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AFT Announces the Release of AFT Fathom 10

COLORADO SPRINGS, COLORADO, USA – May 2018 – Behind each AFT Fathom model is a real person, a real company and a real problem that at one point needed solving. And that's exactly what customers have done with the help of AFT Fathom for almost 25 years - they solve fluid flow problems. 

With international recognition as the leading software to design, analyze, and solve piping system problems, Applied Flow Technology (AFT) has announced the release of a significant upgrade to AFT Fathom with version 10.

Trey Walters, P.E., President of Applied Flow Technology says, “AFT’s reputation for technical depth is now accompanied by our ability to integrate more than ever with Excel, GIS Shapefiles, CAESAR II, EPANet, ROHR2, AutoCAD Plant 3D, SmartPlant, PDS and CADWorx as well as utilize 2D or isometric pipe model viewing. These factors add a level of ability to not only efficiently model and analyze a system, but to present it to others in a cohesive fashion.”

New features include:

  • Import piping layouts from CAESAR II® Neutral files
  • Import Piping Component Files(*.pcf). from SmartPlant®CADWorx® and AutoCAD Plant 3D, and others.
  • EPANET import / export
  • Enhanced Excel integration including the new Excel Export Manager
  • Utilize 2D or isometric user interface
  • Delineated input for rotodynamic (centrifugal) and positive displacement pump data
  • Automatically determine the acceleration head in positive displacement pump suction piping to prevent cavitation and performance issues
  • Enhanced heat transfer including external convection coefficient calculation, buried pipe heat transfer, and heat tracing

 About AFT Fathom

AFT Fathom is fluid dynamic simulation software used by engineers around the world to calculate pressure drop and flow distribution in liquid and low velocity gas piping and ducting systems.

Simply put, AFT Fathom helps engineers understand their piping system and predict how pipes, valves, pumps and other components interact with each other. It allows them to easily model, analyze and simulate their systems in order to evaluate the performance of new designs and assure all design requirements are met.

AFT Fathom truly helps engineers accurately select and size components, so they can produce less costly and more reliable piping systems. The software’s output data will even summarize the codes and standards used within the model. 

 AFT’s extensive portfolio of customers includes a majority of leading international companies and engineers. From theme parks to aerospace, and refineries to power generation, AFT Fathom has been used to identify solutions and create proactive designs within the worlds most advanced piping and ducting systems.

View the full list of AFT Fathom features and download a free trial demo at www.aft.com/products/fathom.

 

 

ImageGrafix Dubai

Channel Partner Spotlight - ImageGrafix Dubai

AFT is a global company. We work with an excellent network of channel partners around the world. These partners provide sales support, technical support and training in local languages, time zone and currency.

One of our fastest growing partners is ImageGrafix Dubai. They serve not only United Arab Emirates where they are located, but the whole Persian Gulf region. They have engineering and sales staff that have lived and worked for many years in Kuwait, Qatar and Saudi Arabia. They have been in Dubai for over 20 years and have a well-earned reputation for providing quality service to their customers.

ImageGrafix Dubai specializes in Pipe Flow Analysis & Systems Design, Pipe Stress, Thermal Analysis & Modeling Solutions and Industrial Training/Consulting.

AFT is excited to partner with ImageGrafix to provide solutions to the Persian Gulf area which will help then design safer, more reliable and more cost-effective fluid transfer systems.

Click here to view all of AFT's Channel Partners  

 

     

Venkat Raman at a recent ImageGrafix/AFT workshop in Abu Dhabi

 

Liquids And Gases And Slurries, Oh My!

One of the best advantages to AFT software tools is they offer a full solution for any single-phase pipe flow analysis calculations. 

Whether you are dealing with liquids, gases, or slurries in your piping systems, AFT can handle it!  The interface and overall functionality for each product is the same.  Therefore, there is no need to worry about having to deal with a separate learning curve for each product. 

 

If you know how to use AFT Fathom, then you are over the learning curve by about 90%

when it comes to knowing how to use AFT Arrowand about 80% of how to use AFT Impulse

 

Also, each product has a few add-on modules.  When you learn the powerful time-saving capability of the AFT Fathom Goal Seek & Control (GSC) module, this knowledge translates directly to using the AFT Arrow Goal Seek & Control (GSC) module.  Dealing with slurries using the AFT Impulse Settling Slurry (SSL) module is no different than working with the AFT Fathom SSL module.

The other significant advantage is that any AFT model file can be imported or exported between any AFT product.  This is incredibly useful because if you need to do a steady-state analysis with AFT Fathom, then find out later that you’re tasked with a waterhammer (surge) analysis project, you can easily open your AFT Fathom model directly within AFT Impulse. 

No need to re-build the model from scratch!  All you would need to do is:

  • Define your transients
  • Section the pipes
  • Specify the simulation duration
  • Then evaluate the results.

 Overall, with the ease of usage, identical interface and functionality of each product, and the ability to transfer models between each AFT product, AFT is your one-stop shop for any liquid, gas, or slurry need you have.

 

 

 

 

AFT President to Present Three Papers at ASME Pressure Vessels & Piping (PVP) Conference

The ASME 2018 PVP Conference promises to be the outstanding international technical forum for participants to further their knowledge-base by being exposed to diverse topics, and exchange opinions and ideas both from industry and academia in a variety of topics related to Pressure Vessel and Piping technologies for the Power and Process Industries. 

AFT President Trey Walters will present the following three papers at the conference in Prague: 

1. WHEN THE JOUKOWSKY EQUATION DOES NOT PREDICT MAXIMUM WATER HAMMER PRESSURES

Co-author: Robert A. Leishear, Ph. D., P. E., Leishear Engineering, LLC., author of Fluid Mechanics, Water Hammer, Dynamic Stresses and Piping Design

ABSTRACT

The Joukowsky equation has been used as a first approximation for more than a century to estimate water hammer pressure surges. However, this practice may provide incorrect, non-conservative, pressure calculations under several conditions. These conditions are typically described throughout fluid transient text books, but a consolidation of these issues in a brief paper seems warranted to prevent calculation errors in practice and to also provide a brief understanding of the limits and complexities of water hammer equations.

To this end, various issues are discussed here that result in the calculation of pressures greater than those predicted by the Joukowsky equation. These conditions include reflected waves at tees, changes in piping diameter, and changes in pipe wall material, as well as frictional effects referred to as line pack, and the effects due to the collapse of vapor pockets. In short, the fundamental goal here is to alert practicing engineers of the cautions that should be applied when using the Joukowsky equation as a first approximation of fluid transient pressures.

 

2.  A PROPOSED GUIDELINE FOR APPLYING WATERHAMMER PREDICTIONS UNDER TRANSIENT CAVITATION CONDITIONS PART 1: PRESSURES 

Co-authors: Matthew Stewart, P.E. and Greg Wunderlich, P.E., both of AECOM (and customers of AFT) and Erin Onat, Applied Flow Technology

ABSTRACT

Waterhammer analysis (herein referred to as Hydraulic Transient Analysis or simply "HTA") becomes more complicated when transient cavitation occurs (also known as liquid column separation). While standard HTA transient cavitation models used with analysis based on the Method of Characteristics show good correlation when compared to known test/field data, the great majority of test/field data are for simple systems experiencing a single transient. Transient cavitation in more complicated systems or from two or more independently initiated transients have not been validated against data.

Part 1 of this paper describes the various safety factors already provided by ASME B31.3 for pressure containment, provides criteria for accepting the results of HTA calculations that show the presence of transient cavitation, and makes recommendations where the user should include additional safety factors based on the transient cavitation results.

Situations are discussed where waterhammer abatement is recommended to reduce hydraulic transient pressures and forces, and for increasing confidence in HTA results in specific cases. The result is a proposed comprehensive and pragmatic guideline which practicing engineers can use to perform waterhammer analysis and apply pressure predictions to pipe stress analysis.

 

 3.  A PROPOSED GUIDELINE FOR APPLYING WATERHAMMER PREDICTIONS UNDER TRANSIENT CAVITATION CONDITIONS PART 2: IMBALANCED FORCES

Co-authors: Matthew Stewart, P.E. and Greg Wunderlich, P.E., both of AECOM (and customers of AFT)

ABSTRACT

Waterhammer analysis (herein referred to as Hydraulic Transient Analysis or simply "HTA") becomes more complicated when transient cavitation occurs (also known as liquid column separation). This complication is exacerbated when trying to predict imbalanced forces as this often involves comparing pressure times area ("PxA") forces at two locations (for example at elbow pairs). Whereas the pressure at each elbow location has increased uncertainty because of transient cavitation, the difference in PxA forces at elbow pairs involves subtracting one potentially uncertain pressure from another uncertain pressure. Exacerbating this uncertainty yet further, the existence of vapor in a liquid system can dramatically affect the fluid wavespeed and, hence, the timing of the pressure wave travel between two locations such as elbow pairs; so the pressure calculated at each location would not actually occur at exactly the same time.

This Part 2 discusses methods of accounting for uncertainty in HTA imbalanced force predictions due to cavitation. The criteria in this paper assume that cavitation in the HTA has been assessed and accepted per the criteria in Part 1 of this paper.

A guideline is proposed for accepting and applying such results and, in particular, makes recommendations on safety factors to use in pipe stress analysis for different cases. The specific recommendations depend on numerous factors including:

  • Presence or absence of cavitation in hydraulically connected or isolated parts of the system
  • If cavitation occurs, whether the peak forces occur before or after cavitation first occurs
  • Size of the cavitation vapor volumes with respect to the computing volumes
  • Use of point forces as a conservative substitute in place of potentially less certain elbow pair forces or the manual assessment of maximum envelope values for the force. 

Situations are discussed where waterhammer abatement is recommended to reduce hydraulic transient forces, and for increasing confidence in HTA results in specific cases. The result is a proposed comprehensive and pragmatic guideline which practicing engineers can use to perform waterhammer analysis and apply imbalanced force predictions to pipe stress analysis.

 

 

 

AFT Impulse Adds ROHR 2 Force Files Interface

 

With the February 21, 2018 maintenance release of Impulse 6 came a cool new feature. AFT added the capability to interface piping layout and dimensional data from ROHR2 force files.

This capability was already available for CAESAR II and TRIFLEX force files and will also be available in the AFT Fathom & AFT Arrow maintenance releases soon. 

Applied Flow Technology (AFT) strives to continuously enhance our interfaces to give users extended flexibility when designing their piping systems. Be on the lookout for even more partnering as AFT is soon to release AFT Fathom 10 this Spring and shortly followed by AFT Arrow 7 and AFT Impulse 7. 

With powerful solutions and user-friendly interfaces, Applied Flow Technology (AFT) is a leader in the pipe flow modeling software market. Our software is used to analyze, model, and simulate piping and ducting systems to help industries around the world design safer, more efficient systems and solve operational problems. AFT’s products are developed by engineers with extensive experience in the design and construction of piping systems and the development of analytical modeling methods. For information, visit www.aft.com or contact one of our 70 international Channel Partners.