High Head Slurry Pump: What to Know

Pump Design Features

• Impeller: Front and rear pump-out vanes reduce internal circulation and protect the seal; straight or semi-open vane options available.

• Liners: Heavy-duty high chromium liners bolted actively to the casing, not unstable adhesives.

• Throatbush: Secured with cotters for wear adjustment to maintain efficiency.

• Sealing System: Gland packing, expeller (low-flow or dry-running options), and mechanical seals (various materials) to suit different conditions.

• Bearing Assembly: High-quality tapered roller bearings, larger shaft diameters, reduced overhang for long life.

• Casing: Split-case design for easy access; cast ductile iron with extensive external ribbing, pressure rating up to 750 psig, suitable for series pumping.

• Base: One-piece base with alignment correction mechanism; overhead, side-by-side, or direct-coupled mounting options.

Applications

• Mineral extraction and processing

• Highly abrasive slurries

• Mine waste and tailings

• Power plant ash and coal

• Gravel and sand

• Paper and pulp

• Alumina, fertilizer, acid neutralization

• Chemical intermediates, dyes, solvent transfer

• Filter press feeds and pipeline booster stations

Shaft Seal Arrangement

• Gland Seal: PTFE and graphite packing suitable for highly corrosive or high-temperature conditions.

• Expeller Seal : Uses reverse centrifugal force to prevent leakage; applicable when positive inlet pressure is less than 10% of discharge pressure.

• Mechanical Seal: Integrative construction, easy installation and replacement, excellent abrasion and vibration resistance for difficult conditions.

Model Selection & Flow Range Coefficient

• Medium density, strong abrasive slurry: flow range coefficient 40–80%

• Low density, high abrasiveness slurry: flow range coefficient 40–100%

• Best efficiency point (BEP) corresponds to 100% flow coefficient

peration & Maintenance

• Follow safety procedures during installation, operation, and maintenance.

• Select the correct rubber or metal lined model based on slurry characteristics.

• Regularly inspect and repair the shaft seal.

• Adjust impeller clearance as necessary.

• Replace worn parts.

• Check bearing lubrication.

• Keep idle pumps clean and in good condition.

Benefits & Technology

• Wide application range, high efficiency, easy maintenance, excellent cost-performance ratio.

• Rubber-lined pumps can use multistage tandem technology for long-distance transport.

• Concentric casing and recessed impeller design reduce product degradation and shearing.

• Can pump slurries with up to 30% entrained air without air locking.

• Large solids passage without clogging.

• Heavy-duty concentric casing eliminates radial loads, extending pump, seal, and bearing life.