Robust, close-coupled thermoplastic pumps

A good example of this is the range of ARBO thermoplastic mechanically sealed centrifugal pumps made from either polypropylene, polyethylene, PVDF and PTFE, which are available in the UK from Michael Smith Engineers.

ARBO pumps are machined from solid block and a manufacturing process that involves no injection moulding or welding, which eliminates the potential for stress-cracking and so ensures robust, reliable, corrosion resistant pumping.

They are available in three configurations, including the SealPro closed-coupled design which handles flows up to 50m3/h, heads to 45m and maximum suction pressures up to 1.5bar with standard seal.

They are suitable for the safe and efficient transfer and circulation of corrosives, including  liquids containing solids and also viscous liquids up to 200cP.

The pumps incorporate a single internally flushed rotating seal made from PTFE-graphite or silicon carbide, which is mounted on the impeller so there are no wetted metallic seal components. As none of the seal components touch either the sleeved pump shaft or the pump housing, this means the only wearing parts are the seal faces.

An internal circulation system ensures that the seal rings are always within the liquid zone and continuously flushed with the medium being pumped. This provides sufficient cooling and cleaning of the liquid surface at all times and optimises pumping efficiency.