John Callison & Michael Charnholm
undefinedAshley Valley Water & Sewer Improvement District (AVWSID) serves rural county residents who live outside the City of Vernal, Utah. The water district supports a growing population of 10,000 people, as well as local ranchers and farmers who raise livestock, alfalfa, hay, various grains and feed corn.
The district’s water supply is derived from a year-round active spring additionally fed by mountain snowmelt. Seasonal and weather variations can affect the output of this vital resource, which the district shares with several other water entities. Accurate tracking of water use for allocation and conservation purposes is therefore extremely important for AVWSID.
The district’s drinking water plant is an up-flow clarifier that, according to its water allocation, can process 8 mgd of raw water.
If the plant exceeds its water share allocation, the district would be forced to purchase water at a more expensive rate, which affects operational costs and customer rates.
“We installed the McCrometer FPI Mag flowmeter in our raw water line where it comes into our treatment plant,” said Ryan Goodrich, assistant manager, AVWSID. “Accurate entry point of measurement is critical for us so we know how much water we treat, use internally and supply each day. We compare the daily flow data to our actual water right share. The FPI Mag meter is performing very well in normal operations, including high flow cycles, such as when we flush the plant’s filters. The immediate benefit of the FPI meter is its accuracy and reliability over the full range of flow rates required by our plant’s operations.”
The Problem
With the need to replace an existing flowmeter for improved performance, the AVWSID plant operations team was looking for a reliable flow measurement solution that would be easy to install without impacting operations. They wanted to minimize operational interruptions and avoid the need for extra personnel to bring the flowmeter into service. For this pilot plant application, they were looking for a high-performance, easy-to- install, economical flowmeter with minimal maintenance requirements.
The Solution
The district staff contacted the applications team at McCrometer, who recommended the FPI Mag flowmeter due to its consistent, highly accurate performance, easy hot-tap installation, low maintenance and versatility.
The installation process at the point of entry to the plant was simple: The 18-in. main line pipe was tapped and an FPI Mag meter with a saddle mount and transmitter was installed. Since the previous meter had already been wired, it was easy to connect the transmitter.
“We deal with many different types of meters and applications where the meter display needs to be calibrated, which takes extra time and can be confusing,” said Goodrich. “I’m pleased that we could install the FPI Mag so quickly, and the display right away made it easy to see it was working.”
According to Goodrich, adding the meter to the plant SCADA system was simple.
“The instructions were clear,” he said. “As soon as the connection was made, the meter showed up immediately on the SCADA system.”
The district staff made a few adjustments to its SCADA program and the meter was fully operational within the system. With no programming necessary, there was no need to hire a programmer and spend extra money to bring the meter online.
“That extra cost for programming can be a real problem in some cases and will actually prevent us from using some meters,” Goodrich said.
The FPI Mag meter has been installed at the plant for about seven months with no maintenance needs.
“The meter design appears to be as if there will be no issues and it is simple to pull and clean when necessary,” Goodrich said.
Goodrich noted there was a burst pipe incident at the plant, which soaked the instruments and automation equipment. The staff had to turn off the power to fix the problem. When the power was turned back on, the FPI Mag meter and its transmitter came right back online without the staff needing to reset parameters or make additional adjustments.
The FPI Mag flowmeter installed in the water treatment plant.
The Technology
With AVWSID’s critical need for accurate measurement to ensure compliance with its water right share, the FPI Mag flowmeter’s next generation design supported this requirement. The meter’s advanced sensor features multiple coils and electrodes assembled in a tube that inserts completely into the pipe to measure the full profile of the flow stream, providing exceptional accuracy even in challenging flow conditions.
The meter’s signal converter features an advanced filtering algorithm to support accuracy of ±0.5% of reading from 1 to 32 ft/second and ±1% from 0.3 to 1 ft/second. The signal converter also includes built-in dual 4-20mA outputs for communication flexibility, additional programmable outputs to support SCADA systems and a simplified menu structure for ease of use. These features made it easy for AVWSID to connect the meter to its SCADA system without the need for programming assistance from outside contractors.
The FPI Mag flowmeter's multiple coils.
Conclusions
AVWSID is pleased with the accuracy and performance of the FPI Mag meter.
“The flowmeter has performed as well as advertised and the install process was as easy as we were told,” Goodrich said. “We have been very impressed with the whole process, from ordering to installation.”
Based on the successful results of the FPI Mag in the pilot plant application, AVWSID is considering the purchase of more FPI Mag meters for a new treatment facility that is currently being designed and built.
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“I hope to use the FPI Mag meters in the new facility because of its accuracy, ease of installation and integration with our SCADA system,” Goodrich said.
