Dual-rotor turbine flowmeter for subsea and topside applications
Bearing diagnostics and built-in redundancy suited to critical and inaccessible installations.
Exact Flow, a supplier of precision flowmeters for demanding applications, has introduced the Dual-rotor Subsea Turbine flowmeter . With a bearing diagnostic capability and wide flow range performance, the meter is a solution for subsea hydraulic pod valve actuation and topside flow applications in the offshore oil industry. In hydraulic fluid applications, it is packaged in a high-pressure, manifold-mounted system with built-in redundancy.
The company says the dual-rotor configuration offers performance not obtainable with traditional single-rotor designs. Additionally, the flowmeter offers other benefits such as bearing diagnostics, improved accuracy, pressure compensation, long-life ceramic bearings, and high-shock internals.
One element that Exact Flow says most users overlook is the peculiar characteristics of hydraulic fluids at high pressures. Normally users treat hydraulic fluids as incompressible; however, when subjected to high pressures, fluid properties vary greatly and have a substantial effect on turbine flowmeter accuracy. The Dual-rotor Subsea flowmeter is calibrated to account for the entire range of temperature and pressure conditions. It includes internal temperature and pressure sensors to correct for these effects and provide the best possible system accuracy.
Moreover, helical rotors optimize energy transfer over the entire surface of the blade, enhancing speed of response to step changes in flow rate. Helical rotors also produce less pressure drop across the flow meter, as compared with the traditional flat-bladed rotor design. The company says this reduction, translated into force, reduces bearing wear, which allows the meter to maintain its original calibration over a longer period of time.
The flowmeter family has a repeatable flow range of up to 500:1 and a turndown range of 60:1. This allows users to deploy fewer flowmeters to cover a wide range of applications. All units shipped are calibrated at Flow Dynamics, Inc., in a NVLAP accredited facility, obtaining uncertainties of &0.05% of rate and
Read more on turbine flowmeters .
—Edited by Peter Welander, process industries editor, PWelander@cfemedia.com ,
Control Engineering Process Instrumentation & Sensors Monthly
Register here to select your choice of free eNewsletters .
- Events & Awards
- Magazine Archives
- Oil & Gas Engineering
- Salary Survey
- Digital Reports
Annual Salary Survey
After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.
The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.