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Pumps & Systems, October 2008

The Telltale Signs of Cavitation

In water distribution systems where high pressure differentials and high flow rates are present, valves, piping and equipment really take a beating. When automatic control valves are exposed to such conditions, they will often exhibit vibration and excessive noise, letting the operator know that the pressure differentials and high flow rates are taking their toll. When these "symptoms" appear, they are clear indications that cavitation is occurring and will be followed by diminished performance and failure.

Pumps & Systems, March 2007

In a metal finishing facility, wastewater management is critical. Often, seemingly small issues can shut down the entire cycle. Now on its third generation of pumps, this metal finisher has finally found a solution to its wastewater treatment issues.

Pumps & Systems, March 2007

This primer presents basic surge control principles and the functions of various valves associated with pumping stations.

Pumps & Systems, March 2007

Properly choosing an elastomer seat for a butterfly valve requires taking time to carefully determine the application parameters. Here are the primary considerations involved in selecting a seat.

Pumps & Systems, September 2008

Have you ever looked at a valve, sluice or similar rotating equipment and wondered how to operate it?

Pumps & Systems, September 2008

Valves used in flotation cells, dewatering service, cyclone separators and tailing applications tend to wear out quickly, so mining companies spend thousands of dollars replacing expensive valves and parts. One solution to this dilemma is elastomer-lined valves, including pinch valves and slurry knife gate valves.

Pumps & Systems, September 2008

Last month, we used a hypothetical example to illustrate the onset and effects of water hammer. This month we will investigate its major causes and gain an even better perspective on the variables that contribute to its intensity.

Buying complex products and services can be just that . . . complex. Engineers like David Griffiths at New York Air Brake need to design and assemble solutions that perform under great pressure, with no room for error or downtime. Griffiths' job is to find simple, elegant solutions to complex problems in the well-established rail industry. He expects the same from his suppliers.

Pumps & Systems, August 2007

Editor's Note: Due to the high number of responses from our readers for more information regarding valve applications in "Surge Control in Pumping Stations" (Pumps & Systems, March 2007), this article serves as a follow-up to that discussion.

Pumps & Systems, March 2008

Whether you are a multinational OEM or a mom-and-pop shop, pump systems are expensive and need to be protected. The protection system for the pump is a vital piece of the system and often can make or break a company financially. If a refinery on the Gulf Coast loses a pump or two, the company could lose millions. If a pump on the heating system of a store in the Maine North Woods fails, the pipes may freeze and the building could suffer serious damage.

Pump operators and pump manufacturers must understand the best practices for protection and return on investment. This article examines some of these protection systems and describes the best way to install them.