What is a peristaltic pump?
A pump that is designed to use positive displacement to squeeze a leak-proof tube or hose, forcing the pumped fluid through the hose. It is one of the few types of pumps in which the fluid being transported does not come into direct contact with any parts of the pumping mechanism. This makes it ideal for pumping fluids that either need to be sterile or should not leak into the environment.
Peristaltic pumps generally work within the following ranges:
- Flow rate ranges between .2 and 200 gpm
- Total head (pressure) ranges between 10 and 250 psi
- Horsepower ranges between 0.125 and 40 hp
How do they work?
There are two main parts inside the pump: the hose and the rotor. The hose, which must be made of a tough, chemical-resistant material that allows no leakage of air or liquid, runs along the outer wall inside the circular pump chamber. The rotor sits in the middle of the pump chamber and moves in a circular motion. As the rotor turns, rollers or shoes that are attached to the rotor compress the hose, thus forcing the fluid toward the outlet of the pump while creating a vacuum that draws more fluid into the pump inlet. Most peristaltic pumps are electrically powered. Depending on the size of pump and the method that is used to squeeze the hose, there may be oil inside the pump chamber to lubricate the outside of the hose as it is squeezed.
The selection of the correct hose type and material is the most critical aspect of the proper application of peristaltic pumps. The hose must be of the correct material so that it won’t corrode or wear prematurely as the hose is squeezed, which could cause a leak in the hose. Normally, the hose can be replaced when it is worn.
Where are they used?
Peristaltic pumps are used in applications where leakage of the pumped fluid can’t occur, or where the fluids are aggressive or potentially dangerous. They are used in some chemical metering applications, such as pumping chlorine for disinfection of swimming pools, as well as a variety of medical applications, such as IV pumps and dialysis machines. Peristaltic pumps are also used in industrial and municipal applications involving corrosive and abrasive liquids. They’re useful in scientific research handling hygienic or volatile fluids, and they are used in smaller sizes for applications such as pumping ink in commercial sized multi-color printers.
Here are a few peristaltic pump manufacturers to consider.
Watson-Marlow Fluid Technology Group manufactures positive displacement pumps for a wide range of industries, including mining, pulp & paper, industrial, water & wastewater, food & beverage, bio-pharmaceutical, and chemical. Founded over 60 years ago, the U.K.-based company distributes their pumps in over 75 countries worldwide.
The Abaque Series of peristaltic pumps is manufactured in Auxerre, France by Mouvex, a part of the Pump Solutions Group. The peristaltic hose pump line is built to handle abrasive, aggressive, and potentially viscous shear sensitive fluids. The pump can work with fluids up to 185,000 ssu, has a flow capacity to 339 gpm and a max pressure to 232 psig, and is self-priming. The Abaque series pump features a seal less design and is ideal for mining, ceramics, water treatment, food, chemical processing, and related applications.
Centrifugal pumps can sometimes be noisy, perform poorly, break shafts, and cause other problems. This is often due to one of many pump suction conditions.
Broken shafts are a regular occurrence when operating a centrifugal pump, but it doesn't have to be. This article highlights why pump shafts break and what can be done to prevent the damage from happening.
So now what do you do? As many of you know, this is a fairly common occurrence, particularly with pumps that have been around a long time. Here's some advice on what to do.
Godwin Pumps provides 350 Dri-Prime pumps from eight of its East Coast branches to help with the clean up of Hurricane Irene.
Colfax Fluid Handling recently introduced its Allweiler All-Optiflow series of progressing cavity pumps for use in waste, wastewater treatment and paper manufacturing applications.
At a recent energy innovation conference, U.S. Energy Secretary John Chu said that recent breakthroughs will soon have solar and rechargeable batteries "going viral" across the globe much the same as cell phones, the MSNBC Future of Tech blog reports.
According to a company press release, Jeff Wiemelt will assume the role of president for the Sundyne on January 1, 2012. Wiemelt previously held vice president and general manger of Sundyne Americas and Sundyne Dijon in France.
Xylem introduces its Flowtronex Silent Storm Express (SSE) variable speed pumping system. The system was designed to advance remote pump control, with Variable Frequency Drive (VFD) efficiency. The SSE provides golf course maintenance managers with power management tools for a more green/sustainable solution.
Almatec, a leading manufacturer of AODD pumps will feature its BIOCOR Series Pumps at this years Anuga FoodTec trade show. The show targets the food and drink processing industry and will be held from March 27-30, 2012, in Cologne, Germany.