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Parts & Service
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Generator sets have an internal fuel tank that feeds them directly. To make sure the generator set works properly, all you have to do is control the fuel level. In certain cases, perhaps due to increased fuel consumption or to increase the genset's running time or to keep the number of refuelling operations to a minimum, a larger external tank is added to maintain the level of fuel in the genset’s internal tank or to feed it directly.
The client must choose the location, materials, dimensions, components of the tank and ensure that it is installed, ventilated and inspected in compliance with the regulations governing oil installations for own use that are in force in the country where the installation is carried out. Particular attention should be paid to the regulations concerning the installation of fuel systems, as in certain countries fuel is classified as a 'hazardous product'.
To increase the running time and to satisfy special demands, an external fuel tank should be installed. Either for storage purposes, to make sure the internal tank always stays at the necessary level, or to supply the generator set directly from the tank. These options are the perfect solution to improve the unit’s running time.
To make sure the genset works properly and to make sure its internal tank always stays at the required level, it may be advisable to install an external fuel storage tank. To do this, the generator set should be fitted with a fuel transfer pump and the fuel supply line from the storage tank should be connected to the genset's connection point.
As an option, you can also install a non-return valve at the genset's fuel inlet to prevent the fuel from overflowing should there be a difference in level between the genset and the external tank.
Another possibility is to feed the generator set directly from an external storage and supply tank. For this you will have to install a supply line and a return line. The generator set can be equipped with a double-body 3-way valve that allows the engine to be supplied with fuel, either from an external tank or from the genset's own internal tank. To connect the external installation to the generator set, you need to use quick connectors.
If the clearance is greater than that specified in the pump documentation, if the installation is on a different level than that of the generator set, or if so required by the regulations governing the installation of fuel tanks, you may need to install an intermediate tank betweenthe genset and the main tank. The fuel transfer pumpand the placement of the intermediate supply tank must both be appropriate to the location chosen for the fuel storage tank. The latter must be in accordance with the specifications of the fuel pump inside the generator set.
Finally, and this applies to all three options shown, it may be useful to install the tank at a slight inclination (between 2° and 5º), placing the fuel supply line, the drainage and the level meter at the lowest point. The design of the fuel system shall be specific to the characteristics of the installed generator set and its components; taking into account the quality, temperature, pressure and necessary volume of the fuel to be supplied, as well as preventing any air, water, impurity or humidity from getting into the system.
See video on the installation of external fuel
Fuel storage is essential if the generator set is to function properly. It is therefore advisable to use clean tanks for fuel storage and transfer, periodically emptying the tank to drain decanted water and any sediment from the bottom, avoiding long storage periods and controlling the temperature of the fuel, as excessive temperature
increases can reduce the density and lubricity of the fuel, decreasing the maximum power output.
Don’t forget that the average life span of good quality diesel oil is 1.5 to 2 years, with proper storage.
Fuel lines, both supply and return, should prevent overheating, which could be harmful due to the formation of vapour bubbles that can affect the ignition of the engine. Pipelines should be black iron with no welding. Avoid galvanized steel, copper, cast iron and aluminium pipelines as they can cause problems for fuel storage and/or supply.
In addition, flexible connections to the combustion engine must be installed to isolate the fixed parts of the plant from any induced vibrations. Depending on the characteristics of the combustion engine, these flexible lines can be made in different ways.
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