differential pressure Archives - Emerson Automation Experts - Emerson Automation Experts

Posts Tagged ‘differential pressure’

Pressure Drop across Control Valves

Posted in Final Control Element on Wednesday, July 3rd, 2019. No comments yet
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Let’s end this short week for the United States of America’s 4th of July Independence Day holiday with an educational video from Emerson’s Fisher Valves & Instruments YouTube channel. The video, Control Valve Sizing Basics: What is Pressure Drop?, describes what this is, how to calculate it, and its importance in the selection of the […]

Sizing and Specifying Orifice Plate Flowmeters

Posted in Flow on Thursday, June 27th, 2019. No comments yet
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An Emerson whitepaper, Fundamentals of Orifice Meter Measurement, shares the history of tried-and-true differential pressure (DP) measurement across an orifice plate (orifice plate flowmeters) to measure flow rate, which dates back to the end of the 1700s. The first recorded use of an orifice device for fluid measurement was in 1797 by Giovanni B. Venturi, […]

Selecting the Right DP Level Device for the Temperature Conditions

Posted in Level on Tuesday, September 12th, 2017. No comments yet
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With the season in change from summer to autumn here in the northern hemisphere, let’s look at differential pressure (DP) level measurement performance at various temperature ranges and particularly at cold weather performance. This quick 2:35 YouTube video, DP Level Solutions Optimized for Cold Climates: Improved Response Time, highlights the importance of selecting the right […]

Sizing Control Valves for Outgassing Applications

Posted in Final Control Element on Monday, June 27th, 2016. 3 comments so far
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Think about what occurs when you open a bottle of champagne. Immediately the pressure inside the bottle drops to atmospheric pressure. This is below the pressure that allows the dissolved carbon dioxide to remain in solution, thus the CO2 gas is released. This sudden release of the dissolved gas is referred to as “Outgassing.” You […]

Calculating Fluid Density Changes in Foundation Fieldbus Devices

Posted in Flow, Oil & Gas on Thursday, February 11th, 2016. No comments yet
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I received this question on density measurement and wanted to share what I found out. I understand all dP flow measurements are affected by the density of the fluid (liquid or gas) flowing through orifice, annubar, pitot tube, etc. Most dP measurements in process measurements make an assumption of the density of the fluid. I […]