Why are Peristaltic Hose Pumps Used?

In this article, we are going to discuss an industrial pump that is not quite as common as some of the others. This is a peristaltic hose pump, which is a type of positive displacement pump that is used for pumping a variety of different fluids. This type of pump is commonly used in the medical industry because it allows you to keep the pumping fluid separate from internal pump components and free of contamination. We will get into more details about this shortly.

Engineered Systems & Products (ESP) is here to help again when choosing and purchasing peristaltic hose pumps. We only supply top of the line products and provide unmatched service on the pumps and equipment in your system. ESP will be able to provide a cost-effective solution when it comes time to give your equipment an update as well. Our products page is where you will find more information about these pumps. You will also find lots of other equipment that we have to offer.

Let’s dive into some more information on peristaltic hose pumps. This article will discuss how they work, different design considerations, advantages, disadvantages, and how this type of industrial pump can benefit your company or operations.

How Do They Work?

Peristaltic pumps were first patented in the US by Eugene Allen in 1881. Later, around 1932, this style of pump was made popular by a heart surgeon named Dr. Michael DeBakey.

As mentioned previously, this is classified under the positive displacement category of industrial pumps. The pumping fluid is contained in a tube or hose that is fitted inside a circular shaped pump casing. The hose keeps the fluid from coming in contact with pump parts or anything else that can cause contamination. The next important component is the rotor that resides inside the circular pump casing. The rotor contains a number of rollers, or shoes, on its outside edge. The rollers (usually 2 or more) compress the flexible hose as they rotate which in turn pinches part of the hose and forces the pumping fluid to move through the hose. Next, the rollers continue to rotate around the rotor and eventually allow the hose to open back up to its natural state. As the hose opens back up, fluid flows back into the pump. This cycle repeats over and over again which ultimately sends precise volumes of fluid to the desired location. This process may be continuous or on a specific schedule when delivering small amounts of fluid.

Since the pumping fluid is contained inside of the hose and away from all contamination, peristaltic pumps are commonly used to pump fluids that need to be kept clean or sterile. As you may have guessed, they are commonly used in the medical industry in hospitals or doctor’s offices. One example would be when pumping IV fluids into the body of a patient. They are also used in heart-lung machines to circulate a patient’s blood during bypass surgery. However, they are not strictly used for medicine. Peristaltic hose pumps can be found in a wide variety of industries where it is important to keep the fluid free of contamination or when the pumping abrasive and viscous fluids.

Now that you have a better idea of why this type of pump is beneficial to your operations, we will go into more detail on some important design parameters that you will need to consider. But there is no need to worry about this. ESP can answer all of your questions and make sure you choose the correct equipment.

Peristaltic Hose Pump Design Considerations

Here are a few things to consider when designing a pump that is just right for you.

Chemical Compatibility

Since the fluid does not come in contact with any valves or seals, you do not have to worry whether or not these parts are compatible with your fluid. However, it is extremely important to make sure your hose is able to stand up to the pumping fluid. The hose needs to be able to maintain its elastic properties and withstand any chemical corrosion.

Occlusion

Simply put, occlusion is a measurement of the amount of squeeze that is put on the tube or hose by the rollers. This is very important because it directly affects the performance of your pump. More squeezing experienced by the hose, means a shorter life for the hose. However, less squeezing means that the fluid will be able to slip back which has a negative impact on the efficiency of the system. This is why it is crucial to find a healthy balance between the two.

Flow Rate

Flow rate is another thing to consider when choosing equipment. This parameter will determine the hose inside diameter, the pump head outside diameter, and the pump RPM. Needless to say, flow rate of the system is important since it has an impact on many other pieces of the puzzle.

Advantages

Again, the main advantage of peristaltic hose pumps is the fact that the pumping fluid never comes in contact with any contamination. Since it is only contacting the inside of the hose, it is fairly easy to sterilize these parts.

These pumps are also capable of handling viscous fluids/slurries and shear sensitive materials.

Lastly, there are very low maintenance costs associated with this design.

Disadvantages

Even though the hose component of this design can be a great advantage, the downside is the fact that it will eventually break down and need to be replaced due to the constant compression.

If your operation requires a continuous and smooth flow of fluid, a peristaltic hose pump is most likely not the most effective or efficient solution. They are designed to distribute a pulsed flow of fluid.

Contact ESP for a Quote Today

We covered quite a bit of information in this article to help you choose the peristaltic hose pump that is exactly right for your operation. That being said, you are not alone when making this decision. ESP is with you every step of the way. Please contact our team of experts today so we can decide the equipment and services you need!