 for guidance.
3.1.2
FUEL PIPES
Fuel supply pipes should be either copper or steel. Galvanised
pipes or fittings should not be used.
Plastic oil supply pipe conforming to BS EN 14125 can be used
for underground pipe runs, but must not be used above ground.
All soft copper pipe connections should preferably be made using
flared fittings. If compression fittings are to be used, a suitable
pipe insert must be fitted into the pipe end.
Soft soldered connections must NOT be used on oil supply
pipework.
Fuel supply pipework should be of a suitable diameter, depending
on the type of oil supply system being used. Refer to information
given in sections 3.1.3, 3.1.4 or 3.1.5.
Run pipes as level as possible to prevent air being trapped. Take
the most direct route possible from tank to burner whilst locating
the pipe where it will be protected from damage.
Pipes should be supported to prevent sagging and sleeved where
they pass through a wall.
A metal body fuel filter with a filtration size of no more than 50 μm
(micron) must be fitted in the oil supply pipe close to the tank. This
should be fitted with sufficient clearance around and below it to
allow easy access for maintenance.
An isolating valve should also be fitted at the tank, before the filter,
to allow the oil supply to be shut off for the filter to be serviced.
A second filter (15 μm for Kerosene) must be located closer to the
burner to protect the burner pump and nozzle from contamination.
Refer to Figures 3-1 to 3-3.
A remote sensing fire valve must be installed in the fuel supply
line in accordance with BS5410-1.
A fusible wheelhead type combined isolating/fire valve MUST
NOT be used in place of a remote sensing fire valve.
The fire valve must be located outside; just before the oil line
enters the building, with the fire valve sensor located above the
burner.
A spring clip for mounting the sensor is provided with the boiler.
This should be fixed with the screw provided, using the small hole
in the front panel of the boiler.
The fire valve should be located after the second (15 micron) filter,
i.e. between the filter and the point at which the oil line enters the
building. Refer to Figures 3-1 to 3-3.
Page 10
The fire valve must have an operating temperature of between
65 and 72°C to avoid unnecessary nuisance shut-offs to the oil
supply.
A flexible fuel hose and ¼ʺ isolating valve are supplied lose with
the boiler, to make the final connection to the burner.
If a two-pipe system or deaerator is to be used, the following
additional items will be required:
•
Flexible fuel hose ⅜ʺ male x ¼ʺ female (product code:
RBS36 - 900 mm / product code: RBS36XS - 600mm)
•
⅜ʺ x ¼ʺ BSP adaptor (product code: Z3003602)
•
¼ʺ isolating valve (product code: ISOLATION1/4)
These are available to purchase from Grant UK.
Metal braided flexible fuel hoses should be replaced ANNUALLY
when the boiler is serviced.
Long life flexible fuel hoses should be inspected annually and
replaced, if necessary, or after a maximum five years service life.
3.1.3
SINGLE PIPE (GRAVITY) SYSTEM -
(REFER TO FIGURE 3-1)
Head A (m)
10 mm OD pipe
0.5
1.0
1.5
2.0
If the storage tank outlet is at least 300 mm above the level of the
burner oil pump, a single pipe (gravity) system should be used.
The maximum height of the oil level above the burner oil pump
when the tank is full, must not exceed four metres. If this height
is exceeded, a pressure reducing valve must be fitted in the oil
supply pipe between the tank and the burner oil pump.
The maximum length of pipe run from the tank to the burner is
limited by the minimum head of oil (the height of the tank tank
outlet above the burner oil pump).
3.1.4
TWO PIPE SYSTEM -
(REFER TO FIGURE 3-2)
Head A (m)
10 mm OD pipe
0
0.5
1.0
1.5
2.0
3.0
3.5
If the storage tank outlet is below the level of the burner oil pump,
a two pipe (sub gravity) system can be used.
The return pipe should be at the same level as the tank outlet,
between 75 to 100 mm above the base of the tank. The return
pipe should be a sufficient distance from the tank outlet so as to
prevent any sediment disturbed by the return entering the supply
pipe from the tank.
A non-return valve should be fitted in the supply pipe, along with
a fire valve and filters (refer to section 3.1.2 - fuel pipes). A non-
return valve should also be fitted in the return pipe if the top of the
tank is above the burner oil pump.
The maximum suction height (from the tank outlet to the level of
the burner oil pump), must not exceed 3.5 metres.
The pump vacuum should not exceed 0.4 bar. Beyond this limit,
gas is released from the oil.
For guidance on the installation of top outlet fuel tanks and suction
Section 3: Oil Storage and Supply System
Maximum pipe run (m)
12 mm OD pipe
10
20
20
40
40
80
60
100
Maximum pipe run (m)
12 mm OD pipe
35
100
30
100
25
100
20
90
15
70
8
30
6
20
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