What is a Peristaltic Pump and When is it Used?
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What is a Peristaltic Pump and When is it Used?
Peristaltic pumps are one of the most specialized pump types in industrial and environmental applications. They handle fluids that destroy other pump types — highly aggressive chemicals, abrasive slurries, sterile biological materials, and contaminated fluids where cross contamination must be prevented. Understanding when a peristaltic pump is the right choice saves equipment costs and ensures the right tool is matched to the application.
Here is everything you need to know about peristaltic pumps and when to use them.
What is a Peristaltic Pump?
A peristaltic pump — also called a hose pump or tube pump — is a positive displacement pump that moves fluid by compressing and releasing a flexible tube or hose. The pumping action mimics the peristaltic motion of the human digestive system — the same squeezing action that moves food through the intestines.
The pump consists of a circular housing containing a rotor with rollers or shoes mounted on it. A flexible tube or hose is routed around the inside of the housing. As the rotor turns the rollers compress the tube progressively, squeezing fluid forward. As each roller passes a section of tube the tube springs back to its original shape creating a vacuum that draws more fluid in from the suction side.
The critical feature of a peristaltic pump is that the fluid only ever contacts the inside of the tube. The pump mechanism itself never touches the fluid. This fundamental design characteristic makes peristaltic pumps uniquely suited for certain applications.
How Does a Peristaltic Pump Work?
Step 1 — Rotor begins to turn The motor drives the rotor to rotate. Rollers mounted on the rotor contact the flexible tube on the inside of the pump housing.
Step 2 — Rollers compress the tube As each roller passes along the tube it compresses the tube completely, trapping a fixed volume of fluid between two rollers and pushing it forward toward the discharge.
Step 3 — Tube springs back Behind each roller the compressed tube springs back to its original shape creating a partial vacuum that draws fluid in from the suction side.
Step 4 — Continuous pumping action The continuous rotation of multiple rollers creates a nearly continuous pumping action with moderate pulsation. Flow rate is directly proportional to rotor speed — variable speed drives provide precise flow control.
Key Advantages of Peristaltic Pumps
Fluid only contacts the tube — the most important advantage. The pump mechanism never contacts the fluid. This makes peristaltic pumps ideal for:
- Aggressive chemicals that would destroy pump components
- Sterile fluids that cannot be contaminated by pump materials
- Hazardous fluids that cannot be allowed to contact pump internals
- Applications requiring easy cleaning and decontamination between uses
Simple maintenance — the only wear component is the tube or hose. When it wears replace the tube. No seals, no impellers, no complex disassembly. Tube replacement takes minutes.
Gentle pumping action — no high speed impeller rotation means low shear pumping that preserves the integrity of shear sensitive fluids.
Self priming — peristaltic pumps prime easily and handle fluids with entrained air or gas without losing prime.
Runs dry safely — unlike centrifugal pumps peristaltic pumps can run dry without damage for short periods. The tube may wear faster but the pump will not be destroyed.
Reversible — reversing motor rotation reverses flow direction. Useful for cleaning lines and emptying hoses.
Accurate metering — precise flow control through speed adjustment. Used for chemical dosing and sampling applications requiring accurate delivery.
Handles solids and abrasives — the squeezing action passes soft solids and handles moderately abrasive fluids. The tube takes the wear rather than precision machined pump components.
Limitations of Peristaltic Pumps
Tube wear — the tube is a consumable wear item. In abrasive or aggressive chemical service replacement intervals can be short. Tube cost and replacement frequency must be factored into total operating cost.
Pulsating flow — the roller action creates flow pulsation. For applications requiring smooth flow pulsation dampeners may be needed.
Pressure limitations — standard peristaltic pumps have lower maximum pressure ratings than centrifugal or progressive cavity pumps. Industrial hose pumps handle higher pressures than tube pumps.
Flow rate limitations — peristaltic pumps are generally lower flow rate devices compared to centrifugal pumps. For high volume applications other pump types are more appropriate.
Peristaltic Pump Applications
Groundwater sampling — the most common environmental application. Peristaltic pumps are the standard tool for purging monitoring wells and collecting groundwater samples. The fluid only contacts the tubing — easy to decontaminate between sampling locations by replacing the tubing. Provides the low flow rates needed for low flow sampling protocols.
Chemical dosing — precise metering of treatment chemicals in water treatment, wastewater treatment, and industrial process applications. Accurate flow control, easy calibration, handles aggressive chemicals safely.
Pharmaceutical and biotech — sterile fluid transfer where contamination from pump components cannot be tolerated. Single use disposable tubing eliminates cross contamination between batches.
Food and beverage — gentle handling of food products with hygienic construction and easy cleaning. Handles shear sensitive products like cream, yogurt, and fruit pulp without damage.
Mining slurry transfer — industrial hose pumps handle highly abrasive mining slurries. The hose takes the wear and is replaced periodically — far cheaper than replacing precision pump components.
Wastewater treatment chemical feed — dosing polymers, coagulants, and other treatment chemicals in wastewater treatment applications.
Peristaltic vs Progressive Cavity Pumps
Both handle difficult fluids but have different strengths:
Peristaltic pumps — fluid contacts only the tube, easiest cleaning and decontamination, lower flow rates, better for precision low flow metering and applications requiring absolute fluid isolation from pump components.
Progressive cavity pumps — higher flow rates and pressures, better for continuous high volume viscous fluid transfer, fluid contacts rotor and stator.
For low flow precision applications and maximum fluid isolation peristaltic pumps win. For higher volume continuous viscous fluid transfer progressive cavity pumps are more appropriate.
How Flowcor Equipment Can Help
Flowcor Equipment sources peristaltic pumps and specialized fluid handling equipment for environmental contractors, industrial facilities, and municipal applications across the U.S. Tell us your fluid characteristics, flow requirements, and application and we will recommend the right equipment and get you a quote within 1 business hour.
Submit a quote request at flowcorequipment.com or call us at 610-241-6770.