Tough pumps handle aggressive media

Citation

(2002), "Tough pumps handle aggressive media", Anti-Corrosion Methods and Materials, Vol. 49 No. 6. https://doi.org/10.1108/acmm.2002.12849fad.010

Tough pumps handle aggressive media

Tough pumps handle aggressive media

Keywords: Pumps, Fluids, Abrasives

Fluids handling applications which involve aggressive or abrasive media present tough challenges for pumps. Also, in certain designs of pumps, areas of stress can be concentrated or localised, resulting in premature seal and diaphragm failures. To meet these challenges liquids handling specialists Michael Smith Engineers have introduced the CODIP range of tubular diaphragm pumps which they state are engineered to withstand the effects of viscous, abrasive and corrosive fluids, even at high temperatures (Plate 5).

CODIP pumps are said to combine the benefits of hydraulic actuation with the versatility of air operation, plus the advantage of double containment. Double containment is an important feature of the tubular diaphragm concept because it addresses the growing demand for sealless pumps and reportedly ensures zero leakage in the event of diaphragm failure.

Plate 5 Tough pumps handle the most aggressive media – Michael Smith Engineers

Codip pumps function without any mechanical linkage, electric motor of mechanical seal. They operate using an external automatic air valve which directs air pressure to the rear of a flexible rubber diaphragm, while an inert liquid transmits this pressure uniformly to the tubular diaphragm and through to the process liquid. This design is said to eliminate the potential stress points which are associated with conventional mechanically actuated double diaphragm and peristaltic pumps and so minimises down-time and maintenance costs.

The Codip range comprises five models, which cover flow rates from 20 l/min, up to 300 l/min with heads of 10 bar at temperatures up to 180°C.

Other features claimed of the pumps include pure hydrostatically pressed PTFE wetted parts which are stated to be guaranteed against permeation for all corrosive chemicals and blends, dry self- priming, run dry capability and dead heading without damage and an elastomeric air membrane which eliminates the need for complex hydraulic systems. Among the material options available are Viton, Hypalon, EPDM or Neoprene construction for extremely abrasive or corrosive liquids. An electronic or electropneumatic leak detection system, (P55 or explosion proof zone 1 and zone 0), can also be provided.

As well as their suitability for applications involving corrosive liquids and solvents, CODIP PTFE tubular diaphragm pumps are also suited to handling ultra-pure media in pharmaceutical applications in addition to paints, varnishes, glues, inks and resins. The rubber tubular diaphragm version is more suited to handling liquids and scurries with abrasive solids in suspension.

Details available from: Michael Smith Engineers, Tel: +44 (0) 1483 771871; Fax: +44 (0) 1483 72 3110; E-mail: info@michael-smith-engineers.co.uk; Web site: www.michael-smith-engineers.co.uk