Increasingly, modern engines use the Common Rail Method, which is subject to strict requirements in order to ensure proper functioning and wear protection of the high pressure fuel injection system.
The demands on fuel cleanliness are particularly high, with a required cleanliness code of up to ISO 12/9/6.
Operators additionally demand a long filter service life. It goes without saying that the filtration concept should also include optimal service friendliness and reduced costs for maintenance and replacement parts.
As a general rule, when Diesel fuel is used (e.g: MGO, MDO, biodiesel, MDA, MDB, MDC, kerosine, DIN EN ISO 3104 and DIN EN ISO 590 etc.), an efficient filtration is essential.
The cleanliness levels customarily found on ships with a value of 21/19/15 are very poor which leads to the following problems:
- failure of injectors
- strong wear.
An efficient filtration concept is needed in order to meet the requirements of the Common Rail System. For such applications, HYDAC has developed a solution containing several filtration units.
First, an engine protection filter (e.g. RFLD 331) located directly on the engine ensures the required, absolute cleanliness of the oil when it enters the Common Rail System.
Second, a filtration unit was developed as a fuel supply unit for maritime use and functions as a pre filter. This combines an automatic back flush filter RF4 with a filtration rating of 5 μm and a changeable return filter from the RFLD series with asymmetric design.
A new type of filter element design with glass fibre media was developed and is used in this main filter to ensure the required fuel cleanliness of ISO 12/9/6.
As a further development of the filtration unit, further module options have already been created, integrating pumps as well as tanks, if desired.