In this article, I will show you how you can use a completely free online sizing tool for Differential Pressure (DP) Flow measurement — specifically for orifice plates and other primary elements — provided by Emerson (Rosemount).
As you know, correctly sizing an orifice plate is one of the most critical tasks in flow measurement. Getting the beta ratio, differential pressure, and straight run requirements right can make or break your measurement accuracy. Having access to a reliable, free sizing tool is a huge advantage — whether you are a seasoned instrument design engineer or a fresh graduate.
In this article, I will walk you through how to access and use Emerson’s DP Flow Sizing & Selection Tool, which is an industry-recognized free engineering tool for sizing, configuring, and ordering Rosemount DP flow meters and primary elements.
What is DP Flow Measurement?
Differential Pressure (DP) Flow measurement works on a simple principle — when a fluid passes through a restriction (like an orifice plate), it creates a pressure drop. This pressure difference is proportional to the square root of the flow rate, and using this relationship, the actual flow can be calculated.
Key parameters that influence DP flow calculations include:
- Fluid density and viscosity
- Process temperature and pressure
- Pipe internal diameter
- Beta ratio (orifice bore to pipe diameter ratio)
- Type of primary element (concentric orifice, conditioning orifice, annubar, wedge, etc.)
Sizing this correctly requires following international standards like ISO 5167 or API MPMS 14.3 / AGA-3, and doing it manually is tedious and error-prone. That is exactly where this tool helps.
Emerson DP Flow Sizing & Selection Tool
Emerson’s DP Flow Sizing & Selection Tool is a free, browser-based engineering tool that streamlines the entire process of sizing and configuring Rosemount DP flow products. It covers:
- Standard concentric orifice plates
- Rosemount Conditioning Orifice Plates (requiring only 2D straight run)
- Annubar averaging pitot tubes
- Integrated DP flow meter assemblies
Key Features of the Tool
- Guided process input — Enter your fluid type, flow rate, temperature, pressure, and pipe size. The tool’s right-hand summary pane uses color-coded indicators to show which fields are complete and which are still required.
- Side-by-side product comparison — Compare up to three Rosemount DP flow products simultaneously. You can sort by parameters such as accuracy, permanent pressure loss, straight run requirement, and ease of installation.
- Detailed sizing reports — The tool generates exportable calculation datasheets and flow meter accuracy reports on demand, complete with graphs for visual comparison of accuracy class options.
- Collaboration workspace — You can share your sizing session digitally with colleagues or Emerson experts for collaborative review.
- Model number generation and ordering — Once sizing is complete, the tool directly generates a model number and provides ordering options.
How to Access the Tool
Step 1 | Visit the Website
Click the button below to go directly to the Emerson DP Flow Sizing & Selection Tool page.
Step 2 | Create a MyEmerson Account (Free)/Optional
To use the full capabilities of the tool — including saving your projects, generating reports, and collaborating — you will need a free MyEmerson account.
- Go to Emerson.com and click Sign In / Register
- Fill in your name, email, and professional details
- Once registered, log in and navigate back to the DP Flow Sizing & Selection Tool
If you are a student or fresher and don’t have a business email, you can register using your college email ID. The registration is free and straightforward.
Step 3 | Enter Your Process Data
Once inside the tool:
- Select your fluid type (liquid, gas, or steam)
- Enter process conditions — operating flow rate, temperature, pressure, and pipe diameter
- The tool will guide you through any remaining required inputs using the color-coded summary pane
- Review the recommended products and sizing results
- Compare options side-by-side if needed
- Export your datasheet or accuracy report as a PDF for documentation
Resources
Emerson also provides a free comprehensive reference guide for DP Flow measurement which is extremely useful for engineers working with orifice plates and primary elements.
Title: Fundamentals of Orifice Meter Measurement — Emerson Whitepaper
This whitepaper covers the history, theory, and best practices of DP flow measurement, and is a must-read for instrument engineers.
You can also refer to Emerson’s Engineer’s Reference Guide for DP Flow which covers primary element selection, installation, and transmitter pairing in great detail.
EndNote
I hope this article helps you discover and start using this powerful free tool in your engineering work. Whether you are sizing an orifice plate for a steam line, a gas metering station, or a liquid flow application — this tool will save you significant time and give you confidence in your calculations.
In this article, I will show you how you can use a completely free online sizing tool for Differential Pressure (DP) Flow measurement — specifically for orifice plates and other primary elements — provided by Emerson (Rosemount).
As you know, correctly sizing an orifice plate is one of the most critical tasks in flow measurement.
Getting the beta ratio, differential pressure, and straight run requirements right can make or break your measurement accuracy. Having access to a reliable, free sizing tool is a huge advantage — whether you are a seasoned instrument design engineer or a fresh graduate.
In this article, I will walk you through how to access and use Emerson’s DP Flow Sizing & Selection Tool, which is an industry-recognized free engineering tool for sizing, configuring, and ordering Rosemount DP flow meters and primary elements.
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