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Frequently Asked Questions
Why are slurry pumps so inefficient compared with clean-water pumps?
Because efficiency is traded for life deliberately. Thick vanes, large passages and generous clearances all cost hydraulic efficiency and all extend the interval before wear stops the pump working. Comparing a slurry pump with a clean-water pump on efficiency alone misses what it is designed to do.
High-chrome or rubber lined - how do I choose?
By the solids. High-chrome white iron resists sliding abrasion from fine, hard, angular particles and is the default for mineral duty. Elastomer linings absorb impact and suit coarser rounded solids, but are cut by sharp edges and attacked by oil and heat. Choosing wrongly is the commonest cause of unexpectedly short life.
Why does speed matter so much?
Wear rate rises very steeply with impeller speed, considerably faster than in proportion. A larger pump run slowly outlasts a smaller one run fast at the same duty by a wide margin, which is why slurry pumps are routinely oversized and geared down rather than run near their maximum.
What impeller types are used?
Open and recessed or vortex impellers, with fewer and thicker vanes than a clean-water pump. Recessed impellers keep most of the solids out of the impeller path entirely by inducing a vortex, which suits stringy or very coarse material at the cost of further efficiency.
How is wear monitored?
By tracking performance against the original duty and by scheduled inspection of liners and impeller. Falling head at a given speed indicates clearance loss. Because liners are sacrificial and designed to be replaced, planned inspection intervals are far cheaper than running to failure and damaging the casing.
What suction conditions do they need?
Generous ones. Slurry increases the effective NPSH requirement and settles in horizontal runs, so short, direct, adequately sized and self-draining suction pipework matters more than on clean-water duty. Poor suction on a slurry pump causes both cavitation damage and settling blockages.
Can a sludge pump handle abrasive slurry?
Not necessarily - sludge and slurry are different problems. Sludge is typically viscous with organic solids and needs passage size and sometimes chopping; slurry is abrasive mineral particles and needs wear-resistant materials. A pump specified for one may wear out quickly on the other.