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ARBO thermoplastic pumps resist aggressive chemicals

Michael Smith Engineers has introduced a new range of ARBO thermoplastic mechanically sealed centrifugal pumps.

The pumps are available in a choice of polypropylene, polyethylene, PVDF and PTFE in order to resist the effects of aggressive chemicals, which can cause corrosion problems for metallic pumps.

By manufacturing all wetted parts out of solid block without the need for injection moulding eliminates the potential for stress-cracking. Furthermore, the combination of tough, non-metallic materials and stress relieving production methods provides chemical and temperature resistance to ensure safe pumping, even in the most challenging applications. As well as this, ARBO pumps can handle solid particles up to 3mm, ensuring extended pump operation in the event of process upset.

The pumps are designed to handle flows up to 500m³/hr, heads to 90m and are available in close, or long coupled designs.

In close-coupled configuration ARBO pumps can be specified in either horizontal or vertical mounting options. The close coupled design is a more compact choice as the pump shaft is fixed directly to the motor shaft. A separate bearing housing and flexible coupling are not required which means a significant reduction in wearing parts and also eliminates the potential for motor alignment issues.

The close-coupled vertical configuration suits in-line positioning and offers the advantage of the suction connection being able to be rotated 90º to the discharge connection to ensure maximum flexibility during system installation. With this option maintenance is simplified as the pipework remains connected and only the housing bolts need to be removed allowing the pump to be lifted using standard lifting lugs.

The long-coupled horizontal version incorporates separate frame-mounted bearing support for the motor shaft providing high stability and is designed so that the shaft, complete with bearings, can be removed as a cartridge to simplify the process of changing the bearing.

The complete long-coupled pump unit is assembled on a glass fibre reinforced polyester baseplate for chemical resistance while the back-pull-out design makes it possible to remove the rotating section without the need to dismantle the piping. Both the long-coupled and close-coupled designs are dimensioned to ISO 2558 / DIN-EN 22585 and so can be interchanged with existing metallic pumps on-site.

Typical applications for ARBO thermoplastic mechanically sealed centrifugal pumps include, but are not limited to:

• Pumping acids in anodising plants,
• Circulating aggressive chemicals in pickling lines,
• Tanker unloading of ferric salts in the water industry,
• Pumping chemicals and untreated effluent in electronics manufacturing.