Pumps & Systems, August 2007

When we start the pump selection process for a particular application, one of our major concerns is efficiency. If several different models of similar quality meet our conditions, we will usually select the one with the highest efficiency. After all, higher efficiency reduces the cost of electrical power. There are times, however, when efficiency can take a backseat to the true, overall cost of operation.

Pumps & Systems, August 2007

How many gallons per minute are REALLY flowing out of that pump?

Perhaps the OEM pump manufacturer tested this pump at the factory - or perhaps not. You now have a pump, or perhaps it has been there for some time, and you suspect that it is no longer pushing the flow as it once did or is supposed to. The problem is there is no inline metering device to monitor the actual number of gallons. What can you do?

Pumps & Systems, August 2007

Conclusion of our look at a new tool that predicts how pumps and systems interact.

Pumps & Systems, August 2007

Even when a redundant pumping system is in place, it can be advisable to monitor the condition of the operating units in critical applications where maintaining production depends on motor-pump reliability.

Pumps & Systems, August 2007

Last month, "carbon/graphite fiber" braided packings were shown to be effective solutions to many common sealing applications. But the questions remain: Are there packing materials that can more effectively seal at high temperatures? If so, do they require blocking agents?

Pumps & Systems, August 2007

Q. Is there a way of predicting the maximum operating speed for a reciprocating plunger pump when pumping a viscous liquid?

Pumps & Systems, July and August 2007 

A review of traditional metering pump designs, along with a look at some of the new technologies that are being introduced.

Pumps & Systems, August 2007

With the wide use of variable frequency drives in the pump industry and increasing unit size, it is becoming more difficult to design mechanical systems free from natural frequencies within operating speed range. If such an occurrence is allowed in the field, a resulting resonance condition threatens to significantly impact performance and longevity of the equipment.

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.