March 2007 Issue

Many pipeline systems throughout the U.S. are in need of maintenance, but this maintenance is often pushed back because there is no way to properly shut down the system.
Have you ever wondered why a motor manufacturer would state that many of their 60-Hz motors will operate on 50-Hz power as long as you reduce the nameplate voltage by 1/6?
Good suction piping design must eliminate air entrainment in the liquid, minimize friction loss, provide straight and uniform flow at the pump inlet and avoid excessive forces due to pipe strains at the pump.
"How long will I be able to run my equipment before it has to be taken down for servicing?" is a question often asked when a buyer or user decides to purchase a new pump, agitator, or other type of rotating equipment.
Identifying the source of vibration by following the amplitude: the case of a company that thought the problem was a pump impeller, but, in fact, the problem was over 15-ft away and not a pump at all.
What's hot and what's not with pumps in the water/wastewater industry.
Vibration monitoring of rotating equipment and analysis of the resulting data are effective ways to evaluate the health of production machinery in order to achieve best maintenance practices, extend equipment longevity, and avoid unplanned shutdowns. Plant equipment seldom fails without giving signals well in advance, so breakdowns can normally be predicted by listening for the warnings and passing that knowledge on to those in a position to prevent such problems.
Industry analysts predict that in the near future, most motors will be controlled by variable frequency drives. Here are the reasons why.
A sewage lift pump that pumps millions of gallons per day simply can't go down. To prevent this from happening, this pair of electricians went about testing some new electrical systems for those pumps with a new insulation multimeter.
Over the past 50 years, advances in technology have provided the primary thrust behind the success and evolution of variable-speed drive systems. Here are some considerations for the proper selection and set up of different types of systems, and what lies ahead in the future.

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