27 Jan Providing an Efficient Diesel Generator Fuel System
As larger amounts of fuel are being stored for even longer periods of time, the need for filtration is even greater. Fuel Oil over time will degrade in two areas. First microbes will grow in the oil which will affect the reliability of the generator itself. Second the quality of the fuel will degrade over time which could also affect the performance of the overall generator system. To maintain your fuel in top condition, a filtration system is used.
Filtration systems are used to remove water, microbial growth, and suspended solids. Knowing the fuel quality and flow requirement of your generator is very important in selecting the right filtration system. Filtration systems come in flow rates ranging from 5 Gallons Per Minute (GPM) up to 2,000 GPM utilizing state of the art micro-glass filter media with available absolute efficiencies of 25, 10, 6, 3 and 1 micron. The 10 micron fuel filter is the most common of the system.
Typically, diesel fuels delivered by tankers are between 50 and 80 micron and diesel generators work efficiently with fuel quality of between 2 and 5 microns. Most engine fuel filters are nominal 15 or 10 micron and the most damaging particle size by volume is 6 – 10 microns. Therefore, there is a need to bring the fuel quality to what will make the generators work most efficiently. This can best be achieved by the use of multi-level filtrations system. The multi-level filtration system works by gradually improving the fuel quality at each stage of fuel transfer to finally achieve the desired quality at the entry into the generator.
For a typical generating set, the delivery of diesel from the tanker into the bulk storage tank should have a centrifugal fuel purifier to improve the fuel quality from 50 microns to 25 microns, from bulk tank to the day tank a micro-glass filter is used to improve fuel quality from 25 microns to 10 microns. This is further improved from the day tank to the generator by using oil/water separator micro-glass filters to improve quality from 10 microns to about 2 microns.
This method of diesel fuel system filtration/purification is most cost effective compared with the use of filtration machines to improve the fuel system at a single stage. We have used this system on one of our projects – 14 Storey Civic Centre Towers, Lagos.