Slurry pump

A slurry pump is a type of pump designed for pumping liquids containing solid particles. Slurry pumps change in design and construction to adjust to multiple types of slurry, which vary in concentration of solids, size of solid particles, shape of solid particles, and composition of the solution. Slurry pumps are more robust than liquid pumps; they have added sacrificial material and replaceable wear parts to withstand wear due to abrasion.

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Centrifugal, positive displacement, and vortex pumps can be used for slurry. Centrifugal slurry pumps can have bearing-supported shafts with split casing or rubber- or metal-lined casing. Configurations include horizontal, vertically suspended, and submersible.

Slurry is usually classified according to the concentration of solids. Engineering classification of slurry is more complex and involves concentration, particle size, shape, and weight to determine abrasion severity. For engineering selection of slurry pumps, slurry is classified as class 1, class 2, class 3, and class 4.

Selecting slurry pumps is more difficult than selecting pumps for water and liquids. Many factors and corrections to the duty point affect brake horsepower and wear. Root-dynamic Centrifugal Slurry Pumps (ANSI/HI 12.1-12.6-2016) provides methods for calculating slurry pumps. The peripheral speed of the impeller is one of the main features and classifications of slurry pumps. Speed must be in accordance with the slurry type classification (abrasion classification) to maintain a reasonable life in service due to high abrasion of solids.

Before selecting an appropriate slurry pump, engineers consider capacity, head, solids handling capacity, efficiency and power, speed, and NPSH.

Slurry pumps are widely used to transport abrasive solids in industries such as mining, dredging, and steel. They are often designed to be suitable for heavy-wearing and heavy-duty uses. Depending on the mining process, some slurries are corrosive, which presents a challenge because corrosion-resistant materials like stainless steel are softer than high-iron steel. The most common metal alloy used to build slurry pumps is known as "high chrome," which is white iron with 25% chromium added to make it less brittle. Rubber-lined casings are also used for certain applications where the solid particles are small.

Components

Impeller

The impeller, made from elastomer, stainless steel, or high-chrome material, is the main rotating component and normally has vanes to impart centrifugal force to the liquid.

Casing

Split outer casing halves made of cast material contain the wear liners and provide high operation pressure capabilities. The casing shape is generally semi-volute or concentric, both of which are less efficient than the volute type.

Shaft and Bearing Assembly

A large diameter shaft with a short overhang minimizes deflection and vibration. Heavy-duty roller bearings are housed in a removable bearing cartridge.

Shaft Sleeve

A hardened, heavy-duty, corrosion-resistant sleeve with O-ring seals at both ends protects the shaft. A split fit allows the sleeve to be removed or installed quickly.

Shaft Seal

Types of shaft seals include expeller drive seal, packing seal, and mechanical seal.

Types

Submersible

Submersible slurry pumps are placed at the bottom of a tank, lagoon, pond, or another water-filled environment, and suction solids and liquids right at the pump itself. The materials are taken in at the intake and passed through a hose connected to the discharge valve.

Self-Priming

A self-priming slurry pump is operated from land, with a hose connected to the pump's intake valve. The self-priming pump draws the slurry to the pump and then discharges the material from there.

Flooded Suction

The flooded suction slurry pump is connected to a tank or hopper and uses gravity to move slurry and liquid from the enclosure. Located at the bottom or below the water, the pump uses the force of gravity to continuously fill the pump and then passes the material out through the discharge valve.

The Orion series slurry pump has been around since its creation in 1980. Born in Carlisle, UK, the Orion slurry pump entered a competitive market dominated by coal mining. It had a tough job finding its place in an arena saturated with competition. Launched initially as a metal pump, it was a competitive alternative to the market leader and significantly advanced slurry pump technology.

Since its inception, the Orion slurry pump series has offered:

• High sustained efficiency
• Total impeller wear clearance adjustment (Double Adjust Feature)
• Even hydraulic wear
• Back or front pull-out
• High-performance dry shaft seal
• Ease of maintenance
• Longer operating life

Over 40 years, the Orion series has undergone many changes, design enhancements, and additions to the range. However, it has never deviated from its original goals. During that time, the Denver Orion brand was established and is now part of Metso Outotec.

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