Blog - Post List

  • Temperature Blog: Thermowell Wake Frequency Calculation

    Anonymous
    Anonymous
    The first wake frequency calculation standard was published by AMSE is 1974 and was based on a paper written by J.W. Murdock in the 1950s.  This is the ASME PTC 19.3-1974 standard.  However, it did not account for all installations.  The Monju Fast Breeder...

  • Level Blog: Avoiding Shutdowns with Accurate Level Measurement

    Jim Cahill
    For plants and mills that use steam in the production process, measuring the steam condensate level accurately can be the difference between operating reliably and fighting unplanned shutdowns. So was the case for a U.S. ethanol producer, Absolute Energy...

  • Level Blog: Nuclear Level Measurement

    Anonymous
    Anonymous
    Level measurement is often times the most challenging measurement in a process plant.  There are many technologies that can be used, including differential pressure (DP), capacitance, ultrasonic and radar .  Each of these technologies can be used in many...

  • Pressure Blog: Improving Pump Reliability

    Anonymous
    Anonymous
    Pump reliability is one of the biggest rotating equipment challenges in a process plant.  There are literally hundreds of pumps to monitor and maintain.  There are three strategies which can be implemented to improve punp reliability, which will be explored...

  • Flow Blog: Advanced Diagnostics and Averaging Pitot Tubes

    Anonymous
    Anonymous
    Advanced diagnostics is the name given to a class of transmitters that provide additional information about the condition of itself and the process.  In addition to internal electronics problems, advance diagnostics can alert you to power supply issues...

  • Level Blog: Level Measurement with Foam

    Anonymous
    Anonymous
    Level measurement is often the most challenging measurement in a process plant.  Until ultrasonic and radar technology were introduced, level measurement was done with some type of contact technology.  Among these are differential pressure (DP), capacitance...

  • Flow Blog: Differential Pressure versus Vortex Flowmeters

    Anonymous
    Anonymous
    There are many kinds of flowmeters that can be used for steam and gas applications.  These range from basic variable area (rotameter) and turbine flowmeters, to more advanced differential pressure (DP) and vortex flowmeters.  While these are all good...

  • Flow Blog: Upgrading to Advanced Boiler Control

    Anonymous
    Anonymous
    Pretty much every process plant has a boiler for the generation of steam.  Steam is a commodity that is widely used around a process plant for many different applications.  These include heating, steam jacketing, steam tracing, power generation ( turbomachinery...

  • Flow Blog: Technology and Instrumentation

    Anonymous
    Anonymous
    Since the creation of the first transmitter there has been a marked shift in technology.  This includes the technology used for both transmitters and process control systems.  The early pneumatic (3 – 15 psi) systems gave way to electronic systems (4...

  • Temperature Blog: Turbomachinery, Reliability and Instrumentation

    Anonymous
    Anonymous
    Within a process plant there is all kinds of turbomachinery, including compressors, pumps and fans.  They are generally steam driven and move a lot of fluid.  They are large.  They are expensive.  The manufactures of turbomachinery will include basic...

  • Pressure Blog: Benefits of Drift Specification

    Anonymous
    Anonymous
    Since the invention of pressure transmitters, manufacturers have sought to improve their performance.  This includes accuracy, repeatability, speed of response and long-term stability.  As design methods and raw material supply has improved, all of these...

  • Temperature Blog: Wireless Transmitters and Rotating Equipment

    Anonymous
    Anonymous
    When a piece of process equipment rotates as part of its normal operation, it becomes challenging to obtain any type of measurement on the rotating part.  Rotary calcination equipment, kilns and liquid filling machines can all benefit from process measurement...

  • Flow Blog: A Great Way to Shrink the Shrinkage

    Anonymous
    Anonymous
    Custody transfer is defined as the way to measure the commercial exchange of a commodity.  When a business purchases a commodity, there is a pre-established method to verify the amount of product purchased.  Gasoline, chemicals and even milk is all traded...

  • Temperature Blog: High Density Temperature Transmitters

    Anonymous
    Anonymous
    In order to reduce installation and operational costs, process plants have ofter used RTDs or thermocouples without a transmitter for temperature measurement.  This is especially true for high density temperature measurements like distillation columns...

  • Pressure Blog: Instrumentation and Root Cause Failure Analysis

    Anonymous
    Anonymous
    When rotating equipment fails, it is quite common to perform a root cause failure analysis (RCFA).  The RCFA, unfortunately, is not done properly, as it only captures the first level of what failed and what likely caused the failure.    A true RCFA will...

  • Analytical Experts Blog: Mass Flow Measurement for Fuel Gases

    Jim Cahill
    Online communities continue to grow and prosper as the capabilities of social sites and software platforms continue to advance. I received an email from a student in France who asked: I would like information on the products you offer in mass flow measurement...

  • Temperature Blog: Improving DP Flow Measurements with Multivariable Instruments

    Anonymous
    Anonymous
    Differential Pressure (DP) flow meters have long been the common method for measuring flow in a process.  Any obstruction in a flow path creates a differential pressure which can be measured.  Using the relationship of DP and flow a fairly accurate and...

  • Temperature Blog: Accounting for Density in DP Level Measurement

    Anonymous
    Anonymous
    With 75% of process level being measured with differential pressure (DP) there are a lot of measurements that are not temperature compensated.  Although the fluid made not change any temperature effects can alter the accuracy of the measurement significantly...

  • Pressure Blog: Statistical Process Monitoring and Cavitating Pumps

    Anonymous
    Anonymous
    Cavitation is a common source of pump failure.  Vibration monitoring is the general technology used to capture this condition.  However, it does not always work because the impact of cavitation cannot be discerned within background noise.  Pressure transmitters...

  • Temperature Blog: Reliable Temperature Measurement with Dual RTDs

    Anonymous
    Anonymous
    Temperature transmitters with RTDs are the common technology for measuring process temperature.  While these are inherently reliable (there’s not much to them) process upsets and vibrations can leave you without good (and reliable) process data.  Dual...

  • Level Blog: Eliminating Temperature Effects in DP Level Measurement

    Jim Cahill
    Differential pressure (DP) measurement has long been used in tank and other vessel level measurement. Level is calculated by taking the difference in pressure divided by the specific gravity of the liquid. I caught up with Emerson’s Anshuman Prasad, a...

  • Level Blog: Guidance for Radar Level Measurement Applications

    Jim Cahill
    Recently we’ve had a few level measurement-related posts–one on a refinery desalter vessel application and another on guided wave radar setup, calibration, and diagnostics. To continue on this theme, I’ve discovered an article, Determining the level best...

  • Tank Gauging Blog: Radar Level Measurement Beginnings, Types, and Applications

    Jim Cahill
    One of my U.K.-based colleagues pointed a great article my way, Defining and refining process radar level, in the November Control Engineering Europe magazine. Unfortunately, the article is not viewable online unless you subscribe to site–so I don’t have a link for it. The article shares the history...

  • Analytical Experts Blog: Metals Extraction and Processing Liquid Analysis

    Jim Cahill
    My trusty Emerson RSS feed alerted me to a new liquid analysis application guide for the metals extraction and processing industry. This guide, published by Emerson’s Rosemount Analytical Liquid business, covers the liquid analysis solutions for the following processes: leaching and ore extraction, concentration and separation, finished product purification and waste disposal. I confess to knowing little about mining…

  • Analytical Experts Blog: Metals Extraction and Processing Liquid Analysis

    Jim Cahill
    My trusty Emerson RSS feed alerted me to a new liquid analysis application guide for the metals extraction and processing industry. This guide, published by Emerson’s Rosemount Analytical Liquid business, covers the liquid analysis solutions for the following processes: leaching and ore extraction, concentration and separation, finished product purification and waste disposal. I confess to knowing little about mining…

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