Verderflex’s Dura provides Peace of Mind Pumping and Less Maintenance Call Outs


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Industrial sites and water companies are increasingly adopting unmanned plant operation that places a premium on service interventions. A pump or system issue results in a call out with the associated time-consuming journey to get to the plant before starting work. Consequently, the impact of issues such as clogged pumps, adjustment of worn parts, dry running burnt outs and routine component changes are much more than the simple “on site” time to resolve the issue.


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Peristaltic pumps with extruded, non-reinforced tubes address many of these problems but still require regular component changes. Increasingly, Verderflex Dura Hose Pumps are being used on unmanned plants to lengthen the period between site visits, providing peace of mind pumping and extended routine maintenance intervals.

Around the world, the users report that the Dura has solved many pumping problems including:

Eliminate Abrasive Wear Costs: Lime or Kalkmilch and Soda Ash are very common pH adjustment chemicals used in water treatment, industrial waste remediation and process acidity control. Lime and soda ash slurries contain highly abrasive, fine particles. In other industries, similar wear problems result from pumping kieselguhr, cement slurry, high grit content wastewater sludges and high solid content mining slurries. These particles cause severe stator, impeller and valve and seat wear on different technologies, all resulting in high pump ownership costs. Verderflex has many years’ experience solving these pumping problems and peristaltic pumps are accepted as the proven valve free, solution to pump lime and similar slurries. The smallest sizes, the lower flow Dura 5 and 7 have extended this proven performance to lower flow rates situations typical in lower flow, rural pumping stations.

Kill Clogging Costs: Viscous, “sticky” coagulants like Ferric Sulphate and Soda Ash, clog metering pumps causing pump strip downs and requiring frequent cleaning. The Dura’s re-enforced hoses generate a powerful suction force eliminating both the consequential clogging maintenance costs and the performance variability caused by minor viscosity fluctuations. Additionally, the truly reversible Dura can pump backwards to clear system blockages. Often by simply sending a signal from afar to the pump’s inverter, the pump runs in reverse for a short period clearing such problems without even needing a site visit.

No Dry Running Problems:

Progressing cavity pumps cannot tolerate any interruption in their liquid feed lines.


Dura 55 pumping lime slurry that caused severe abrasive wear on progressing cavity pumps at a major UK Water treatment plant

The result is costly burnt stators and lengthy maintenance downtime. Typical dry running causes include empty feed tanks, blocked lines and choked valves. Dura hoses are externally lubricated and bring care-free, operator proof pumping to lower flow requirements.

Eliminates Wet Priming: All Dura’s can genuinely self-prime, with a 9.5m lift of water, and evacuate air from their feed lines. This precludes pre-wetting and priming procedures associated with lower volume chemical feed systems, saving unnecessary processes and the associated labour time.

Fit and Forget Pumping: Extended Routine Maintenance Intervals:

The long life, heavy duty re-enforced Dura hoses have service lives in the thousands of hours - almost fit and forget pumping. The easy to change hose is the only service part, minimising both downtime and service interventions dramatically with infrequent servicing. The infrequent on site changeovers can be made by semi- skilled staff, lowering the ownership cost even further.

Carefree Pumping of Off Gassing Liquids: Municipalities regularly use Sodium Hypochlorite (“Hypo”) or Peracetic Acid (PAA) for disinfection. When pumped, these liquids off gas, vapour locking a diaphragm pump’s chamber resulting in additional degassing valves or complex “switch to prime” controls. Often pumps

are set to “over-dose” to compensate for the loss of performance and consequently increase chemical usage. Sometimes, they run with minimum back pressures to keep the gases entrapped in the liquid, stressing a system’s valves. Alternatively, pumps are over-sized with lower stroke settings and reduced pump speeds which aggravate removal of gas pockets in the pump head.

Hose pumps are a well proven solution and also address the associated reagent crystallisation issues and downtime from metering pump’s coated seats when chemical flows are interrupted resulting in a loss of performance whereas the abrasion resistant Dura 5 & 7 pumps maintain flow rates.

Kill ancillary valve costs:

Diaphragm pumps need strainers, back pressure and check valves, all items that can wear out or fail and are unnecessary with a peristaltic pump. Elimination of these ancillary items result in less items that clog or fail.

Reduce Chemical Usage:

Peristaltic pumps have a gentle, low shear pumping action reduces the flocculation chemical volumes. In contrast, traditional solutions often shear flocculent particles, increasing chemical use and result in higher operating costs. Metering pumps also lose accuracy when flow rates or system pressures change due to feed tank levels, however, the powerful restitution of the Dura hose gives consistent dosing accuracy even with varying operating conditions.

Future Proofed Scalable Performance: Villages and towns continue to expand in size and consequently, the volume of water to clean or waste to process increases. The Dura 5 and 7 have the same common casing and mounting frames as the Dura 10. Should system demand change, flow rates are easily scaled up on site or down by replacing the hose and a few standard components.

The Dura is just one example of Verderflex’s problem solving peristaltic pump range finding applications many different industries. Most recently, another family member, the precision Vantage 5000 has found itself at the heart of the world’s intensive development to develop Covid-19 test kits by aseptically dispensing the in-vitro base media at the core of the test process. This illustrates the extensive range of problems solved using peristaltic pumps.

For more information please contact:

An array of 10 Dura 15 pumping viscous Ferric Chloride in the USA Enquiry No. 7


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