A metering pump is something that is commonly used in many different industries today. You may also hear them called dosing pumps. They may be used for adding chemicals into a solution or a variety or other things. In this article, we will talk more about how metering pumps work, and the different factors that determine which type is best for your operations.

Engineered Systems & Products (ESP) has over 35 years of experience in this industry. This allows us to help you choose the best option for your specific application. We team up with top notch companies like Neptune, to provide our customers with outstanding products and services. Please contact us today so that we can help you decide which metering pump is right for you!


This type of pump is designed to move a precise volume of fluid within a specified period of time. This process is referred to as metering or dosing, hence the name metering pump. In most cases, these pumps are used to distribute liquids such as chemicals and solutions. Some common industrial uses for these are water treatment plants, chemical processing plants, and many different agricultural applications just to name a few. It is important to choose a pump that is rated for the temperature, pressure, and fluids used in your applications. If you are unsure of any of this, there is no need to worry. The ESP team is here to help you make those tough decisions.

A metering pump is made up of a pump and motor. The fluid passes through the pump, which is typically driven by an electric motor. There are a few different styles of metering pumps that can be used. The one we are going to explore more extensively in this article is the piston style.

A piston driven pump is one of the more commonly used designs. This is a positive displacement style that uses a fairly straight forward piston, or plunger, process. The piston will move in and out of the chamber to create a constant flow rate against a large variety or pressures. The inlet and outlet of the pump are joined to the piston chamber with a check valve on each end. As the piston moves out, a vacuum is created which allows fluid to flow into the chamber. When the chamber is filled, the piston will begin moving back in. This pressurizes the fluid inside the chamber, which forces it to flow through the outlet check valve and out of the pump. Since the chamber is a fixed volume, the flow rate of the fluid will be determined by the how quickly the piston is moving in and out of the chamber.

Now that you have a better understand of what metering or dosing pumps are and how they mechanically operate, let’s take a closer look at a few different factors that need to be considered when choosing a pump for your operations.

Again, ESP has a team of experts that is willing and able to help walk you through the process!


This is where it is important to pay attention to details and get the experts involved. There are quite a few things to consider when deciding which type of metering pump is best for your application.

The volumes and pressures of material pumped through this equipment may vary greatly for different situations, but it must always be precise. In order for this to work effectively, very specific technology is required.  It is crucial to understand this technology when selecting the proper size and style of your metering pump.

We will touch on a few of the important things here so you can get a better idea of what to look for when making your decision.


This is one of the most important things to consider. Knowing your expected or desired flow rate is going to be a crucial step in choosing the proper equipment. A good rule of thumb is to make your maximum expected flow rate no more than 90% of the pump’s capacity. This way you will have room for small increases if needed.


Here is another one of the first variables you need to keep I mind. Where will the equipment be operating? Is the metering pump going to be outside in direct sunlight? Will it be exposed to below freezing temperatures? This may sound obvious, but it can be overlooked very easily. The operating environment will most definitely impact the performance of the pump. If the pump will be operating in cold temperatures for example, you must make sure the fluid that is being pumped will not freeze at that specific temperature.


The composition of your pumping fluid is also important when deciding on your metering pump type and size. This type of pump can be designed to handle a very wide variety of fluid viscosities, but certain things will need to be changed as the fluids get thicker or more viscous. For example, thicker ones will require the use of special fluid ends. Extremely thick liquids that contain solids may even require special diaphragms in order to operate efficiently.


Similar to the rest of your equipment involved in fluid transfer, the parts that make up these metering pumps must be able to withstand the conditions they will be exposed to. We are not referring to environmental conditions in this case, but more so the conditions created by the pumping fluid. Many industries frequently handle corrosive chemicals or abrasive materials that require more heavy duty pump components. If you are dealing with this type of fluid, you many need to explore parts made of something like stainless steel.


As you can see, the metering pump operates on a fairly simple concept, but there are many factors that influence the style and size of pump that is needed. That’s where we come in! The team of experts at Engineered Systems & Products is just a call away. We will make sure to answer all of your questions and design a metering pump system that is optimized for your specific scenario. Please contact us today so we can help you get started with your next project.