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Mud pump material selection

13

2021-12

In a slurry pump, the impeller and the inside of the pump casing are always exposed to the slurry and must therefore be protected against wear accordingly.
"The choice of material for the impeller and pump casing is as important as the choice of the pump itself!"
 
Three different conditions that generate wear in slurry pumps.
Abrasion
Erosion
Corrosion
 
Abrasion: wear and tear
In slurry pumps, we have mainly abrasive and low stress wear.
The wear rate depends on particle size and hardness.
 
Wear in slurry pumps occurs in only two areas.
1. between the impeller and the fixed inlet.
2. between the shaft sleeve and the fixed packing.
 
Erosion.
This is the main wear of the slurry pump. The reason is that particles in the slurry hit the material surface at different angles.
The way the pump is operated can seriously affect erosion wear. Typically, erosion wear is lowest at BEP flow rates and increases as the flow rate increases and decreases.
For some poorly understood reason, erosion wear can also increase significantly if the pump is allowed to operate with "snoring"; that is, drawing air into the intake tube.
It is thought that this may be caused by cavitation, because the pump surface will vibrate when air flows over the pump surface. However, this is difficult to accept because air bubbles usually inhibit cavitation by moving to fill the vapor chamber.

mud pump

 
There are three main types of erosion.
Effects of erosion on pump components.
 
Impellers
The impeller is subject to impact wear (high and low), primarily on the eye, gland side shroud, and when the flow is rotated 90°. At the leading edge of the vane.
Slip bed and low angle impacts occur along the impeller between the impeller shrouds.
Side liner (into, back liner)
Side liners are susceptible to sliding bed, crushing and grinding wear.
 
Worm housing
The worm housing is subject to impact wear from cutting water. The rest of the worm shell is subject to sliding bed and low angle impact wear.
Corrosion: Wet parts in slurry pumps
Corrosion (and chemical attack) is a complex phenomenon for both metallic and elastomeric materials. As a guide, chemical resistance tables for metals and elastomeric materials are given below and in the Chemical Resistance Tables section.
 
Wear protection - what options are available?
When choosing wear protection for slurry pumps, there are some main options.
Impellers and housings made of hard metal from various white iron and steel alloys
Impeller in elastomer and casing protected by an elastomer liner. Elastomers are usually various qualities of rubber or polyurethane.
Combinations of hard metal impellers and elastomer lined housings.
 
Wear-resistant materials
Selection of wear parts: The selection of wear parts is a balance between wear resistance and cost of wear parts.
There are two strategies for resisting wear.
Wear-resistant materials must be difficult to resist the cutting action of impacting solids!
or
The wear-resistant material must be elastic in order to absorb the impact and rebound of the particles!
 
Selection parameters 
The selection of wear parts is usually based on the following parameters.
 
Solid size (solid SG, shape and hardness)
Slurry temperature
pH value and chemicals
Impeller speed in slurry pumps
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