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Liquid Process Systems offers a range of heat transfer fluid filtration systems for asphalt producers to utilise in preventative maintenance at their plants.

Filtering the hot oil in a plant to remove contaminants can minimise unscheduled maintenance that could disrupt operations and interrupt reliable supplies of asphalt for road surfacing, aggregates and roofing materials production during busy months.

Priorities for asphalt producers during seasonal downtime are preventative maintenance and upgrades to plants to assure an uninterrupted supply of product from hot and warm mix plants during the busy road-building season.

Liquid Process Systems said one way to implement preventative maintenance is to install a heat transfer fluid filtration system.

These systems make sure thermal oil is clean and filtered of contaminants, increase the useful life of hot oil and keep oil clean longer.

By keeping oil cleaner, fouling and sludge build-up are reduced, heat transfer efficiency is increased and wear on moving parts such as process pump mechanical seals, impellers and valves are reduced.

Liquid Process Systems include the model SC15CF Duplex Sentinel series heat transfer fluid filtration system and the Vector series model VB10C thermal fluid.

The company said both systems are easy to integrate within a new or existing facility, with the housings continuously filtering contaminants on a side-stream basis down to 10microns.

Continually filtering on a side-stream basis while the plant is operating keeps fluid clean for higher heat transfer and plant efficiency, longer fluid life and minimum maintenance downtime.

With both systems, a portion of the hot oil or thermal fluid from the main process pump discharge is diverted through the filter housing using existing hot oil heating system flow and pressure available from the plant.

Clean fluid is then returned to the suction side of the pump.

The model SC15CF Duplex Sentinel series is an automatic, standalone filtration system with a modular design that is said to make it versatile and allows location anywhere in the hot oil process heating loop.

The system has its own pump, filter element-loading monitor, valves, gauges and control panel, making it suitable for facilities where existing system flows and pressures are completely dedicated to heat users.

According to Judy Shums, president of Liquid Process Systems, this would leave insufficient fluid for only a manual Vector filter housing.

The Duplex Sentinel series can filter up to 30gpm (114lpm) of hot oil at 345C.

The system can withstand up to 150psig (10.5 barg) of pressure, up to 33 per cent more than the Vector series.

With its higher flow rates, system design pressures and temperature, this system can accommodate larger production facilities.

Housings in duplex arrangement help users achieve continuous filtration by switching from the clogged housing to the clean filter housing while the clogged housing elements are being changed.

Depending on process connections, the Sentinel can offer portability between process loops.

The Vector series model VB10C can withstand up to 100psig (6.9 barg) of pressure, with a flow rate and cleaning capacity up to 15gpm (57lpm) or more than 900gal/hr (3,405l/hr) at a temperature up to 345C.

This provides enough cleaning capacity to filter the entire volume of a smaller asphalt production facility several times in a typical day.

To install this system, two inlet and outlet connections are made by selecting from threaded, socket weld or flanged.

Life of the filter element is from six to 10 weeks, depending on the condition of the fluid.

An optional electronic filter element-loading monitor is available.

Liquid Process Systems

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