BENSON AH150 - Fuel; Fuel Storage Tank; Single Pipe System - Gravity Feed

2.2 Fuel
In order to promote trouble free operating it is necessary that the oil within the storage tank
and oil line does not fall below the cold filter plugging point (cfpp), in this country and with class 0
fuel (also referred to as gas om, the critical temperature is -4 °C for the summer grade. The cfpp
critical temperature for the winter grade is -12° e. If summer grade fuel is stored for winter use in
areas prone to severe frosts and low temperatures it will be necessary to insulate or even heat the
supply tank and pipework.
Note
The fuel supplier should be contacted prior to installation so that any requirements concerning
delivery, transport, storage and use can be addressed before work commences .
Warning
The pump pressure must not exceed a maximum of 0.4 bar, this is because beyond this point
gas is liberated from the oil.
2.3 Storage tank
Any externally painted steel storage tank to BS 799 part 5 1987 is required, and must include
the following;
- a fuel level
gauge (not made from glass)
- a
vent pipe with a diameter greater than that of the filler and featuring a weather proof
termina tion
- a
sludge valve
-
an outlet valve situated at the opposite end of the tank to the sludge valve
- a filler
pipe connection situated at the opposite end to the outlet valve
The size of
the storage tank must take account of the estimated consumption and any quantity
price breaks offered by the oil supplier. It is preferable to install the tank outside, however, if this
is
not practicable and the tank has to be installed indoors advice must be sought about its siting,
especially so far as fire
regulations are concerned. If a separate fire resistant chamber cannot be
provided for indoor installations, a catchment pit with a capacity ten percent greater than that of
the storage tank must be provided . Storage tanks can if necessary be sited on a roof, but this is
subject to special regulations as well as local authority approval and compliance with fire
regulations, reference to BS 5410 part 2 1978 is strongly suggested.
It is advisable to leave the tank unpainted on the inside, but to paint the outside with a
proprietary grade of anti-corrosive paint. A galvanised or open topped tank is strictly not
allowed.
If a medium density polyethylene oil tank is to be used then it must be OFTEC certified to OFS
T-100. Local, national,
European and fire regulations must also be complied with.
2.4 Single pipe system (gravity feed)
For installation where the oil tank is 200mm or more above the level of the fuel pump the
principle of gravity feed may be used. The draw off point for the supply to the burner must not be
positioned any lower than 100mm above the bottom of the tank. Where a return valve is fitted
this
must be tamper proof to prevent inadvertent operation.
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