Common rail systems require the highest fuel cleanliness
In common rail systems, the injection timing and fuel quantity are calculated cylinder-by-cylinder and injected via fast-switching solenoid valves (injectors) to achieve improved engine performance as well as lower fuel consumption and emissions. The size of the nozzles of the injectors in common rail diesel systems is 2 – 4 microns (μm) and enables precise injection. They operate at a pressure of up to 3,000 bar. Typically, a 5-micron filter is integrated. The diesel for these systems must be up to 30 times cleaner than for standard injection systems. Due to the high pressures and tight tolerances, impurities have serious consequences.
The conventional method: disposing of fuel
To ensure the reliable start and operation of the emergency power system, operators regularly check the fuel quality. When the critical state is reached, they replace the stocks and dispose of them. The high fuel consumption is accepted, as the uninterruptible power supply must be guaranteed, and failures are more cost-intensive than the fuel. With us, however, this is more ecological and economical.