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Considering Control Valve Efficiency

Control valve efficiency.jpgArticle by Samson Valves: The discussions revolving around the scarcity of fossil fuels and increasing energy prices have refocused on the most effective action in the long term, i.e., reducing energy consumption. The right process automation technology can contribute to achieving considerable energy savings. Status monitoring and status conservation can be of help when optimizing the technical infrastructure by preventing additional energy consumption due to plant failures, the resulting start-up and shutdown procedures, as well as the production of non-conforming products. Three major areas can also be identified when optimizing the production process—process sizing, process monitoring, and process control. This article deals with the control valve as a final control element that can help minimize energy consumption when it is accurately tuned to its assigned task. In addition, we will look at state-of-the-art asset management concepts based on smart positioners, which facilitate energy monitoring and indicate possible savings potential thanks to optimized operating modes.

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Accurate Messurement of Water in Feedwater Heaters

The accurate measurement of liquid levels in power plant operations is key to efficient operation. Although water is a liquid that can be easily measured by numerous measurement technologies, detection in applications like feedwater heaters, for example, takes on a range of complexity that stresses even the most robust devices.

Feedwater heaters operate in various ranges depending upon the stage of the process. High-pressure heaters typically operate at 1030 psig @5500F (71 bar @2880C). Further, liquid level transmitters should operate ideally from ambient start-up to operating conditions at full capacity; a wide variation.

Torque tube and differential pressure transmitters have been the technologies of choice for many years, each technology having a set of strengths, weaknesses and idiosyncrasies. Performance of both technologies are dependent on the Specific Gravity (SG) of the medium of they are measuring; both suffer inaccuracies when the SG of water varies over temperature.

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Reasons to Consider Using a 1000 ohm Platinum RTD

Technical Note by Moore Industries: When higher resolution is required, measuring circuits can benefit from the larger signal stren1000 ohm Platinum RTD.jpggth inherent to the 1000 ohm sensor available in Moore Industries products such as the WORM Flexible Temperature Sensor. This benefit can be seen in greater accuracy when used for smaller minimum measurement spans. Each point of measurement has 10 times more resistance along with a greater change in resistance per degree.

If your application involves wiring long distances from the RTD to the measuring device and you do not have a 4-wire RTD measuring circuit, you can benefit greatly by using the 1000 ohm sensor. The error caused by the wire resistance is dramatically reduced.  Assume your measuring device is measuring RTD + Wire. The Wire resistance is the same whether the RTD is 100 ohm or 1000 ohms. But when you compare (100 + Wire) to (1000 + Wire), the error caused by the Wire is roughly ten times less when using the 1000 ohm RTD.  When making a 3-wire RTD measurement with long wire runs, use the 1000 ohm to reduce your error.

Additional Resources and Recommended Readings by Moore Industries: SELECTION GUIDE: Temperature Sensors, Transmitters and Assemblies

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Industrial Instrumentation: Download Your Free HandBook

Lessons in Industrial Instrumentation.jpgAn Easy to understand and well written book in the field of Industry Instrumentation, can be downloaded here for Free. This book is written in the form of tutorials and teaching style for quick learning of basics of Instrumentation. This book can be read by all learners such as Engineers, Senior Engineers, Technicians and people having interest in this field. Consisting of 18 Chapters, 646 Pages and Starting from basics of Science and taking it towards Instrumentation, this Book is definitely a good reference.

The major topics covered are:

  1. Physics
  2. Chemistry
  3. DC Electricity
  4. AC Electricity
  5. Introduction to Industrial Instrumentation
  6. Instrumentation Documents
  7. Discrete process Measurement
  8. Analog Electronic Instrumentation
  9. Pneumatic Instrumentation
  10. Digital Electronic Instrumentation
  11. Instrument Calibration
  12. Continuous Pressure Measurement
  13. Continuous Level Measurement
  14. Continuous Temperature Measurement
  15. Continuous Fluid Flow Measurement
  16. Continuous Analytical Measurement
  17. Signal Characterization
  18. Continuous Feedback Control

Register with this website and click here to Download your Free Book

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Measuring Molasses Temperatures with the WORM

Moore Industries has published a new white paper on an application using the WORM Flexible Temperature Sensors to measure the temperature of molasses during the production of beet sugar. Using the WORM as a replacement for standard thermowells allows site engineers to get more accurate temperature readings and maximize the amount of sugar recovered from the molasses.

American Crystal Sugar Company struggled with getting accurate temperature readings of molasses created during the process of extracting beet sugar. The molasses ran about 1 1/2-inches thick at the bottom of a pipe. Using a standard straight thermowell and a solid sheathed RTD sensor meant that the thermowell and sensor was only partially submerged. This led to inaccurate temperature measurements.

This was solved by creating a custom thermowell from 3/8-in. Stainless steel tubing with a radial bend at the end. The flexible WORM RTD sensor was inserted and secured into the newly designed thermowell. This allowed the tip of the sensor to be angled so that it was fully submerged in the molasses. The result is that site operators are able to get highly accurate temperature readings, which allows them to adjust their processes to extract more sugar from the molasses.

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