Sistemas de filtragem

Practical Contamination Management From Processing to Delivery

Definition of Contamination Management

Contamination management pertains to the analysis and optimization of processes with regard to the cleanliness of components, systems and the purity of the fluids employed. In today’s hydraulic systems — in the automotive industry and their suppliers, the hydraulics and mobile hydraulics industry — smaller, lighter and more powerful components are currently being employed as compared to say 10 years ago. The use of these components also means that the demands made of system cleanliness are now much higher, as has been shown by various studies.

Between 70-80 % of hydraulic system outages is due to increased system outages is due to increased contamination. This failure rate not only applies to the classic hydraulics industry. Contamination Management is also a key issue in the automotive industry, in which the use of electrohydraulic systems is on the rise. In this context, hydraulic or fluid power systems are used in a general sense for all industries (automotive, hydraulics and mobile hydraulics industries). Cleanliness specifications are currently applied in the automotive industry for thefollowing:

motors (fuel and oil supply systems) power steering manual/automatic transmissions electrohydraulic systems (suspension, clutch, brake, ABS and ESP systems) central hydraulic systems

This list is by no means exhaustive and is intended rather as a sample of the areas in which contamination management plays a role.

In the past, power fluid systems were equipped with system filtration which cleaned the system during commissioning and then had the task of maintaining system fluid cleanliness at a constant level, e.g. by using commissioning filters and initial brief maintenance intervals followed by changing over to system filtration. This approach frequently no longer suffices due to the growing demands made of today’s hydraulic systems (extended maintenance intervals and mounting cost pressure). Precommissioning flushing is performed in large systems in the hydraulics industry to quickly bring the contamination level down to an acceptable level.

However, in small, mass-produced hydraulic systems (e.g. in the automotive and hydraulics industries) this is not always possible. That is why contamination management begins with the manufacture of the individual components and extends throughout the entire process chain up to and including the finished component. Ideally, the design and development departments are also integrated in this process so that component design facilitates the washing of components in a costefficient manner. Suppliers also have to be involved in contamination management when the manufacturing process involves a large portion of sourced components. By introducing contamination management with a view to minimizing particulate concentration in all areas, beginning with manufacturing and extending to the operation of the entire system, system malfunction and failure caused by particulate contamination can be prevented and, as a result, costs savings achieved. Cutting the costs of machining tools, improving the utilization of test stations, and optimizing the use of washing machines can do this.