Wear Ring

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Wear Ring

The wear ring is often used as a shielding measure to prevent the wear and tear of both the housing and impellers. The high abrasive wear of soft rubber in the wear ring collects sand and dust particles and enhances the lift of the machinery.

Rubber wear rings consist of metal inserts for stiffness during installation. Usually, wear rings are advised in sandy areas where higher abrasion is expected and spare parts can be quickly replaced.

The Need for Wear Rings

Pump wear rings are considered as essentials as they have a significant effect on pump reliability, performance and safety.

Many of the centrifugal pump designs have removable rotary wear rings on the impeller and stationary wear rings inside the housing (case wear rings). The wear rings fulfil three primary purposes:

  • Establish a contact area between revolving and stationary sections within the pump
  • Reduce internal recirculation from pump discharge to pump suction or between phases
  • Establish hydraulic forces that balance the rotor of the pump

The wear ring clearance affects pump discharge pressure, flow, performance, energy consumption, vibration and coalescence. The use of wear rings with decreased clearance has a positive effect on both of these aspects.

Advantages of Wear Rings

Long-term, large-scale field trials have shown that wear rings can increase pump life by up to 100%, minimise friction and reduce seal leakage. Field experiments and pump test stands have also shown that decreased clearance will increase pump performance anywhere from 2 to 5 percent for traditional process pumps. The additional advantages of the wear ring pump include:

  • Minimizing metal-to-metal touchpoints effectively reduces the possibility of galling or seizures
  • Wearing rings do not grab or gall during slow roll or orientation
  • The pump would have a greater tolerance to run-dry events as well as other process disruptions, with the probability of surviving prolonged off-design conditions
  • Higher vibration due to increased damping of the wear rings
  • Fewer seal leakage due to decreased pump vibration and reduced shaft deflection due to closer wear ring clearance.
  • Better quality due to lower leakage losses in the wear rings
  • Reduced chance of cavitation as tighter wear ring clearance increases NPSHR

If you want to know which product is correct for your application, please contact us with your pump datasheet and cross-section. Our experts can assist you to find the right match for your pump.

Why Choose Flextron?

At Flextron, we're focused on ensuring that you can make the most of your pump. Moreover, you can configure your product in any way that fits your specifications with Flextron. We have all sorts of supplies you need in stock and ready for instant shipping, just email us today!

Frequently Asked Questions

  • Metal Wear Rings: The traditional approach uses metal wear rings with an intrinsic risk of seizure. For API610, in order to reduce the chance of seizure utilizing metal rings, the impeller and case rings must have a hardness disparity of at least 50, or all rings have a hardness of more than 400. In addition, rings can use the generous clearance given for in the API610 11th Edition Specification for Centrifugal Pumps. In the case of hot pumps or pumps still in operation, clearance has been further improved.
  • Composite Case Rings: The new approach incorporates the use of metal propeller wear rings with case rings made of composite materials such as DuPontTM Vespel® CR-6100 and Boulden B-835. This upgrade removes the metal-to-metal touch points inside the pump, potentially eliminating the possibility of pump seizing. This improves the assembly, orientation and operation of the pump and helps the pump to operate efficiently with clearances considerably lower than the recommended clearances for metal sections of the API610.

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