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Alfa Lavalís new tantalum range minimizes lifecycle costs for heat exchangers in highly corrosive applications

Posted: Tuesday 29th July 2014

Alfa Laval is launching a new range of tantalum heat exchangers that offer the exceptionally high corrosion resistance of a solid-tantalum heat exchanger, but at a much lower investment cost. The combined benefits of lower capital cost, long lifetime and minimal maintenance requirements results in significantly lower total cost of ownership compared to heat exchangers made of high-grade alloys, graphite, silicon carbide or glass.

Unique surface treatment

Tantalum is one of the most corrosion-resistant metals, but itís also very costly, making solid-tantalum heat exchangers extremely expensive.

The heat exchangers in Alfa Lavalís new tantalum range are stainless steel heat exchangers that have undergone a unique treatment where a thin layer of tantalum is metallurgically bonded to all surfaces exposed to corrosive media. The result is maximum corrosion resistance and mechanical stability at a low investment cost, making the technology affordable to a wide range of applications.

Designed for the toughest conditions

The new tantalum range has been specifically developed for use with hot, highly corrosive liquids. The tantalum surface allows Alfa Lavalís new heat exchangers to be used with most corrosive media at temperatures up to 225įC (437įF). Unlike many high-grade alloys they can be used with mixed media and at variable concentrations.

Minimal maintenance costs

The high chemical resistance and robust design minimizes service needs. The only required maintenance is a cleaning-in-place procedure if the heat exchanger is operating in a fouling duty. The highly turbulent flow helps reduce fouling and makes cleaning-in-place procedures more effective.

The steel core gives Alfa Laval tantalum heat exchangers high mechanical stability. The robust design gives them much greater resistance to thermal shock than glass, silicon carbide and graphite heat exchangers.

Compact size and small footprint

The new Alfa Laval tantalum heat exchangers are based on plate technology. Thanks to a highly turbulent flow they have a significantly higher thermal efficiency than a shell-and-tube.

When comparing the efficiency of a shell-and-tube made of non-metals, such as graphite, glass or silicon carbide, and an Alfa Laval tantalum heat exchanger the different heat conductivity and required thicknesses of the materials must be considered. By combining superior flow characteristics with the improved heat transfer properties, the new tantalum heat exchangers provide up to 100 times higher thermal efficiency than non-metal shell-and-tube units.

This results in Alfa Laval tantalum heat exchangers having a much smaller footprint than designs based on graphite, glass or silicon carbide, thereby minimizing installation costs and allowing plant owners to expand capacity on existing floor space.

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