Oil Storage And Supply System; Fuel Supply - Grant Vortex Design, Installation And Servicing Instructions

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 fi ring. 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, fi re 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 fi rm 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 fi ttings 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
fl ared fi ttings. If compression fi ttings are to be used, a suitable
pipe insert must be fi tted 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 fi lter with a fi ltration size of no more than 50 μm
(micron) must be fi tted in the oil supply pipe close to the tank. This
should be fi tted with suffi cient clearance around and below it to
allow easy access for maintenance.
An isolating valve should also be fi tted at the tank, before the fi lter,
to allow the oil supply to be shut off for the fi lter to be serviced.
A second fi lter (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 fi re valve must be installed in the fuel supply
line in accordance with BS5410-1.
A fusible wheelhead type combined isolating/fi re valve MUST
NOT be used in place of a remote sensing fi re valve.
The fi re valve must be located outside; just before the oil line
enters the building, with the fi re valve sensor located above the
burner.
A spring clip for mounting the sensor is provided with the boiler.
This should be fi xed with the screw provided, using the small hole
in the front panel of the boiler.
The fi re valve should be located after the second (15 micron) fi lter,
i.e. between the fi lter and the point at which the oil line enters the
building. Refer to Figures 3-1 to 3-3.
Page 10
The fi re valve must have an operating temperature of between
65 and 72°C to avoid unnecessary nuisance shut-off s to the oil
supply.
A fl exible 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 3/8 male x ¼ female, 630 mm long (product
code: 20022601)
• 3/8x ¼" BSP adaptor (product code: 3005720)
These are available to purchase from Grant Ireland.
Metal braided flexible fuel hoses should be replaced ANNUALLY
when the boiler is serviced.
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 fi tted 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 suffi cient 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 fi tted in the supply pipe, along with
a fi re valve and fi lters (refer to section 3.1.2 - fuel pipes). A non-
return valve should also be fi tted 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
oil supply pipe sizing, refer to OFTEC Technical Book 3: Storage
and Supply, available for purchase from OFTEC.
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