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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.

Calculating Results in Pipes and Junctions Not in Service

AFT flow modeling software allows you to easily change system line-up by closing junctions and pipes. How you take a portion of a system out of service affects what calculated results are available in output. Let's take the case where we have a valve, pipe, heat exchanger, pipe and valve in sequence. To close one of the valves we can either open its specifications window, select the Optional tab and check 'Special Condition / Closed' or simply click the valve junction to select it then click the Special Condition button on the toolbar. A red "X" will appear next to the...

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Right Clicking (or left clicking if you're a 'lefty' like the author)

Right clicking a pipe or junction in Workspace is a quick way to display a summary of input data for the object, but is only one of three options available when right clicking - Right click only - opens the 'Inspection window' displaying a summary of the object's input data[shift]+right click - lists missing, required input information[ctl]+right click - display output information.

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Applying a Default Unit System

AFT software supports ISO and English units and provides a variety of ways to select the units to be used. For example, in the Output window you can change units 'on the fly' for a specific parameter by double clicking an output column header and selecting the desired unit from the Change Units window. To globally change the unit system, go to the Options menu and select Parameter and Units Preferences. Select the Unit Preferences tab, choose the Default Unit System then click the Apply Default Units button. This will both apply the default units for the selected unit system and...

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Setting Preferred Units

To choose only English or SI units, go to the Options menu, select Parameter & Unit Preferences, then the Unit Preferences tab. Choose the Default Unit System then click the Apply Default Units button. This will set the units to be used both on input and output windows.

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Modeling Valve Opening in Fathom XTS

To model a valve opening transient from the closed position, apply the Special Condition / Closed on the specifications window Optional tab. Transient Data then starts with Cv = 0, increasing to the full open Cv value, or, if modeling the valve loss as a K value, transient data starts with K = -1 (K = infinity), decreasing to a K value for the open position (all K values other than the full closed K value are positive).

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Reviewing Output in the Workspace Window

You can see output in the Workspace window by pressing the CTL key while right-clicking a pipe or junction (left-clicking for a left handed mouse). Output displayed is that currently selected within Output Control so, if you don’t see the information you’re looking for, simply open Output Control from the Analysis menu and add the desired parameter to the ‘Show Output’ list.

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Design Alerts

Design Alerts provide easy identification of output parameters that exceed specified limits and are available in all AFT pipe flow modeling software. Found on the Design Alerts tab of the Pipe Specifications window, an alert is defined by; Selecting the parameter upon which the alert is based from the available list (pressure, flow, velocity, etc.), Checking ‘Minimum’ or ‘Maximum’ (i.e. alert if the parameter value falls below the specified minimum of above the specified maximum), Specifying the value and units and, Clicking the ‘Add’ button to add it to the alert list. Any number of alerts may be defined for a...

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