Flowmeters get around

The lowly flowmeter ends up in some of the most interesting places. CONTROL contributor and flow expert David W. Spitzer shares some odd and interesting flow measurement applications.

By David W. Spitzer

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By David W. Spitzer, CONTROL Contributor

Enwave EnergyAccording to the number crunchers at Flow Research, the value of the flowmeters sold worldwide last year runs well into the hundreds of millions of dollars. That’s a lot of flowmeters. Most show up in the usual places—water and wastewater facilities, oil and gas operations, and batch processing facilities. However, not every flowmeter is destined for such prosaic applications. Some end up in underground lakes or inside cement mixers. The really lucky ones get to go to the ski slopes or major amusement parks.

Flow measurement devices can be used in many creative and novel ways. When I worked at Nepera Inc., Harriman, N.Y., an existing sump pump discharge flowmeter exhibited the seemingly undesirable characteristic of being susceptible to vibration. My interest in flowmeters prompted me to suggest that this flowmeter be evaluated, and replaced if its measurement was deemed useful. However, my astute instrument foreman noticed that flow measurement noise was reduced after sump pump replacement. With the noise as a guide, subsequently, this flowmeter was used to detect when the sump pump needed to be repaired or replaced. Needless to say, the existing flowmeter was left “as is.” Imagine that—using a flowmeter to monitor motor health!

Not only can flowmeter applications be weird, but they  also can appear in many out-of-the-ordinary places, including those cement mixers, amusement parks and underneath Lake Ontario.

The Meter in the Lake
Imagine monitoring and controlling the flow from a hidden lake that’s almost 100 meters below Lake Ontario. Enwave Energy in Toronto operates the Deep Lake Water Cooling (DLWC) system, which uses water from the underground lake to provide cooling to approximately 100 buildings in downtown Toronto.


  Enwave Energy

Flowmeters such as this one are used by Enwave Energy, Toronto, to help calculate energy consumption and provide real-time diagnostic information. (Photo courtesy of Enwave Energy.)

Stephen Perkins, vice president of engineering, explains, “Heat exchangers transfer cold energy from the lake water to the separate closed water loop that distributes cooling energy to our customers. The water is then fed into the city’s potable water system to avoid the potential negative impact of returning the warmed water into the lake.”

“Enrave calculates its customers’ bills based on the energy consumed,” adds Joe Incontri, sales and marketing director for flow and level measuring instrument maker Krohne. “Measurements of flow and inlet and outlet temperature are used to calculate energy consumption. The flow measurement is implemented using our magnetic flowmeters, which also are networked over telephone lines to provide real-time flow information that can help diagnose operational problems.”


Water intake pipes for the DWLC are being towed into place in Lake Ontario. (Photo courtesy of Enwave Energy.)


Overall, Perkins is pleased with the short delivery times and the accuracy of the magnetic flowmeters. “The worst thing would be to start having an argument about the bills, and that’s why we’re so fussy about the quality of the flowmeters that we use,” adds Perkins. “The environmental benefits are quite dramatic because the DLWC consumes only one-tenth of the electricity compared to conventional chillers, and eliminates approximately 61 megawatts of demand from Ontario’s electrical system. This process removes the introduction of approximately 80,000 tons of carbon monoxide into the air annually, and eliminates the use of large quantities of ozone-depleting refrigerants. In addition, this cooling process eliminates noise, vibration and the allocation of space for refrigeration equipment.”

The Cement Mixer
You know those big, slow-moving concrete trucks you inevitably get stuck behind on a two-lane highway? There’s a lot going on inside that behemoth while you’re trying to figure out a way to pass it. It might even have a system from Universal Flow Monitors that automates the batch water additions and the water used to wash the chute after the concrete is dispensed.

Erik Rosaen, Universal’s vice president, explains that the system “uses a single vortex-shedding flowmeter for both the water addition and washout. The satellite navigation system can then forward this information to monitor cement quality by allowing dispatchers to monitor, record and check the amount of water added to the cement. Monitoring washout flow allows the truck to be redeployed immediately after the chute is cleaned.”

Hitting the Slopes
Flowmeters can also make skiing more enjoyable, while maintaining efficiency and improving safety. Anthony DiCarlo, a GE Sensing application engineer, recalls “a number of applications where the amount of snow made on the mountain is measured. The amount of snow made can be compared with the amount of nitrogen consumed to ensure that the snow-making machine is operating efficiently and economically.”

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