48 Flow Level Pressure
How to Specify the Best Flowmeter for your Application
Titan Enterprises reports on a white paper written to assist design engineers looking to specify the best liquid flowmeter for their application.
Choosing the best flowmeter for your application can be a daunting task as the optimal specification can vary considerably according to a wide range of operational parameters including pipe bore, flow path, liquid viscosity, particulate levels, measurement accuracy, measurement dynamic range, maintenance required and target purchase price.
Drawing upon over 40 years of designing and supplying liquid flowmeters to meet stringent specifications – the engineering team at Titan Enterprises produced an informative and unbiased white paper that discusses the benefits, limitations and ease of applying different flowmeter technologies (differential pressure, turbine, propeller, positive displacement, vortex, ultrasonic, electromagnetic and mass flow measurement) to metering liquid flows. In addition the paper discusses the many elements that make up cost of ownership over and above the flowmeter purchase price that a design engineer should consider when specifying the best system for their application.
To assist the specification process the paper includes an easy-to-use selection guide that takes 13 different application examples and charts them against 14 different types of flowmeter, highlighting the good, the bad, and the questionable techniques for each application.
Need an Innovative Solution to Knock out your Level Control Problems?
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Magnetrol® punch. Eclipse®
offers best-in-class radar instrumentation that packs a powerful 706 Guided Wave Radar and Pulsar® Model R96 Non–Contact
Radar transmitters provide measurement performance that far exceeds traditional level control technologies. From very light hydrocarbons to water–based media, MAGNETROL radar instrumentation is versatile enough to handle a wide range of processing applications. Radar technology has revolutionised level measurement in a variety of process industries since the introduction of 4-20mA loop powered, radar-based transmitters in the 1990s.
Both guided wave radar (GWR) and non-contact radar have numerous advantages over older, more established level measurement technologies. Both guided wave radar and non-contact radar have the same general principle of operation (microwave time of flight) and no moving parts. Because of this, users can retrofit these radar transmitters into various process applications and see improvement in efficiency and accuracy, including applications that use these technologies: DPs, due to SG shifts, installation cost, and leak points; Buoyancy, due to SG shifts, moving parts, calibration issues, and cost; RF Capacitance, due to cumbersome calibration, dielectric shifts, and coating issues; and Ultrasonics, due to vapour effects, turbulence, and foam.
Guided wave radar and non-contact radar are related technologies, and together they are a powerful combination that can cover the majority of your continuous level control needs. A very similar user interface and quick disconnect electronics means that, if you know how to use one, you’ll know how to use the other.
Variable Area Flowmeter Offers Extended
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Options for Oil and Gas Applications KROHNE has extended the available options for the H250 M40 flowmeter in order to match the requirements of the oil and gas industry. Here, variable area flowmeters are widely used for flow measurement on injection skids for corrosion-, scale- and hydrate- inhibitors like Methanol or Monoethylene Glycol. Common areas of application are also measuring agents and solvents in gas treatment processes like sweetening and dehydration of natural gas as well as reliably monitoring small amounts of Nitrogen and Fuel gas.
Standard materials for the range of DN15…150 / ½…6” flanged process meters include NACE MR0175/MR0103 compliant 316L or materials and welding following the NORSOK standard. Hastelloy, Monel, 6Mo, Titanium and now also Inconel are available as optional materials to provide high corrosion resistance to any kind of fluid. Stainless steel indicator housings and offshore protective coatings can be applied on request.
Flange connections reach up to ASME B16.5 Class 2500 flanges. Even higher pressure ratings can be realised when applying API flanges. For hazardous gas and dust areas, H250 M40 has achieved more than 30 approvals worldwide, including ATEX, IECEx, usFMc, NEPSI, INMETRO, KGS, EAC and PESO/CCOE. For quality assurance, comprehensive tests and certifications are in place such as positive material identification, material mill certificates, x-ray and dye-penetration examination of the welding seams, pressure and leakage tests, and finally third party factory inspection.
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40618pr@reply-direct.com ANNUAL BUYERS GUIDE 2017 •
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New Digital Remote Sensor and Differential Pressure Transmitter Released
Yokogawa Electric Corporation (the Netherlands) today announced the release for sale in Europe of the EJXC40A digital remote sensor, a newly developed DPharp EJX series differential pressure transmitter. Equipped with two pressure sensors that are connected with an electric cable, the EJXC40A offers superior performance in the measurement of liquid levels in large tanks and large differential pressure with high- pressure fluids. This new addition to the DPharp EJX series will meet a wide range of customer needs.
Differential pressure/pressure transmitters are widely used in the oil, petrochemical, and chemical industries in applications such as oil and gas wells. By measuring the difference in pressure at two points in a tank or pipe, these transmitters can calculate the level, flowrate, and density of liquids, gases, and steam. In applications where a tank liquid or gas or a pipe fluid cannot be introduced into the pressure-receiving unit (diaphragm) of a transmitter, diaphragm-sealed differential pressure transmitters are used.
A transmitter of this type is connected to two separate pressure- receiving units by a capillary tube that is filled with silicone oil or some other fluid. Although such transmitters are capable of precisely measuring high-pressure fluids with a high resolution, they are not suitable for use with large tanks because of limitations in the allowable length of the capillary tubes. In addition, they are not ideal for fine differential pressure measurement because the fluids in the capillary tubes are susceptible to changes in the ambient temperature.
The EJXC40A consists of two separate pressure sensors that are connected to each other by an electric cable. Based on the difference in pressures measured by each sensor, the EJXC40A determines the liquid level, flow rate, and pressure of liquids, gases, and steam. The EJXC40A is ideal for the following applications.
The electric cable connecting the two pressure sensors can be up to 45 meters in length, enabling the measurement of liquid levels with very large tanks and tall distillation columns.
Since the two pressure sensors are connected only by an electric cable, their measurements are not influenced by changes in the ambient temperature. There is no need to correct for changes in temperature when performing fine differential pressure measurements with gas tanks and other applications. This ensures stable measurements.
As the two pressure sensors can be set to measure different pressure ranges, the EJXC40A digital remote sensor can measure high differential pressures of up to 70 MPa, something that is difficult to do with a single sensor unit.
According to Yoji Saito, head of the Product Business Center in the Industrial Automation Platform Business Headquarters: “The DPharp differential pressure/pressure transmitter is a core product in Yokogawa’s field instrument line-up. Compact in size and suitable for use in a wide range of applications, over 6.5 million units of these instruments have been sold since its release in 1991. According to a Yokogawa survey, we have the second largest share of this market. Equipped with a silicon resonant sensor that uses Yokogawa’s proprietary DPharp technology, the EJXC40A delivers the high accuracy and stability needed in the petrochemical, chemical, power, oil & gas upstream, and LNG markets that Yokogawa is targeting. Yokogawa will continue developing products to satisfy its customers’ needs and expand its field device business.”
Yokogawa’s DPharp differential pressure/pressure transmitters are designed for use in process manufacturing industries including oil and natural gas, petrochemicals, chemicals, and power. They are used to measure pressure, liquid level, and flow rate of liquid, gas, and steam.
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