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AFT Blog

Welcome to the Applied Flow Technology Blog.
Trey Walters

May the Force Be With You: Evaluating Unbalanced Forces Caused by Waterhammer

A common task among pipe stress engineers is to evaluate loads on pipe systems caused by waterhammer. Since AFT Impulse 4.0 was released our users have had the ability to calculate waterhammer-induced unbalanced forces for use in any pipe stress analysis application. In addition, our users can create specially formatted transfer files for direct use in CAESAR II and TRIFLEX . However, the process of calculating such forces in AFT Impulse and then applying them in pipe stress software is not as straightforward as it sounds. Our customers have asked for assistance in this process. I have teamed with Jim Wilcox of...
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Applied Flow Technology

Calculating Energy Costs

AFT Fathom and AFT Arrow have the option to include energy costs in the Output. To utilize this option, first open and fill out the “Cost Settings” window which can be opened from the Analysis dropdown menu. Next open the specification windows for the pumps that you would like to calculate energy usage for, and select the option to “Include Cost in Report” from the “Cost” tab. After running the model, you will be able to review the new cost data in the output.  The cost report is configurable in the Output Control window.      
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Ben Keiser

Problems With Heat Exchanger Specified Heat Rate In Constants?

Using “Specified Heat Rate In Constants” for the thermal model of heat exchangers can often cause problems in system models.  The reason why is because this thermal model type causes the heat exchanger to act like an “assigned heat input” junction as does an assigned flow junction does for providing constant flow rates.  Another problem is that this thermal model can cause unrealistic temperature changes across a heat exchanger.  When the heat rate is specified and the mass flow rate and heat capacity are calculated based on the system solution, the temperature change will be whatever is required to maintain the...
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Recent Comments
Des Aubery
Very useful tip. Thank you. In many heat-exchangers, the relationship between heat-transfer & flow-rate would have a curve with c... Read More
Wednesday, 10 April 2013 09:37
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Trey Walters

My 50th Anniversary Visit to the Site of John Glenn’s First American Flight Into Space

Many of you probably saw in the news that today, Monday, February 20th, is the 50 th anniversary of John Glenn’s flight into space. The flight was aboard a Mercury-Atlas rocket dubbed Friendship 7. This historic event was a significant step on the way to the Apollo missions to the moon. By good fortune the NASA contractors at Kennedy Space Center had scheduled an AFT training class last week, and I traveled to Florida to teach the class. I took some time to tour the Space Center and Cape Canaveral one evening and was able to visit Complex 14 where the launch took place....
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Trey Walters

Why I Like Bill Gates More Than Steve Jobs

I have an iPod - to which I am very attached. I have had my iPod Nano for a couple years now. All of my kids and my wife have iPods. I hike frequently in the Colorado Mountains near where I live and I can’t do it without my iPod. I can’t work out at the gym without my iPod. I can’t drive my car without my iPod. I have an iPhone – to which I am very attached. I have had my iPhone for about 6 months now. It goes with me everywhere and – along with AT&T – was...
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Applied Flow Technology

Integrating Component and Fitting Losses into a Single Pipe on the Workspace

Many components, such as isolation valves, elbows, and adjacent area changes, do not need to be modeled graphically when a simple k factor will suffice. In these cases, the AFT Fathom user can simplify and avoid unnecessary workspace clutter by integrating this data into a single pipe specification, using the Fittings & Losses tab. Fathom has a built library of component loss data provided by Miller, Crane, and Idelchik. The Fathom user can quickly and easily pick from a database of components, enter the quantity, and click OK. It is important to note, however, that Fathom uses the size of the...
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Recent Comments
Ray Cameron
Gerardo, thank you for your interest in our software. Free demo downloads are available by simply going to https://www.aft.com/dow... Read More
Wednesday, 08 February 2012 01:09
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Applied Flow Technology

Backup Files

All AFT Products automatically generate backup files each time you save your model. Backup files will be saved to the same location you have saved your model file to. They will have the exact file name as your model, but rather than having the extension *.fth, *.aro, *.imp, etc., they will have the extension *.001, *.002, *.003, etc. Every time you click save while working in your model, a new backup file will be created. If the maximum number of backup files already exists, the new backup file will overwrite the oldest backup file. The maximum number of backup files created...
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