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WHAT IS A CHEMICAL FEED PUMP?
A guide to learn about chemical feed pumps, also known as metering pumps, at Burt Process Equipment. Peristaltic and diaphragm are two types of metering pumps.
A chemical feed pump, also known as a chemical dosing pump, is a compact positive displacement pump that injects a precise amount of chemical or other substance into water, gas or steam. It is typically part of a chemical feeder system that comprises a pump or multiple pumps, storage tank, pipes and control panel. There are different methods and types of pumps that can be used, but the general procedure is to draw a preset amount of the chemical into a holding container and then inject it into a pipe or tank that holds the water or other material to be dosed.
Basic Parts of a Chemical Pump for Dosing
Whether these are water treatment chemical feed pumps for a municipal water supply or chemical pumping used to process industrial waste water, the pumps will have certain standard components. Dosing pumps are typically small and are powered by an electric motor or air actuator.
Types of Chemical Feed Pumps
Chemical dosing pumps that are used for water treatment fall into the following categories: centrifugal pumps, piston pumps and displacement style pumps (peristaltic and diaphragm pumps). The specific application will dictate the best pump to use.
Diaphragm Pumps vs. Peristaltic Pumps
Both peristaltic and diaphragm pumps are positive displacement pumps, moving a fixed amount of fluid by trapping and forcing it into a discharge tube or pipe. However, there are important differences between the two.
A peristaltic pump, also called a squeeze tube pump, works by pushing chemicals through a flexible tube into the fluid flow stream. Unlike a diaphragm pump, they don’t use any valves or check balls, making them more suitable for chemicals that contain particulates as well as slurries, air and gasses. For delicate fluids, peristaltic pumps are preferred, since the gentle squeezing won’t cause damage. They are also self-priming.
A diaphragm pump is better for cleaner fluids. Diaphragm pumps are also recommended for high pressure and high output applications, which can both cause excessive wear on peristaltic pumps. A diaphragm pump is also better at handling high temperatures