Because cavitation is unavoidable in pump operations, understanding how to reduce it using NPSH calculations is necessary to maintain pump functionality and health.
Higher temperatures reduce water’s lubricating effect and stress seal faces.
My last two columns (Pumps & Systems, April and May 2014) explained how pump suction behavior depends on how suction pressure is reduced. The original video, which showed two suction pressure tests,...
This material stands up to pump upsets such as cavitation and dry running.
Q. What are the best materials to use in pump construction to minimize part corrosion? A. Factors to consider in the selection of materials for wetted pump components include user's experience,...
Drops in pressure and shifting flow rates were significant hurdles of a $403 million water project.
Part 3 Editor's Note: While running a pump at its best efficiency point saves money, reduces downtime and improves performance, many plant managers are unaware of how their equipment is actually...
These pumps prevent equipment from corroding, provide lower costs and increase efficiency.
Lev Nelik answers a reader's question on thermodynamic sub-processes that are highly time dependent
Set in the foothills of Canada’s Rocky Mountains is the city of Airdrie. Without a water supply, Airdrie purchases its water from neighboring Calgary. Every night, Calgary pumps enough water to fill...
Read the first part of this article here. Incorrect piping can result in hydraulic instability and cavitation in a pump system, among other problems. To prevent cavitation, the focus should be...
This article will discuss a case of how measuring vibration can help detect cavitation issues. It will also show how this can relate to a bigger problem at the plant. Sometimes a proposed change of...
Is Your Pump Mounted Internal Relief Valve Talking Back?
A brand new internal gear pump is started up and the flow delivery is 30 percent to 40 percent below rated capacity, and the pump is making a loud chattering noise.What could be the problem?A likely...
Pump Vibration Monitoring Basics
Knowing the application's demands and the sensor's capabilities is critical for accelerometer selection.Vibration monitoring of critical and auxiliary pumping systems helps improve machine...
Reverse Engineering--an Alternative to Traditional Pump Repair
With reverse engineering, a pump service facility increased the performance of a service water pump in a nuclear power plant.When an East Coast nuclear plant wanted to increase the performance of its...
First of Two Parts Cavitation can severely damage pumps and is affected by pump design and system issues. What affects it most? Does the suction behavior from the discharge side (system) of a pump...
Summer Pump Quiz—Cavitation
Let’s start with the basics: boiling is the vaporization of liquid. In a kitchen, water boils at high temperature—100 C (212 F). These temperatures are at atmospheric pressure, however.Liquid can...
One of the supposed advantages of centrifugal pumps when compared to positive displacement pumps is their ability to operate across a wide flow range. Because a centrifugal pump operates at the...