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Liquid Process Systems has developed heat-transfer fluid filtration systems to help asphalt producers keep fluid clean for higher plant efficiency, longer fluid life and minimum maintenance downtime.

Filtering a plant’s hot oil 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.

A top priority for asphalt producers during seasonal downtime is Preventive Maintenance (PM) to ensure an uninterrupted supply of product from hot- and warm-mix plants during the busy road-building season.

One easy way to implement PM is to install a heat-transfer fluid filtration system.

These systems ensure 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 is significantly reduced.

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.

Filtration systems available from Liquid Process Systems include the Model SC15CF Duplex Sentinel Series Heat Transfer Fluid Filtration System and the patented Vector Series Model VB10C Thermal Fluid.

Both are easy to integrate within a new or existing facility, with the patented housings continuously filtering contaminants on a side-stream basis down to 10 microns.

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, stand-alone filtration system with a modular design that makes it extremely 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 Shums, 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 650F (345C).

The system can withstand up to 150pisg (10.5barg) 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 System can offer portability between process loops.

Liquid Process Systems also offers the Vector Series Model VB10C.

This filtration system can withstand up to 100psig (6.9barg) of pressure, with a flow rate and cleaning capacity up to 15gpm (57lpm) or more than 900 gal/hr (3,405 l/hr) at a temperature of up to 650F (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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