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Ben Keiser

Easily Model Multiple Pump Configurations with ONE PUMP!

AFT Fathom 8 can be used to quickly and easily model multiple pump configurations with different pump speeds and impeller sizes.  First, determine a particular pump curve to use from either a manufacturer’s pump curve or pump curve verification test data.  Next, determine new pump curves for head and flow using the affinity laws considering either a change in pump speed or impeller size.  The multiple pump curve data sets will then be entered for each particular pump configuration. In Figure 1 (click on the image to see it larger), there are a few pump configurations that have already been defined. ...
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Trey Walters

Are Technology and Automation Really Destroying Jobs?

I remember as a child watching an episode of the Twilight Zone where a man replaces all of  the workers in a factory with machines. The episode treated this topic as morally corrupt. And my childlike mind agreed. I remember feeling badly for all the people who lost their jobs and thinking, philosophically, how one day machines and computers could replace all jobs and no one would have any work to do. A quick Google search turned up the title of this episode:  The Brain Center at Whipple's . Over the last year I have come across a host of articles, television...
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Jean Verot
I recently went to a conference on the actual crisis and it was said that 50% of the goods we are using today did not exist 20 yea... Read More
Thursday, 07 February 2013 07:26
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John Rockey

Balance Energy At Junction … What?

AFT Fathom has the ability to model heat transfer. The default mode (found in system properties) is “Constant Fluid Properties”. To avoid confusion in the default mode, several of the heat transfer input fields and option boxes are invisible or disabled until one of the following heat transfer modes are employed:  Heat Transfer With Energy Balance (Single Fluid) Heat Transfer With Energy Balance (Multiple Fluids) Upon selecting one of these heat transfer modes, the user may notice an option box labeled “Balance Energy at Junction”; found at the lower left of the first tab in the properties window for the Assigned...
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Trey Walters

What do NASA, DuPont, GDF Suez and the University of Arkansas know about AFT software that you may not? Watch it here!

Introducing Applied Flow Technology Fluid transportation is an integral part of today's society. AFT software products have emerged as world leaders in helping engineers move fluids more safely and efficiently. There are countless examples of this. We have chosen four such stories to help engineers understand how our products can help them solve problems and improve their engineering designs and operations. We developed a video to tell this story. Watch it here! DuPont The first story talks about how AFT Fathom  helped DuPont solve a serious operational problem in three newly designed slurry systems. I co-authored a technical paper along with...
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Applied Flow Technology

Using Three Way Valves in AFT Fathom

AFT Fathom provides a Three Way Valve which increases the Engineer’s capability to model system control. The Three Way Valve Properties Window shows the three connecting pipes in drop-down lists, which allows users to specify which pipe is the combined flow pipe, and which two are the split flow pipes. By entering the loss profile through each flow path, and then by selecting the actual percent open, Fathom will calculate the actual loss values for each flow path. Using the Three Way Valve in conjunction with the Goal Seek & Control module (GSC) increases the Engineer’s capability to model I&C logic...
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Trey Walters

World Languages and Waterhammer

The demand for our AFT Impulse waterhammer modeling software and associated training seminars has been growing steeply in recent years. I frequently travel internationally to teach  seminars on waterhammer. When I do I make it a point to find out what the engineer's local language calls waterhammer. For those who are not familiar with waterhammer, it is a transient phenomenon that occurs in liquid pipe systems when some event causes a departure from steady-state flow. The English language term waterhammer is a bit confusing. As it has the word "water" in it, it implies a process involving water. But the English term...
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Ben Keiser

Curious About Modeling Relief Valves?

Relief valves can be modeled in four different configurations with AFT products and they are shown in the figure below.  The required inputs for modeling a relief valve are the valve type, cracking pressure, valve loss model, and the exit pressure in the case of relieving to the atmosphere.     There are three types of relief models available:  Internal (Cases 1 & 1a), Relief Valve at Exit (Case 2), and Inline Exit (Case 3).  In cases 1 and 1a, the relief valve is relieving into vent piping downstream of the valve.  Note that there is initially no flow in the pipe...
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