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A Newbie's Guide To Pumping Slurry

When you've ever pumped slurry, you know that it might be one of the most challenging fluids to move. It is abrasive, thick, sometimes corrosive, and contains high amounts of solids. No doubt about it, slurry is tough on pumps. But the more you understand about what you are pumping, the higher your pump selection becomes, setting you up for longer mean time between failure.

WHAT IS A "SLURRY"?

Slurry is any combination of fluid, like water, and a pulverized solid. Slurries are used as a convenient way to handle solids in bulk in mining, steel processing, foundries, power generation, and most lately, the Frac Sand mining industry. Slurries usually behave the same way as thick, viscous fluids, flowing under gravity, but in addition pumped as needed.

Slurries are divided into basic classes: non-settling or settling. Non-settling slurries encompass very fine particles, which give the phantasm of elevated apparent viscosity. These slurries often have low wearing properties, but do require very careful consideration when deciding on the suitable pump because they do not behave in the identical manner as a standard liquid does.

Settling slurries are formed by coarse particles that are likely to form an unstable mixture. Particular consideration must be given to flow and energy calculations when choosing a pump. The keyity of slurry applications are made up of coarse particles and because of this, have higher wear properties.

Selecting the proper pump for slurries is critical to get the most bang for your buck. Basic pump parts, such as the impeller dimension and design, material of building, and discharge configurations must be considered to make sure the pump will hold up in opposition to the wear caused by an abrasive slurry. Slurry pumps are generally larger in size when compared to low-viscosity liquid pumps and normally require more horsepower to operate because they're less efficient. Bearings and shafts should be more rugged and inflexible as well.

Many types of pumps are used for pumping slurries, however the commonest slurry pump is the centrifugal pump (pictured above). The centrifugal slurry pump makes use of the centrifugal force generated by a rotating impeller to impact kinetic energy to the slurry, much like how a water-like liquid would move by a normal centrifugal pump.

f you could have expertise pumping slurries, you know it's not a straightforward task. Slurries are heavy and tough to pump. They cause excessive wear on pumps and their parts and are known to clog suction and discharge lines if not moving fast enough. Most significantly, it’s a challenge to make slurry pumps final for a reasonable amount of time. But, there are a number of things you are able to do to extend the life of your slurry pump and make pumping slurry less of a challenge.

Discover the sweet spot that enables the pump to run as slow as potential (to reduce wear), however fast enough to keep solids from settling and clogging the lines

To reduce wear, lower the pump’s discharge pressure to the lowest level potential

Follow proper piping principles to ensure a constant and uniform delivery of the slurry to the pump

Pumping slurries poses a number of challenges and problems, but with proper engineering and equipment choice you can expertise a few years of worry-free operation. It is important to work with a certified engineer when selecting a slurry pump because slurries can wreak havoc on a pump if not properly selected.

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