One of the supposed advantages of centrifugal pumps when compared to positive displacement pumps is their ability to operate across a wide flow range.
In my June column on pump and motor testing, I said that three-phase voltage variation and unbalance can have a significant effect on motor insulation life. Voltage variation is defined as the difference between the motor nameplate voltage and the incoming source voltage.
In last month’s column (Pumps & Systems, May 2014), the drawdown analysis portion of the pump and motor field test spreadsheet was reviewed.
All pumps should be tested regularly, but wastewater pumps are at the top of the list because they are especially susceptible to changing system conditions.
The global water crisis claims 5,500 lives each day—more than war, natural disasters, AIDS or hunger. It is a sobering problem but not an impossible one to solve.
Centrifugal pumps have many advantages compared with positive displacement pumps. They have the ability to run all over the curve. Open the valve to increase the flow, and close it to decrease the flow. This seems convenient and simple.
The legendary innovator was responsible for the design of more than 40 patented products during his seven-decade career.
Today’s federal requirements dictate the minimum efficiency of an electric motor, but they do not have any impact on the efficiency of a centrifugal pump.
As any austenitic stainless steel would be, 316 stainless steel is very soft. So how does this stainless steel offer strong protection against cavitation? If it is soft, will the imploding bubbles erode the material?
Pumps account for 10 percent of the world’s total electricity consumption.
Recently, I received a call from a plant operator in Ohio. He said, “We have a big contract from a customer to supply multiple oil heating systems and have just completed the first unit. It is ready to ship.
One big industry focus in 2014 will be training and education. Expect Pumps & Systems to be heavily involved.
KAMP-LINTFORT, Germany (June 7, 2013) – Almatec was founded in 1984 by Dirk Budde, an industrial engineer who was working for another pump company when he decided to branch out and create his own pneumatic-pump product line.
This article was written in response to the following question from a reader:
In my opinion, the system curve is the single most important component of the pump selection process. After all, the system curve determines the operating point on a pump’s performance curve.