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Dylan actively works to improve AFT customers' experiences as an Applications Engineer. He quickly troubleshoots models and teaches hydraulic concepts and modeling techniques to other engineers over the phone and at AFT seminars. Dylan is currently pursuing licensure as a Professional Engineer in the state of Colorado. He holds a Bachelor's of...

Dylan actively works to improve AFT customers' experiences as an Applications Engineer. He quickly troubleshoots models and teaches hydraulic concepts and modeling techniques to other engineers over the phone and at AFT seminars. Dylan is currently pursuing licensure as a Professional Engineer in the state of Colorado. He holds a Bachelor's of Science in Mechanical Engineering (2014) from Colorado School of Mines.

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Dylan Witte

Calibrate Your Pipeline Using GSC

You’ve built your AFT Fathom or AFT Arrow model, defined all pipes and junctions, specified your fluid properties and defined your pressure boundary conditions. But for some reason, your predicted flows are still not matching measured data. AFT Fathom or AFT Arrow is properly solving the fundamental equations, but it is likely that something is off in the inputted data. In many cases, this is the pipe’s resistance. Many factors can alter a pipe’s resistance, but the two primary reasons resistance may be incorrect is (1) corrosion of the pipe over time, which increases a pipe’s absolute roughness and (2) the buildup of residue on the walls of the pipeline, known as scaling, which decreases a pipe’s inner diameter. This decrease in diameter is very important and will increase a pipe’s resistance dramatically. Now you have a dilemma. You can’t cut open your pipe to see how much scaling there is or how much your pipe has corroded. What is the condition of your pipe? Using AFT Fathom GSC or AFT Arrow GSC, you can find out!

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Recent Comments
Guest — Caitlyn
Dylan--I'm trying to apply GSC scaling on a completely defined suction model, but the only variables I can specify are for junctio... Read More
Thursday, 17 March 2016 16:39
Dylan Witte
Hi Caitlyn, Using pipe parameters such as roughness, scaling, design factor, or insulation thickness as variables for GSC is a ne... Read More
Thursday, 17 March 2016 17:06
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Dylan Witte

Don’t Be Negative! Be Positive!

Often times when building larger network models, you may not be sure what the direction of the flow will be and running the model is the only way to determine the flow direction. In the below AFT Arrow model it might be hard to determine what way the flow convention is in some of the loops. After running this model there are cautions stating that flow is negative through junctions that may have loss factors that are dependent upon direction. What is the easiest way to fix this? You could compare your results, remember or make a table of what pipes...
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Guest — Elham
It would be more interesting if the program can define the flow direction itself, this way changing manually the input again and r... Read More
Monday, 11 January 2016 16:13
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Dylan Witte

Is the Pipe Half Full or Half Empty?

Well that depends on how optimistic you are, but either way you can model partially full pipes with AFT Impulse! This means partially full along the axial direction, as opposed to partially full along the radial direction. This function only works for pipes that have a slope, and when the pipe is partially full it drains from the end with the higher elevation. Pipes which contain vacuum breaker valves, exit valves, spray discharges, or assigned pressures at the outlet can drain or fill during the transient. This draining or filling is limited to the specified pipe. AFT Impulse will not model...
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Dylan Witte

It's Only Logical!

Many engineers are familiar with how “Add/Or” logic works in computer coding or in control systems, which are used often to control transient events such as valve closures and pump start-ups. “Or Logic” determines the conditions that prevent a specific event from happening unless one event OR another event happens. “And Logic” determines the conditions that prevent a specific event from happening unless one event AND another event occur at the same time. It is possible to create this type of logic model within AFT Impulse and AFT Fathom XTS by creating a sub-model within your workspace. This sub-model would not...
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Dylan Witte

Using Liquid Accumulators in AFT Impulse

Many engineers are familiar with gas accumulators and their ability to aid in surge suppression modeled in AFT Impulse, but what about liquid accumulators? Liquid accumulators are different from gas accumulators in that they are assumed to be liquid full and do not have any gas that can compress and expand in order to dampen pressure spikes caused by water hammer.  Liquid accumulators change the system response to pressure spikes, but they operate differently than gas accumulators. There are only three required input parameters for liquid accumulators; Elevation, Elasticity, and Initial Volume. Figure 1: Liquid Accumulator Properties Window Initial Volume is...
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Recent Comments
Aaron Ren
It is great! I didn't use liquid accumulator and it is very helpful for me. And I have a problem about your figure 4 and figure 5,... Read More
Friday, 29 May 2015 05:31
Dylan Witte
Hi Aaron, To create multiple plots on the same graph I created several different groups and then used "Plot Multiple Paths Using ... Read More
Friday, 29 May 2015 19:11
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