40 Flow Level Pressure Field-Proven Performance Verified on the CEESI Wet-Flow Test Rig


FLEXIM (Germany) is aware of the challenges its customers are facing, especially in terms of wet gas. With its recent tests at CEESI’s Wet Gas Testing and Research Facility (WGTF) in Colorado, USA, FLEXIM’s intention was to determine the maximum liquid load tolerated by the ultrasonic meter and to specify the measurement error related to it. FLEXIM’s FLUXUS®


G gas flow meters work according to the transit-time difference


principle (time of flight). As the transducers are clamped onto the outside of the pipe, they do not come into contact with the medium flowing inside and therefore, remain dry. Compared to DP devices, the acoustic method offers accurate and reliable measurement over an almost unlimited flow range, regardless of the flow direction.


The FLUXUS® G ultrasonic flowmeter was capable of measuring throughout the whole test range up to a liquid volume fraction (LVF) of 5%,


corresponding to the Lockhart-Martinelli parameter XLM=0.3. The gas is called wet gas up to XLM=0.3 and it is considered to be a two-phase flow above XLM=0.3.


Almost all academic experiments are one thing, but the often harsh conditions in the field are another. As FLUXUS® G stands its ground in the


industrial world and FLEXIM enjoys a good reputation as a reliable partner, major gas companies are going one step further by conducting their own wet gas tests in the field. In such test measurements on a production platform in the North Sea, it was shown that non-invasive ultrasonic flow measurement is practically unaffected by the noise of valves or compressors.


Reader Reply Card No 118


Enhanced Air and Gas Mass Flow Meter Released


Magnetrol International (Belgium) is pleased to announce the release of the Thermatel®


Enhanced Model TA2, air and gas mass flow meter.


At a first glance the enhanced model looks identical to the original design but it’s much more. All standard input voltages (AC and DC) are accepted and the rotatable housing allows positioning of the display to the customer’s liking.


The display, two lines with sixteen characters each, is now backlit; this allows easy reading in bad weather conditions or dark environments. The four push-button keypad facilitates easy configuration allowing the customer to make modifications in the field.


The Enhanced Model TA2 can be calibrated for one or two different gasses or two completely different ranges, thus also increasing turndown ratio or providing more flexibility.


By updating the sensors and sensor design, higher velocities can be measured, and a faster response to changing conditions is obtained. In addition, the new design reduces blockage of flow through the window and reduces orientation sensitivity.


The new


ST100 Series Gas Flow Meter.


So perfect, it’s like you designed it yourself.


Inspired design. Inspiring performance.


Informative, graphical LCD readout, interchangeable analog and digital bus communications, flow rate, total flow, temperature, pressure, highest integrity enclosure, dual sensor systems, calibration options, easy and accurate installation.


The ST100, your process gas flow meter wish list turned into reality.


There is also a second optional mA output for temperature or flow. Using HART® and


PACTware™ is strongly advised as it is helpful for trending, changing any configuration and use for diagnostic purposes. While this is a SIL 1 device the Enhanced Model TA2 has a Safe Failure Fraction (SFF) of 88.4%.


Reader Reply Card No 119


Flowmeter Calibration Without the Need for Intermediate Turbine Meters


Independent tests carried out in the Middle East have consistently demonstrated that Rheonik Coriolis large size flowmeters from GE’s Measurement & Control Solutions (USA), can now be calibrated on compact provers without the need for intermediate turbine meters to validate use for custody transfer.


Pipe provers have been used in the oil and gas industry for many years to prove meters to custody transfer and fiscal standards. Over the past twenty years, small volume or compact provers have proved a viable alternative but experience has shown that certain types of meter do not calibrate well because of the small volumes used in compact provers.


Coriolis meters have been particularly difficult to prove using this equipment because Coriolis meters, which measure mass flow, use a sampling and calculation system which integrates data over a short period and produces an output that lags behind the actual flow at any point in time.


If this integration period is not compatible with the time taken for the piston of a small volume prover to complete its pass between detectors, then errors will occur.


Historically, one way around this problem has been to first prove a turbine meter over the required flow range and then use this proven meter as the transfer standard for the Coriolis meter.


The latest tests have been carried out using only a compact prover, an OMNI flow computer and a density meter. The configuration involved setting up the flow computer to accept the density measurement at the flow meter outlet connection.


Visit FluidComponents.com/ST100 today for a self-toured demo


1-800-854-1993 1-760-744-6950 Reader Reply Card No 120 August / September 2011 • www.petro-online.com The verified results show an average stable meter factor and a repeatability of less than +/- 0.1% and the flowmeters proven ranged go up to 12”.


As Uwe Hettrich, product manager for GE’s Rheonik product line, explains, “The Rheonik Omega tube Coriolis meter is one of the most versatile meters on the market. It offers very high accuracy and fast response. It is unaffected by viscosity, density or pressure changes, it can be used in extremely wide range of line sizes, pressures and temperatures and has hazardous area approvals covering most of the world. Its ability to be calibrated by a compact prover, without the need for an intermediate turbine meter, further extends its versatility.”


Reader Reply Card No 121


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