1660240840296 49d546d6742f4b379cc447357fce1efb

Pump selection: Choosing the right pump for viscous fluids

Sept. 27, 2016
Just because the pump works doesn't mean it is right.

Let’s look at pumping of viscous liquids — and limit our discussion to pumps for regular processing, not metering or sampling.

Viscosity in pumping is a great bugaboo of our business. Most pump manufacturers will tell you not to use a centrifugal pump for liquids with viscosities beyond 100 cP. And, despite what I witnessed, let’s agree that a centrifugal pump usually isn’t a good choice for viscosities above 100 cP, let alone 300 cP. Such services generally call for some type of positive displacement pump. These pumps are self-priming.

A good choice often is the lobe pump. It’s a rotary pump good up to its maximum case pressure; it can handle a maximum of perhaps 2,000 cP (which is about the viscosity of honey at 25°C).

To learn more, read "Pumps: Get Into the Thick of Things" from Chemical Processing.

Sponsored Recommendations

April 14, 2025
This paper addresses where leaks commonly occur, leak detection methods, and practical advice for an audit and repair plan. You'll learn why an ongoing leak detection and repair...
April 14, 2025
This special report explores the latest innovations in compressed air tech to help your facility reduce artificial demand and achieve greater system control. You'll also gain ...
April 14, 2025
Here are some things you can do in between formal preventive maintenance visits on your electric screw compressor to extend compressor life and prevent downtime.
April 14, 2025
They cost more than refrigerated dryers. They need more parts and service than refrigerated dryers. They increase demand for compressed air. So when should you use a desiccant...