Plant Uses Peristaltic Pump to Move Lime Slurry

Verderflex has revealed how its Dura 35 peristaltic pump is helping the Sioux Falls water purification plant in South Dakota to feed slaked lime slurry to its softening basins more effectively. Lime slurry is a dense product to transfer with a high solid content of up to 35 per cent. Due to the slurry's abrasive nature, which causes wear on progressive cavity pumps with consequent downtime and operating costs, Sioux Falls opted to use a peristaltic pump for the transfer process.

Peristaltic or hose pumps use alternating compression and relaxation of a reinforced hose to push liquid through pipework. The resulting vacuum, caused by the repeated cycle, draws more product into the hose. According to Verderflex, peristaltic pumps are accurate and repeatable dosing pumps where the pumped product is totally contained within the hose, eliminating the possibility that any moving parts can clog or corrode. This makes a peristaltic pump a suitable choice for pumping high-solid-content slurries such as lime.

Sioux Falls' largest obstacle when deciding on a suitable pump was the amount of available space. It wanted to continually pump approximately 2.25 litre/min, which would normally mean a sizeable pump with a large motor and gearbox. The Dura 35's space-saving design, with a vertical motor and gearbox, reduces the pump's footprint. It is capable of pumping up to 5.5m3/hr at pressures up to 12 bar - more than enough for Sioux Falls, which wanted to pump at slightly more than 4 bar, 24 hours a day, seven days a week. Although the pump has been running continuously for more than 8,000 hours, Dura pumps are designed with quick and easy maintenance in mind.

When the plant needs to change the hose, a simple taper-fit flange design makes hose changes easy and keeps downtime to a minimum. The introduction of Verderflex's Dura 35 peristaltic pump at Sioux Falls has been successful, and additional pumps have already been installed at the site.

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