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Ben Keiser

Defining & Running 12 Scenarios in Less than 10 Minutes

A couple weeks ago, I wrote a blog article about the features, functionality, and how to use the Scenario Manager  effectively in order to help the engineer save lots of time.  In this article, I'm going to demonstrate a practical example of how it is possible to setup 12 different scenarios and run them in less than 10 minutes!  The important thing to pick up from this practical example is the  thought process on how to setup the scenario tree in the most effective and efficient manner possible. Consider the system below in Figure 1 where three liquid hydrocarbons at...
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Ben Keiser

How Many Models of the Same System Do You Have?

Well, if the answer is "more than one", then you are probably struggling to deal with way more model files than you need to be.  With all AFT products , the Scenario Manager is an incredibly powerful feature that allows one to model several different cases within a single model file. This includes different operating conditions, multiple pump configurations, different piping, system expansions, hot days, cold days, insulation, fouling and pipe scaling, etc. The list of different cases that can be modeled is essentially endless! So, I have said it once, and I will say it again... The Scenario Manager...
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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...
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Ben Keiser

Feeling Compressed? Don’t Forget Your Thermodynamics

When dealing with a compressible gas system, heat transfer and thermal effects are very important to account for.  When a gas is flowing down a pipeline, it will cool down as the gas expands due to the frictional pressure drop.  Many would say that adiabatic or isothermal conditions will bracket the potential flow rates that are possible for a constant pressure drop in a pipe.  However, this is not the case.  If a gas is cooled or heated as it flows down the pipeline, the flow rates that can result for a given pressure drop can actually be outside the...
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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...
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Ben Keiser

Dynamic Mixing Calculations in AFT Arrow

In AFT Arrow , there are three types of fluids that can be modeled:  AFT Standard, ASME Steam, and Chempak.  The focus of this article will be on how to use the Chempak Database with AFT Arrow in order to perform dynamic mixing calculations .  But first, I would like to briefly introduce each of the three types of fluids that can be modeled in AFT Arrow. The gases in the AFT Standard fluid list are included with the standard AFT Arrow software.  Various equation of state models are available including Ideal Gas, Constant Z, Three Parameter, and Redlich-Kwong.  There...
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Jake Miller

Making Your Digits Significant

AFT Software is jam packed with options that allow Users to customize their hydraulic modeling experiences. Of which, are the many ways to use the data tables when viewing text based inputs and conveying results. But sometimes the defaults, for example in AFT Fathom , are not identical to how you elect to report your results. In this blog I will show you how to increase the number of significant figures in your data tables. As mentioned earlier, data tables are found in the Model Data Window as well as the Output Window. These text based interfaces contain cells much...
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