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Cross Manufacturing has developed a filter for the extremely corrosive environment of sea water and estuary water systems.

Cross claims to have developed long-lasting, reliable automatic filtration equipment that can be installed in modules to meet even the largest flow.

According to Cross, large-scale installations such as desalination plants, coastal power stations and cooling tower circuits could all see significant savings in relatively short time scales.

Smaller applications such as sea life centres and marine developments could also use the same product on a smaller scale.

The technology is based on a stainless-steel ‘zero-gravity’ filter coil that is already in use in many areas of industry, including water and wastewater treatment and heating and air conditioning plant rooms.

A set of filter coils is fitted into a pod and each pod can be backwashed individually and automatically at a selectable differential pressure value.

The filtration process is not interrupted, which ensures minimal effect on flow and the requirement for any redundant filtration capacity is eliminated.

Automation is PLC controlled and actuation, in larger systems, is pneumatic.

The key has been to identify materials that not just withstand the corrosive nature of sea water, but also the destructive action of erosion caused by silt-heavy estuary water.

Research carried out by Cross concluded that a filter coil made from alloy 625 combined with a large polypropylene housing, polyethylene pipe work and bronze backwashing valves is appropriate for large-scale sea water and estuary filtration systems.

An all-metal construction is also being designed for high-pressure systems or areas where there may be higher temperatures.

Cross Manufacturing

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