This is typically accomplished by reducing the size of the flowmeter — often by as many as three pipe sizes. New products from GF Piping Systems, VorTek Instruments, KROHNE, and Cole-Parmer. The electronics do not like being cooked, and a locally mounted transmitter will not last long. In line sizes of 6” or less, they are usually much cheaper than orifice plates, and they eliminate the need for impulse line heat tracing. Rule of Thumb: Vortex flowmeters are a good choice for measuring the flow rate of any reasonably clean fluid where measurement at very low flows is not required. The low flow cutoff point is determined by the viscosity of the fluid and thus may vary with fluid temperature and composition. Application Corner: Flowmeter billing errors, part 2. (If the fluid is too viscous or the flow too low, the meter will not shed any vortices at all.) It is highly unusual to select a vortex meter … However, certain limitations associated with this type of meter can make it a poor choice in some applications. His job titles have included instrument engineer, production engineer, instrumentation group leader, principal automation engineer, and unit production manager. Such units can work where others tend to fail. A. Coriolis B. Arla installed sensors at the neuralgic points in the cooling and heating system and used the measurement results to obtain a clear image of the energy consumption. Approximately how much energy is saved by operating a pump motor at 85% speed as compared to operating the pump motor at full speed to provide the same liquid flow rate? The pipe fitters tend to leave these in the box and just bolt the meter between two flanges. Beyond 6” lines the economic advantage of vortex meters falls off. He is proficient in field instrumentation sizing and selection, safety interlock design, electrical design, advanced control strategy, and numerous control system hardware and software platforms. These next few tips discuss the more common types of flowmeters and provide an insight into how they work, when they should be used, and when they should be avoided. Maintaining sufficiently high mass flowrates typically entails increasing the gas velocity. The ratio of steam flow to boiler feedwater flow is dependent upon the water treatment system and its chemistry. Be on the lookout for centering rings if the meter is a wafer type. Tim Old, VP of Aftermarket at Celeros Flow Technology, talks about the company’s ambition to be a full life-cycle partner for its customers and the challenges of launching during the COVID-19 pandemic. Specifying a thermal mass flowmeter for gases. Ultrasonic flowmeters tend to be full-bore flowmeters with no restrictions to flow, so Answer D is a candidate to exhibit the lowest pressure drop. The eddies are relatively high pressure areas that “push” the flag away and because they form on alternating sides of the pole, the flag weaves between them and flutters in the wind. In 2001, he joined Avid Solutions, Inc., as an engineering manager and lead project engineer, where he works today. Applications in cooling water, process water and steam measurement show how cutting-edge technology has improved the ability to monitor process flows. Details: Have you ever watched a flag wave in the wind? While a straight single-tube flowmeter may appear to exhibit almost no loss of pressure, pipe reductions can cause significant pressure drop. Greg is the author of numerous books on process control, including Advances in Reactor Measurement and Control and Essentials of Modern Measurements and Final Elements in the Process Industry. Case Study: Flowmeter offers solution for sanitizer production. Exceptions: While most vortex flowmeters are poorly suited for measuring liquids which tend to polymerize, some meters employ a proprietary sensor design that is not easily plugged and has a constant flow of liquid around the sensors to help keep them clean. This is called the “low flow cutoff” point of the meter, and flow rate measurement below this point is not possible. Quiz Corner: Calculating flow rate from tank level. He spends most of his time writing, teaching and leading the ISA Mentor Program he founded in 2011. If the meter is not centered, it will be inaccurate. All rights reserved. Greg was also an affiliate professor for Washington University in Saint Louis. Presently, Greg is a part time modeling and control consultant in Technology for Process Simulation for Emerson Automation Solutions specializing in the use of the virtual plant for exploring new opportunities. Insight: For high temperature applications, be sure to specify a remote mounted transmitter head. Application Corner: Flowmeter billing errors.
Rosemount 8800 Weld-end vortex flow meter Flange gaskets are eliminated by welding the flow meter directly into your process piping The only vortex flow meter available with zero potential leak points … It is usually much cheaper than an orifice meter for line sizes smaller than 6” because it does not require impulse lines nor any special freeze protection beyond that of the existing pipe. What is the flow rate when the pump operates at 80% speed?
Greg is the author of numerous books on process control, including Advances in Reactor Measurement and Control and Essentials of Modern Measurements and Final Elements in the Process Industry. The vortex shedding bar (bluff body) across the meter is great for catching bolts, drink cans, oyster shells, and all kinds of other debris wandering down the line. Additional Complicating Factors Full-bore thermal flowmeters can exhibit almost the same (low) pressure drop as full-bore ultrasonic flowmeters. Vortex flowmeters require turbulent flow to operate and will cease to read as the fluid transitions from the turbulent flow regime to the transitional or laminar flow regime. It generally has a lower pressure drop than an orifice meter. For example, many ventilation ducts operate at a pressure of only a few millimeters of water column. All rights reserved. Target and vortex shedding flowmeters both contain restrictions to flow so Answers B and E are not correct. What is the approximate flow rate into a circular 1,000-gallon vertical tank that is filled in 10 minutes?
The vortex flow meter is ideal … He can be reached at 845 623-1830. www.spitzerandboyes.com, Sign up for Flow Control Network eNewsletters. Here is a quick list of the pros and cons of this type of meter: Watch-Outs: The low flow cutoff is the chief limitation of a vortex flowmeter, and it makes the meter unsuitable for any application where measuring low flows at high turndown is required. Coriolis mass flowmeters (Answer A) are available with straight single-tube designs that are full-bore flowmeters and do not restrict flow.
Product Focus: Ultrasonic Flowmeters & Piping. There are many important factors to consider when selecting and sizing restriction orifices. When material gets caught on the body, the meter will either read inaccurately or not at all. Small sensors in (or behind) the bar detect the vortices and count them. Target C. Thermal D. Ultrasonic E. Vortex shedding Commentary Flowmeters that restrict the flow typically tend to exhibit more pressure drop than those that do not restrict flow. Complacency and stagnation. Vortex meters are known to be superior devices for steam flow measurement due to their inherent linear measurement, large turndown, low pressure drop, and high accuracy. Greg has been the monthly "Control Talk" columnist for Control magazine since 2002. The organization develops widely-used global standards; certifies industry professionals; provides education and training; publishes books and technical articles; hosts conferences and exhibits; and provides networking and career development programs for its 40,000 members and 400,000 customers around the world. Target and vortex shedding flowmeters both contain restrictions to flow so Answers B and E are not correct. Highly viscous fluids cannot be measured with a vortex meter. Application Corner: Uncovering the unknowns: Flowmeters, Product Focus: Flow measurement and panel meters, Application Corner: Flowmeter billing errors, part 4, Arla Foods analyzes energy consumption using flow sensors. Presently, Greg is a part time modeling and control consultant in Technology for Process Simulation for Emerson Automation Solutions specializing in the use of the digital twin for exploring new opportunities. This is called the “low flow cutoff” point of the meter, and flow rate measurement … High vibration or entrained solids can be problematic for vortex meters, which may detect and count solid particles or vibrations as if they are actually flow.
Vortex flowmeters require turbulent flow to operate and will cease to read as the fluid transitions from the turbulent flow regime to the transitional or laminar flow regime. Two words that will crush any marketing team—not to mention a business—faster... Benefits and Shortcomings of Vortex Flowmeters. Dealing with challenging flow measurements.
© 2020 Endeavor Business Media, LLC. David W. Spitzer, P.E. Like an orifice meter, the vortex meter requires an upstream and downstream meter run to establish a good flow profile. The flowmeter converts the meter count into a fluid velocity and determines a volumetric flow rate by multiplying the fluid velocity by the cross sectional area of the meter. Vortex flowmeters make effective (if unintended) start-up strainers. Using this analysis, one might conclude that Coriolis mass flowmeters also exhibit the lowest pressure drop. This run should be no less than 15 diameters upstream and 5 diameters downstream, but most vendors like to see at least 25 diameters upstream and 10 diameters downstream. For example, many ventilation ducts operate at a pressure of only a few, Many processes can tolerate only a small pressure drop across a flowmeter. ISA advances technical competence by connecting the automation community to achieve operational excellence. Greg has been the monthly "Control Talk" columnist for Control magazine since 2002. Electrical Engineers in Automation: What Are the Success Stories? Gregory K. McMillan, CAP, is a retired Senior Fellow from Solutia/Monsanto where he worked in engineering technology on process control improvement. Every instrument is well suited for some applications and perfectly awful for others.
Greg is an ISA Fellow and received the ISA Kermit Fischer Environmental Award for pH control in 1991, the Control magazine Engineer of the Year award for the process industry in 1994, was inducted into the Control magazine Process Automation Hall of Fame in 2001, was honored by InTech magazine in 2003 as one of the most influential innovators in automation, and received the ISA Life Achievement Award in 2010. The pressure drop across the probe(s) in generally small, but it will be larger than that of a full-bore ultrasonic flowmeter with no restrictions. A: Excessive pressure drop is rarely an issue; only for certain very specific process fluid conditions (e.g., marginal flashing or degassing service). In order to operate accurately, Coriolis mass flowmeters should not be operated at relatively low mass flowrates.
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