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AFT Blog

Welcome to the Applied Flow Technology Blog where you will find the latest news and training on how to use AFT Fathom, AFT Arrow, AFT IMpulse, AFT xStream and other AFT software products.
Reinaldo Pinto

How AFT Impulse Can Help Engineers Comply With ASME Codes

Summary Engineers are often responsible to design systems to comply with codes and standards. In recent years codes that apply to waterhammer and surge pressures have become more prominent. Increasingly AFT Impulse is being used to help engineers comply with such codes. Once AFT Impulse has calculated the maximum pressure due to a transient event, what shall the designer do with this value? The answer to this question depends on the code that is being used as the piping design basis. In this article, we’ll be discussing how two important piping design codes - B31.4 and B31.3 - deal with surge...
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Guest — Geoffrey Stone
Many engineers overlook the issue of Owners approval contained in ASME B31.3. Major oil companies have their own overriding stand... Read More
Friday, 29 June 2012 23:54
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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 AFT's distributor in Canada...
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Applied Flow Technology

Export Input and Output Data to MS Excel

While reference is made to MS Excel, this is applicable in principal to most any spreadsheet. Exporting to Excel has number of potential uses including; facilitating input or output data comparison across multiple models files or scenarios using Excel formulas, post analysis calculations, specialized graphing or inclusion into an Excel based report. There are basically two ways to export to Excel; Using File/Export Model Data... when the Model Data window is active or, when the Output window is active, using File/Export Output..., orCopying a select area of the Model Data or Output window and pasting into Excel. When using the first...
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Applied Flow Technology

Multi Scenario Output

Viewing the output from multiple scenarios in the same window can be a valuable and time saving tool! You must have output available for each of the scenarios you would like review. One way to do this is by executing a batch run: Select “Start Batch Run…” from the file menu.Click “Add Scenarios” and select which scenarios you would like to include in your multi-scenario output.Click “Start Run” and sit back while each of the scenarios is run. In order to view output from multiple scenarios in the same window, follow these steps: Browse to the Output window of one of...
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Applied Flow Technology

Printing Input and Output

You can print all of or select portions of your model data window in order to have a hard copy of your input. Likewise you can print all of or select portions of your output window in order to have a hardcopy of the output. Printing both of these windows allows you to have hardcopies and backups of everything you would need to perform calculation checks on your model. After building your model and entering all of the required data, browse to the Model Data window and click “View/Model Data Control”. After setting up the input data to be displayed, click...
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Applied Flow Technology

How to Fill as Quadratic

Filters and screens impose a pressure drop that varies with flow rate. The variation is non-linear, but manufacturers will often provide only one data point for pressure loss at the design flow rate. Using a single point, or constant pressure drop, can produce significant inaccuracies in your model. With this in mind, AFT offers the “Fill As Quadratic” option for entering loss data.   Using only a single point, “Fill As Quadratic” will create two additional points for you. This first is simply 0,0; zero flow produces zero pressure drop. The second point is 2 x Flow and 4 x Pressure...
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Applied Flow Technology

Jumping From Pipe to Pipe or Junction to Junction

You can jump from junction to junction or from pipe to pipe by pressing F5 while in a specifications window.
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