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Pump Rotor and Stator Refurbishment: Knowing the Right Signs When This is Needed

December 9, 2016

The relationship between a pump rotor and stator is unforgiving. They share a load. That load is felt as mechanical abrasion, as an electrical overload, and as bearing stress. Pump rotor and stator refurbishment procedures check the pump for these right signs, identify the telltales, and record them so that the refurb department can regenerate the aged mechanism.

The Contrasting Profiles of a Progressive Pump

Unique among its peers, this pump type uses two distinctly different materials in the relationship we mentioned up top. The rotor is shaped as a solid screw-like shaft, a component that rotates on an eccentric lateral axis within a flexible stator. The stator is made from a flexible but mechanically rugged elastomer. Because of these contrasting material differences, wear factors are harder to predict but certainly not impossible. The stator will generally age faster than the hardened rotor.

Detecting Exterior Telltales

Performance factors always act as the initial metric here, for wear incidents will generally affect the ability of the pump to transfer its fluid load. Check for signs of load spikes first, then look deeper by inspecting the full pump cycle for unusual behavior. Heat and a smell of burning rubber indicate an abrasive issue within the stator. Cavitation, the formation of imploding bubbles, is caused by poor pocket progression, but the same issue can also be generated by a suction side leak, so eliminate the possibility of a leak before blaming the stator and rotor relationship.

Exploring Interior Surfaces

Four of the human senses tell us a great deal about what's going on inside the pump. Don't use the fifth sense. Pumps are not for licking. Hot to the touch, vibrating sharply, an educated hand learns part of the failure picture. Likewise, abrasive contacts propagate as sound while the nose picks up the scent of burning rubber. Still, only an interior inspection will reveal the whole picture. Ridges and score marks on the rotor, for example, indicate a troubling abrasive event. The stator indicates its woes in a different manner, as surface blisters and cracks, damage that has been produced by parts-wearing rubbing. It's a mess in here, so let's refurbish the pump.

Refurbished rotors are machined until surface defects are erased. Stators are generally replaced with brand new elastomeric components. The rotor even receives a shiny new coating, a finish that double coats the newly rejuvenated alloy with a chrome plated layer of robust metal. All-in-all, the reconstructed pump is fault-corrected, refurbished, and ready for reinstallation.

Contact Alpha Pumps:

Phone:    (03) 9311 7188
Fax:          (03) 9364 9554
Mobile:    0403 030 830
Email:      alphapumps@optusnet.com.au

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