Peristaltic Pump Applications

Where Seal-Less Hose Pumps Outperform AOD, PC, Gear & Lobe Designs

Our earlier article “Characteristics of Industrial Peristaltic Pumps” described modern hose-pump design. This article focuses on the applications that benefit most from the unique, seal-less nature of peristaltic pumps.

Peristaltic hose pumps are frequently chosen in place of air-operated diaphragm (AOD), progressing-cavity (PC), gear and rotary-lobe pumps for the following duties:

• Shear- and emulsion-sensitive fluids — Gentle pumping preserves product consistency (paints stay at the correct viscosity, cornstarch does not thicken prematurely, egg whites remain intact).
• Slurries, sludges and viscous fluids — Ability to handle abrasive particulate and high-viscosity materials without rapid wear of internal components.
• Contamination control — The pumped fluid contacts only the hose interior, eliminating a leakage path that can either contaminate the process or release product into the environment.
• Suction lift, self-priming and dry-running — Superior performance on these common inlet conditions compared with most other positive-displacement designs.

The common denominator across virtually all peristaltic applications is lower operating cost — a combination of reduced maintenance (parts and labor), higher reliability, and improved product quality. Conventional pumps leak, clog or corrode because they rely on seals, valves, diaphragms or rotors that are in continuous contact with the process fluid.

Advances in hose materials and multi-layer construction have extended the number of compressions a hose can withstand before replacement, further improving cost-effectiveness. Because the hose is the primary wear component, maximizing hose life directly improves overall economics.

Chemical Processing Industry (CPI)

Many chemical-processing applications involve non-water-based fluids where either personnel safety or product purity benefits from complete isolation of the process fluid. Peristaltic pumps excel at additive transfer and dispensing duties.

A classic example is paint and dye transfer. These materials are frequently shear-sensitive and viscous. The gentle, low-shear action of a hose pump, combined with excellent suction-lift capability, supports efficient transfer. Cross-contamination is eliminated simply by changing the hose rather than flushing with expensive solvents that then become hazardous waste. The reversible nature of the pump also allows a single unit to transfer product both to and from an applicator.

Water & Waste Treatment (WWT)

WWT applications center on reliable chemical dosing and the transfer of abrasive sludge and grit. Seal-less peristaltic pumps are ideal for metering sodium hypochlorite, coagulants and other treatment chemicals — many of which are shear-sensitive and lose effectiveness when over-agitated.

AOD pumps are frequently replaced because sticky polymers clog check valves, high back-pressure causes stalling, and cold weather freezes the air supply. Peristaltic pumps have no valves, can generate higher discharge pressures, and are unaffected by ambient temperature. Removing AOD pumps also reduces compressed-air demand.

Abrasive flocculants, sludge and gritty scum are transferred without leakage thanks to the seal-less design and the pump’s ability to develop the necessary suction and discharge pressure.

Food & Beverage Manufacturing

Peristaltic hose pumps are widely used to dose, mix and transfer food ingredients because of their accuracy and ease of clean-up. Only the hose contacts the product; FDA- and EC-compliant hose materials are readily available.

Ingredients that must remain whole (nuts, fruit pieces in dough) and shear-sensitive products such as cream, milk and yogurt all benefit from the gentle pumping action. Abrasive materials such as vitamin powders are handled without internal wear of the pumping mechanism, reducing contamination risk.

Winery Applications – A “Must-Have” Pump

Wineries use peristaltic pumps for transferring must (whole, de-stemmed or pressed grapes), lees and finished wine. The low-shear action minimizes oxidation, emulsion and damage to grapes or seeds. The same pumps handle tank-to-tank transfers for settling and blending as well as barrel racking. Unlike flexible-impeller pumps, peristaltic units can run dry and vacuum a sump or vessel quickly without damage.

Solving Common Process Problems

With flow rates ranging from 18 GPH to more than 200 GPM and discharge pressures exceeding 200 PSI, modern peristaltic hose pumps solve many of the reliability and maintenance issues associated with other positive-displacement designs. Their simple, easy-to-clean construction makes them a practical choice across chemical, water-treatment and food-processing plants.

Additional Resources

• Download the Peristaltic Hose Pump Applications PDF
• Characteristics of Industrial Peristaltic Pumps
• Vector Peristaltic Pump Overview