" In a climate of continued environmental focus there has been a drive towards reduced tailpipe emissions in all major global markets. In order for manufacturers to develop engines that can comply with the new legislations, engine technologies have been developed both in complexity and cost.
Additionally, there has been a demand to reduce fuel consumption and greenhouse gas production.To deal with these demands, diesel engine injection pressures have increased to the 2500 bar (36,300 psi) range, driven by the criteria emissions benefits associated with higher injection pressures. Complex after-treatment systems coupled with a drive for improved NVH has led to an increase in injection flexibility with multiple pilot injections and late post injections for DPF and SCR management. Common rail has emerged as the mainstream technology across all sectors.
The increase in system pressures in diesel engines has a significant effect on filtration requirements. These systems are highly vulnerable to many forms of contaminants and the need for robust high efficiency filtration has never been higher.
The costs of fuel injection systems have also risen in line with system pressure increases and this further justifies the increase in filtration efficiency to protect these systems. An analysis of global diesel fuel quality shows that although the fuel quality in the developed markets has improved, significant quality concerns still remain... "