Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 8 of 165 TD/TAD4 Manual Rev 4
1.3.1 Fuel Tanks
Fuel storage tanks must be positioned to maintain a positive head to burners or ring main pumps,
regardless of the oil level in the tank.
Vertical and horizontal storage tanks should be mounted on concrete plinths in accordance with
local, national or any environmental standards that may apply.
The fuel lines and fuel filtration system must be sized to prevent any possibility of vacuum
occurring in the pump suction ports.
If a positive head of oil is not maintained, there is a possibility that cavitations will occur within the
fuel pump.
As a general guide, the fuel storage tanks must be mounted at least one meter above the ring main
fuel pumps which should be sited as close as possible to the tank discharge.
1.3.2 Filtration
Duplex fuel filtration is recommended to the ring main pumps, this will allow for maintenance
without shutdown of the ring main system, during normal operation of the plant.
1.3.3 Ring Main Pumps
The ring main pumps should be sized to give 100 to 150% over the burner pumps fuel
requirements.
Pumps must be fitted with an internal relief valve set at a maximum of 3 bar for pump protection.
Manual isolation valves should be fitted to the pump inlet and outlet pipework to allow for
maintenance. It is recommended that the valves have electric switch packs fitted to them so that
they can be interlocked with oil operation.
It is always preferable to use duplex pumping where practical, particularly on multi-burner
installations.
1.3.4 Pipe Runs
Pipework should be run in a manner that allows it to be self venting and, in sections that require
venting, a suitable vent or de-gassing section should be fitted.
Where overhead ring mains are to be installed particular care and attention should be taken that the
system can be adequately vented. Welded construction is preferable to screwed connections.
1.3.5 Burner Connection
Burner connections should be provided in the ring main pipework adjacent to the boiler and close
enough to allow the burner to be opened without the need to disconnect the flexible oil lines.
Note: - Manual isolation valves should not be fitted on the return lines.
1.3.6 Burner Filtration
Burner filtration will depend on the size of burners in question and the quality/grade of the fuel oil
to be used, but good quality fuel filters, preferably of the self-clean type are recommended.
1.3.7 Pressure Regulation
The Pressure regulating valve of the ring main must be of the low, or zero, hysteresis type and
capable of maintaining a stable ring main pressure through the minimum and maximum flow
conditions of the supply system irrespective of any change in flow volume or viscosity.
A number of suppliers manufacture valves suitable for this purpose and further details are available
from the Dunphy technical department.
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