IPU’s fuel team were called by a facilities management company at Canary Wharf to sample the diesel in their two 70,000 litre bulk tanks. Analysis showed that the fuel was heavily contaminated with water, colloid carbon, ashphaltine deposits and gums, resins and varnish crystals. Such was the level of particulate, it was not possible to assign an ISO cleanliness code because the samples were out of range. This proved that the original polishing system was ineffective in protecting the fuel and so the decision was made by the facilities management company to decommission and replace it.
The legacy fuel polishing system used a centrifugal separation technology more commonly found in marine applications. While the unit featured an element of self-cleaning it meant that a dedicated tank was required to discharge solid matter and contaminated fluids. The maintenance of this system had become troublesome as it required frequent manual draining and a certified professional was constantly required on site to remove the hazardous waste.
IPU Group and Optimum Power Services (OPS) proposed replacing the legacy fuel polishing system with Diesel Defence DD90. The DD90 will reliably maintain the fuel, be autonomous in operation and could be effective on diesel that included up to 20% biodiesel.
Diesel Defence offers improved energy efficiency over the legacy system and removes the need to frequently drain hazardous waste from a collection tank, resulting in a considerable annual saving. The Diesel Defence polishing unit also has the capacity to circulate the entire contents of each bulk tank at least 7 times per month, the optimum amount for a complete and thorough circulation. Alongside the DD90, IPU and OPS also installed vent TRAP filters to prevent dirt and moisture from entering the tank through open air vents.