Flow Level Pressure


within a wide 0.25 to 1000 SFPS [0,07 to 305 NMPS] flow range This meter further provided ±1.75% of reading, ±0.5% full scale accuracy, with 0.5% of reading repeatability, which collectively met or exceeded all of their measurement performance objectives.


The MT100 transmitter’s local readout provided the refinery plant team with a state-of-the-art, color LCD display. It continuously shows the flow rate in actual engineering units, as a percentage of its range and in a trend graph whose time base is user selectable. The comprehensive readout also continuously displays totalized flow, intake air temperature and the operational status of each flow sensor in the system.


The MT100 transmitter’s standard analog outputs include dual (2), high resolution, 16 bit 4-20mA, compliant with NAMUR NE43, and a 0-1kHz frequency/pulse. Standard digital bus communications include HART (Fieldcomm Group™ certified) and Modbus 485. A USB port for interface to PC’s is also included. Optional bus communications available are Foundation Fieldbus and Profibus-PA.


Fig 2. Combustion Pre-Heater Air for Boilers


are difficult for ordinary flow meters because of distorted flow profiles and lack of straight-run that result in inaccurate and non- repeatable flow measurements.


The diameter of the MT100’s meter’s multiple flow elements was small enough to fit between the silencers and their adjustable insertion length allowed their measuring point to be set on site to optimize the repeatability and reliability of the air measurement. Furthermore, because the MT100’s thermal flow elements have no orifices or moving parts to clog or foul, the cost and time of routine maintenance could be significantly reduced.


To ensure accuracy in large diameter ducts, stacks and pipes, the MT100 flow meters can be supplied with up to eight flow rate sensors. The multiple sensors are inserted at various depths within a duct, pipe or stack and their outputs are multiplexed and averaged to calculate the flow rate with high accuracy in the process line. They can be installed at multiple points around the process line as an array of single tap points or mounted across a mast.


The engineering staff at the refinery also was pleased to learn that the standard MT100 meter offers: a large 100:1 turndown


The meter’s electronics include a user programmable data logger feature to which flow rate, temperature and totalized flow, as well as fault codes, can be recorded on a removable, 8GB microSD card. The instrument also features a 3-point precision calibration drift check, which can be initiated on user demand or programmed to run automatically.


For stack and flue gas environmental monitoring applications, the MT100 multipoint meters are available with an optional Continuous Emissions Monitoring System (CEMS/CERMS) package which adds special calibration checking routines compliant with U.S. Environmental Protection Agency’s (EPA) requirements.


Thermal Dispersion Flow Sensing


The MT100 flow meter is designed with thermal dispersion sensing technology, which provides direct mass flow measurement. This technology places two thermowell protected platinum RTD temperature sensors in the process stream. One RTD is heated while the other senses the actual process temperature. The temperature difference between these sensors generates a voltage output, which is proportional to the media cooling affect and can be used to measure the gas mass flow rate (Fig 3) without the need for additional pressure or temperature transmitters.


With this direct mass flow sensor technology, the multipoint thermal meter selected by the refinery plant team also includes


53


Fig 3.Thermal DIspersion Mass Flow Sensing Theory of Operation


built-in real-time temperature compensation. This capability ensures repeatable and reliable measurement even in applications where wide process temperature variations are present, such as large refineries in continuous operation throughout the year.


With no moving parts or orifices to plug or foul, the multipoint thermal mass flow meter was immune to dust and dirt, resulting in virtually maintenance free, continuous operation and lower installed cost.


Conclusions


The refinery team was pleased to report that the newly installed MT100 multipoint flow meters have been in continuous, successful operation for nearly a year. The plant team has improved the efficiency of its boiler system, lowered its operational cost and reduced its environmental footprint by using FCI’s MT100 Multipoint Flow Meter to better optimize the boiler’s fuel-to-air mixture ratio with more accurate, dependable air flow measurement and by eliminating un-planned maintenance.


Author Contact Details Randy Brown, Marketing Director, Fluid Components International (FCI) • 1755 La Costa Meadows Drive, San Marcos, CA 92078 • Email: eflow@FluidComponents.com • Web: www.fluidcomponents.com


New exotic turbine meter for large water injection project applications


Icenta Controls, a British manufacturer of high quality turbine flow meters has introduced to its Metri Measurements range a customised high pressure turbine meter made from exotic materials (Super Duplex & 6MO Body) for a water injection application.


Water injection is a method in the oil industry where water is injected back into the oil reservoir, to increase pressure and maximise production. Through conventional methods only around 30% of the oil in a reservoir can be extracted, however water injection increases the recovery factor and maintains the production rate of a reservoir over a longer period of time.


“The Metri LTM is a versatile meter with high accuracy performance and when combined with its low cost of ownership it’s easy to see why the LTM Turbine Flow Meter is still a highly popular choice for many uses.” Stated Paul Gentle, Owner of Icenta Controls Ltd. “Icenta is constantly developing its Metri product range to encompass new materials, flow rates and connections to enable it to be used across many different industries”


A mix of chemical resistance materials were used to achieve application and product compatibility and long term service. 6 Mo (UNS S31254) is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength making it the ideal material for Oil and Gas - Water Injection applications. Other material were used for internal wetted parts. Each Turbine rotor and support being machined from exotic materials.


For More Info, email: email:


For More Info, email: email:


47981pr@reply-direct.com


For More Info, email: email:


47853pr@reply-direct.com


Flow control in industrial environments In industrial applications,


especially in the chemical, process and oil and gas industry, corrosion can be a real challenge. These types of industries are coping with demanding environmental and process conditions in production and operation. Prevention or control of corrosion by inhibiting often proves to be an economic solution.


A corrosion inhibitor system will add (inhibit) small concentrations of (bio)chemicals into the process. The effectiveness of an inhibitor system greatly depends on the correct injection amount, and can also be influenced by the environmental and process conditions; so accuracy is crucial here.


Using a low flow control system containing a Bronkhorst® mini CORI-FLOW mass flow


meter can help you dose amounts of corrosion inhibitors more accurately. High accuracy and high turndown ratio is achieved based on pure mass measurement with this flow meter. It can directly control valves and pumps by on-board PID control and can be further optimised with PLC and HMI control extending both performance and flexibility.


Bronkhorst’s Coriolis dosing system approach enables real-time monitoring, control and logging of injection rates. This allows online checking of flow rates and instantaneous re-setting of the required flow rate. Asset management and preventive maintenance is supported with several active diagnostics.


ANNUAL BUYERS GUIDE • WWW.PETRO-ONLINE.COM For More Info, email:


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