Point of Interest: Metallurgy

Why is stainless steel so good against cavitation? If it were soft, wouldn't the imploding bubbles erode the material away in no time?

Deck: 

Is 316ss Soft or Hard?

Activation Date: 
April 22, 2003
Legacy
Legacy ID: 
14047

How Does Pump Suction Limit the Flow?

One of the claimed advantages of centrifugal pumps over positive displacement pumps is their ability to operate over a wide range of flow. Since a centrifugal pump operates at the intersection of a pump curve and a system curve, by varying the system curve the operating point of the pump easily is changed. The convenience and simplicity of such flow control by the discharge valve throttling comes at a price because a pump is forced to run either to the left or right of its best efficiency point (BEP). The flow must be limited on both sides of the BEP.

Deck: 

Suction and NPSH

Activation Date: 
April 22, 2003
Legacy
Legacy ID: 
14046

Unstable Curves

A "stable" curve is very important for a pump operation, especially for pumps operating in parallel. The higher the energy level and the more critical an installation is, the more this could become an issue.

Deck: 

Pump Performance

Activation Date: 
April 22, 2003
Legacy
Legacy ID: 
14045

Intermittent Seal Leak in LPG Pump

The following case study describes a reliability problem with a Liquified Petroleum Gas (LPG) handling pump in a field and the way it was troubleshooted and fixed.

Deck: 

Case Study

About The Author: 

Sourav Kumar Chatterjee is the manager of rotary equipment for the HPCL Plant, Mumbai, India.

Activation Date: 
April 22, 2003
Legacy
Legacy ID: 
14044

How Grease-Lubricated Bearings Function

A shielded, grease-lubricated ball bearing can be compared to a centrifugal pump having the ball-and-cage assembly as its impeller and the annulus between the stationary shield and the rotating inner race as the eye of the pump. Shielded bearings are not sealed bearings.

Deck: 

Bearings and Lubrication

Activation Date: 
April 22, 2003
Legacy
Legacy ID: 
14043

Pump Safety Guidelines

The following are general pump safety guidelines to keep in mind on the job.

Deck: 

Editorial Emphasis

Activation Date: 
April 8, 2003
Legacy
Legacy ID: 
13948

Firefighting in America

Fire departments are a relatively recent development. The first paid fire department was created in Cincinnati in 1853 (also the first year of WEM).

Deck: 

Some of the Pioneers

About The Author: 

Bill Swichtenberg is Editorial Director of WEM.

Activation Date: 
March 7, 2003
Files: 
Legacy
Legacy ID: 
13822

Heavy Duty Drainage Pumps Rescue Stormwater Flooded Quarry

Pumping around the clock at 10,000 gpm, two 94hp submersible, portable dewatering pumps manufactured by Pumpex, Inc. of Somerville, N.J., drained turbulent, overflowing stormwater to save a limestone quarry from extensive equipment damages and potential profit loss caused by severe flooding.

Activation Date: 
February 21, 2003
Legacy
Legacy ID: 
13781

Prefabricated Pumping Systems

Some engineering firms still harbor the misconception that prefabricated systems are too small to handle the enormous volumes of water that municipalities and private water companies transport. Though once limited to certain-size projects, technological innovations and manufacturing breakthroughs have dramatically expanded the application of prefabricated pump systems over the past several years.

Deck: 

Sizing Up the Possibilities

Activation Date: 
February 4, 2003
Files: 
Legacy
Legacy ID: 
13691

The Invisible Sewage Plant

If you go looking for a particular sewage treatment plant in Cincinnati, Ohio, the first thing you'll notice is--you might not notice it at all. In fact, you might drive right by the facility, dismissing it as just another office building. It just does not look like a treatment plant.

Deck: 

CSO Elimination

About The Author: 

Carl Dorsch is a mechanical design engineer, now doing freelance technical writing. He lives in Cincinnati and graduated with a BSME from the University of Toledo.

Activation Date: 
September 4, 2002
Files: 
Legacy
Legacy ID: 
13302