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Trey Walters, P.E. to Present to UCCS School of Mechanical & Aerospace Engineering


Mechanical & Aerospace Engineering Research Seminar Series

COLORADO SPRINGS, Colo., USA,  January 20, 2019 - Applied Flow Technology's President, Trey Walters, P.E. will present "Waterhammer Theory & Applications" as a part of the University of Colorado Colorado Springs MAE Research Seminar Series. The series is a monthly event and is open to any UCCS student and general public members who would like to attend. 

Trey is not foreign to the UCCS campus nor to any other engineering programs within Colorado. A request for Trey to either speak or guest lecture in an engineering class, or campus organizations, is a regular occurrence which Walters enjoys. He is a regular visitor at the University of Colorado Colorado Springs, University of Colorado Boulder, and Colorado School of Mines. 

While Trey has worked with waterhammer/surge issues since creating AFT Impulse in the mid-90's. He worked extensively in 2019 to spread education and create awareness on the methods associated with waterhammer and surge analysis. He presented three technical papers at the 2018 ASME PVP conference in Prague, Czech Republic and five technical papers at the distinguished 2018 Pressure Surge Conference in Bordeaux, France. Additionally, he presented a short course on waterhammer at the 2018 Texas A&M University Turbomachinery & Pump Symposium in Houston, Texas USA and has been asked to present at the 2019 conference. Finally, Trey will present at the 2019 Hydraulic Insitute spring conference in Florida USA in February. 

If you would like to attend the UCCS presentation: 

MAE Research Seminar Series 
Topic: Waterhammer theory and application
Dwire Auditorium (DWIRE 121)
Thursday, January 31, 2019
11:00am-12:00pm (MST)
All seminars are open to the public.

To subscribe to the MAE Seminar Mailing List, please send an email to This email address is being protected from spambots. You need JavaScript enabled to view it.

Applied Flow Technology Announces 2019 Platinum Pipe Award Winners 

COLORADO SPRINGS, Colo., USA, January 20, 2019  Applied Flow Technology is proud to announce the winners of our 2019 Platinum Pipe Award. Each year we recognize excellence in piping and ducting system models using AFT software.

All winners won a $500 Amazon gift card and $2,000 in software credit for their company. 

Below are the winners and condensed descriptions of their projects. Those who receive the AFT Pipeline monthly newsletter will see expanded case studies and the detailed models for each of the four winning projects as well as three projects who received Honorable Mentions. 


Most Interesting Model

  • Joel Neville of Wood in Calgary, Canada

AFT Impulse, Production Platform in Gulf of Mexico

An Impulse model of a production platform in the Gulf of Mexico owned by a multinational oil and gas company. A variety of transient cases were required to be analyzed for the complex system exporting up to 140,000 BOE per day to a subsea pipeline network. The Primary Engineering Firm created a model of the system in AFT Fathom, and Wood used this model to verify the base  AFT Impulse model. A large number of complex junctions and features were utilized to simulate complex components, events, and system logic. The model contains 81 scenarios, analyzing a range of system operations including all pump start-up and shutdown, partial pump startup and shutdown, emergency shutdown, valve closures, flow path changes, and many combinations of the above. Additionally, both cavitation models were compared in many cases to check for consistency in results, increasing confidence. The complexity of the model is evident examining the junctions used - there are 20 check valves, all with reverse closure velocities, 6 control valves with rate limits and open percentage data, a gas accumulator, 6 pumps generally starting or tripping with speed vs time profiles, 10 pressure/pressure relief valves, and almost 80 valves, dozens of which have event-based transients and many which are based on realistic characteristics. The model was drawn in an isometric fashion to facilitate the ease of understanding the 153 applied Force Sets, which were used to export to stress analysis software. Various recommendations were obtained including: non-slam check valves, decrease in pump trip set points, increase in valve stroke times, specific operating procedures, and additional structural support. In some areas, these recommendations reduced pressure pulsation by 75% and forces by a comparable amount. The model contains 277 pipes, 247 junctions, and also makes use of Variable Pipe Resistance, Design Alerts, and Fittings & Losses.

  • Arunkumar M, L&T Construction in Chennai, India

AFT Fathom with GSC, Cooling Water System for a Nuclear Fusion Project

A cooling water system containing hundreds of components needed hydraulic analysis to ensure all components met a maximum water pressure restriction. The heat transfer enabled Fathom model showed that the pressure restriction was met everywhere except for one set of components. Multiple options to reduce the pressure at this location were explored, including moving the heat exchangers, increasing line sizes, adding booster pumps, and both adding boosters along with moving the exchangers. Fathom allowed the easy comparison of various scenarios, control valve open percentage gave feedback on operation, and vapor detection allowed potential cavitation issues to be addressed. The model contains 6 scenarios, 898 pipes, and 788 junctions. This includes over 100 specified heat rate heat exchangers, over 225 correctly configured (spot checked) Detailed Tees, and over 200 valves. Also utilized in the model were Design Alerts and Fittings and Losses.

Correlation to Test/Field Data

  • Daisy Ambach, Hatch in Dorking, United Kingdom

AFT Impulse, Hazard and Operability Study of Water Injection System

Project Description: The client completed a HAZOP study for one of its operational production facilities in the North Sea. The HAZOP committee were tasked to re-validate the design and operation of the production facility in accordance with regulatory requirements, identify any safety critical issues and recommend appropriate actions where necessary. They identified a range of actions related to relief and blowdown; piping; and flow assurance. During the HAZOP, it was noted that a surge analysis had not been conducted for the water injection system at the site. In case of a remote facility trip or a closure of a shutdown valve in the system, the committee identified that the only safeguard in place for pressure surges is the piping design pressure. Data being compared are measurements of pressure and flow during steady state analysis at key points such as the pumps and heat exchangers. On average a match of 8% match was found, with 13 % as the maximum difference and 0% as the minimum.

Operational Benefits and Sustainability

  • Manas Karnure, Swapnil A. Paingankar, and Dhiresh Mahajan, Ingenero Technologies Pvt. Ltd. In Thane, India

AFT Fathom, Hot Oil Network at Petrochemical Facility

Project Description: It was envisaged that a hot oil network in a petrochemical facility owned by Ingenero’s client be examined to explore possible energy savings avenues. The preliminary understanding was that the network was being operated with high pump discharge pressure and the pressure drops across certain control valves were excessively high. The client wanted the energy optimization be carried out with least possible and ccost-effective configuration changes in the hot oil network. The focus of the hydraulic modeling was to reduce power consumption and make the operation energy efficient by focusing on pump energy consumption and control valve settings. The implementation of Ingenero’s recommendations resulted in 40% energy savings.


Applied Flow Technology is already accepting entries for the 2020 Platinum Pipe Award. Entry deadline is October 31, 2019.  To enter, or for more details, visit: https://www.aft.com/about-aft/platinum-pipe-award

AFT Partners with Softdesk CS of Poland


COLORADO SPRINGS, Colo., USA, December 12, 2019 -- Applied Flow Technology (AFT) would like to welcome Softdesk Centrum Systems (CS) to their international family of Channel Partners.

Based in Lodz, Poland, Softdesk CS provides consulting services and will utilize AFT software solutions to enhance industrial engineering, infrastructure, and business.

Softdesk CS partnered with AFT because of their strong international recognition to quickly and accurately execute flow analysis models as well as mitigate waterhammer / surge issues. While the two companies have known each other for several years, they formed a mutual understanding while attending the ASME PVP conference where AFT President, Trey Walters, P.E., presented several papers on waterhammer / surge.

Softdesk CS appreciates the strong partnership tools AFT can provide their clients. Since 1997, they have provided modern business resources so engineers can confidently work with the most advanced tools to meet project needs. Additionally, Softdesk CS designs industrial piping and performs other specialty services. They work hand-in-hand with major operators of industrial and design companies to pay special attention to issues such as dynamic pulse pressure, vibration and other typical and atypical phenomena in plants.

One of their main priorities is the reduction of pulsation of pressure and mechanical vibrations and accompanying negative environmental effects (noise and other effects vibroacoustic, energy losses, etc.) in installations for extracting, processing and transporting fluids using anti-pumping bottles and other proprietary solutions.

To speak with Softdesk CS or for more information, call +48 509 703 110 or email This email address is being protected from spambots. You need JavaScript enabled to view it..



Top 10 Features to Look For in a Flow Analysis Software

COLORADO SPRINGS, Colo., USA, December 5, 2018 -- If you or your kids are gamers, chances are you have a serious preference on the console you think is best. Right now it’s a fierce rivalry between PlayStation and Xbox with Switch coming in a strong third (or for some it’s first). Either way, they perform differently, have different games, different graphics, and different price tags.

Just like you wouldn’t make an impulsive console purchase, you wouldn’t make a hasty hydraulic flow software purchase. After all, it is a big investment and it’s a tool you will most likely use for a very long time. And just like consoles, there are a few top runner hydraulic flow analysis software companies.

You might think they sound similar and can do the same thing right? Completely wrong. Each offers different features and each has its own level of usability. Many companies have an impressive list of features, but they may not work as expected. That’s why it’s important to take the time to test drive the software.

So how do you decide which hydraulic flow analysis tool is the right tool for you?

How to Evaluate Before Purchasing

First Step: Request a Live Demonstration: Most hydraulic flow companies have a small demo on their website like AFT does. However, it is important to know that this limited demo will absolutely NOT show you what you are looking for. I can’t speak for all companies, but AFT software has so many features and capabilities that it is 100% impossible to throw a demo at an engineer and expect them to automatically understand how to use it.

Therefore, it’s highly recommended that your first step be a live demo where the company can show you the features. This time also gives you the opportunity to dive in and really ask questions on how the software can meet your project needs.

Second Step: Utilize a Free Evaluation License: If you take this step, it’s a really big step. This means you are committing to installing a full version of the software and allocating a few hours to testing it out. AFT provides customers sample files they can play with. But take full advantage of this opportunity! Upload your own neutral file, .pcf files, EPANET files or excel data to kickstart models. Test the add-on modules and run your scenarios. Use pump sizing features and compare your data to other software models and even your hand calculations. This is your time to truly evaluate the features and the usability.

Third Step: How to Communicate the Budget: For many companies, the engineer testing the software needs to communicate with others prior to a purchase. This is the step where you will bring all the players into one room and have a final call with your software consultant. You can explain what you like about it, how you can use it, and your consultant will give a broader demonstration to show extended capabilities and will explain the efficiency benefits – both for man-hours and project accuracy.

What to Look For in a Hydraulic Flow Software

While you are taking the vital steps to evaluate a software, you should keep your end-goals in mind and really think about the features you will need to complete projects you work on. If there are specific features you need, like GIS importing, be sure to compare your prospective products to see how that specific feature works in both software products and evaluate the results it gives you.

Below are the top 10 features AFT encourages our customers to look at:

  1. Multiple Levels of Software Calculation Validation
    • This can include model comparisons to published examples, an official quality assurance program such as one that adheres to ASME NQA-1 standards for use in safety-related systems in the nuclear industry, and plenty of case studies.
  2. Scenario Management
    • An ability to model any variety of cases within a single model file where you can change any input parameter or fluid properties to determine their effect on results. A “family-tree” like scenario structure is very effective where changes in parent cases should automatically update dependent child cases.
  3. Global Editing
    • Efficiency is important. The ability to massively edit multiple pieces of information at the same time is key.
  4. Excel Integration
    • Importing model changes to multiple scenarios simultaneously makes updating different cases with data variances incredibly effective. Sending specific model output results to a spreadsheet format in an automated fashion leads to significant flexibility when carrying out other calculations.
  5. Design Alerts for Maintaining Code Compliance
    • Quickly bring attention to when important parameters are outside their maximum or minimum allowable boundaries.
  6. Heat Transfer
    • Full piping heat transfer calculations should be included to handle convection, buried pipes, layers of insulation, and the ability to calculate external heat transfer coefficients based upon ambient temperatures and wind speeds. Heat transfer through heat exchangers is necessary as is the ability to perform the proper energy balances to determine the mixture temperature when two different streams mix together.
  7. Goal Seeking and Transient Modeling
    • Goal seeking saves great amounts of time by automatically changing multiple input parameters to provide you the results you want. This also aids with model calibration to measured data.
    • Transient modeling is important to consider because systems rarely stay the same over time and it is necessary to determine the overall dynamics of a system and how multiple components interact with each other as things change. Simply running multiple cases as a series of steady-state runs would be cause for missing potentially important or problematic intermediate results.
  8. Non-Newtonian and Slurry Modeling
    • A quality flow analysis software should be able to handle not only a wide variety of fluids other than water but should have the ability to handle other types of behavior such as paper stocks, Power Law fluids, Bingham Plastics, or settling slurries.
  9. System Cost Analysis
    • Accounting for the material, installation, maintenance, and energy costs for an entire piping system in an easy-to-read cost report can be just as important as determining the system flow, pressure, and temperature distributions.
  10. Waterhammer Analysis
    • Waterhammer situations can lead to disastrous effects upon sudden pressure surges. A quality flow analysis software should have the ability to determine the system pressure response due to various causes like pump trips, valve closures, pump starts, and include the ability to use surge suppression equipment as well.


If you would like to look further into any of the above features, contact AFT at This email address is being protected from spambots. You need JavaScript enabled to view it. or call (719) 686-1000. We look forward to meeting you. 



AFT Impulse 7 – Visualize More for Faster Solutions

AFT Impulse 7 available for waterhammer and surge

Applied Flow Technology Releases New Version of Their Waterhammer and Surge Analysis Software

Bordeaux, France - November 14, 2018 – Applied Flow Technology President, Trey Walters, P.E., announced the release of AFT Impulse™ 7 to help engineers visualize more at the prestigious Pressure Surge Conference in Bordeaux, France where AFT joins top authorities to discuss global advancements on waterhammer and surge.

Quickly approaching its 25th anniversary, Applied Flow Technology (AFT) has significantly advanced the powerful interface of AFT Impulse 7. While dedicated users still have access to the features which have made AFT Impulse an industry leading software, AFT has invested a great deal into making AFT Impulse 7 a stronger and more advanced tool; a tool mechanical engineers around the world use to design safe and dependable piping systems.

 “Our new version 7 of AFT Impulse clearly demonstrates AFT’s commitment to the global waterhammer engineering community and improving safety in design and operation of piping systems,” said Walters. “We listened to engineers and looked at industry trends. We have made many user interface enhancements to better support both new and experienced users, as well as added several new file import and export formats to make it easier than ever to get existing data into and out of AFT Impulse.”

 In total there are almost 50 new and enhanced features in AFT Impulse 7.

 Here are the top 7 features you will not want to miss out on:

  1. Model efficiently with layout import from file formats supported by CAESAR II®, SmartPlant®, CADWorx® and AutoCAD Plant 3D, and import / export EPANET
  2. Create models using an isometric grid
  3. Utilize color animation to visualize parameter changes over time
  4. Improved user interface for defining centrifugal and positive displacement pump data in the Pump Property window using automatic periodic PD pump flow calculation
  5. Extensive new Excel capabilities including the ability to export output using the new Excel Export Manager and even complete your exports while running batch scenarios
  6. Calculate buried pipe wave speed
  7. Ability to model Pumps as Turbines (PAT)

 Find the complete list of new features and information about AFT Impulse at: www.aft.com/products/impulse/details


Import Piping Layouts

Throughout 2018, AFT has released new versions of all of their primary products including AFT Fathom 10, AFT Arrow 7, and now AFT Impulse 7. These releases have each incorporated advanced features with a primary focus of integrated import / export partnerships between software files. All AFT applications allow users to import piping layouts from CAESAR II® Neutral files. The CII Neutral file is a de facto standard in many sectors of industry. You can also import Piping Component Files (*.pcf). This format is supported by SmartPlant®CADWorx® and AutoCAD Plant 3D, among others. All of this is in addition to the previous capability to import GIS shape files.

In the water industry, a common file format is EPANET.  AFT applications will import and export EPANET files.


Software Extension Tools

AFT users will tell you the software is great on its own; but when they add-on a module, the software becomes a tool that surpasses their expectation of what AFT software can do.

AFT Impulse has two add-on module options: Settling Slurry Module and the Pulsation Frequency Analysis Module.

 Settling Slurry (SSL) Module is the only commercial software solution that can model both non-settling and settling slurry waterhammer effects. With this tool, engineers can predict slurry wavespeed and keep a wide range of slurry data in a sharable database. Users can specify if it is a basic water slurry which uses water as the carrier fluid and treats all pipes as isothermal; or an advanced slurry that uses any fluid as the carrier fluid, allows slurry properties to vary among pipes, and allows heat transfer and system energy balance calculation. Engineers even have their choice of calculation methods: minimal, simplified, or detailed.

 AFT entered into the pulsation realm with the Pulsation Frequency Analysis (PFA) Module. Why? Because pulsation issues are difficult to diagnose and can cause significant operational problems. Mitigation of pulsation issues can lead to a large amount of wasted productivity in terms of both employee time and lower product delivery. AFT developed the PFA Module so engineers can keep pulsation identification and mitigation in-house and quickly evaluate possible solutions better than ever before. All of this while ensuring compliance with API 674!


AFT Impulse Product Quick Facts:

AFT Impulse is a powerful dynamic simulation and analysis tool used to calculate pressure surge transients in liquid piping systems caused by waterhammer. 

  • Easily model a wide range of system components and surge devices
  • Understand the transient response of your system, knowing how valves, pumps and other components will dynamically interact with each other.
  • Evaluate the effect of pressure surges due to vapor cavity collapse by modeling vapor cavitation and liquid column separation.
  • Validate the design of safety features to produce safer, more economical pipe systems.


About Applied Flow Technology

About to celebrate their 25th anniversary, Applied Flow Technology is a leader in the pipe flow modeling software market. With a primary focus on developing high-quality fluid flow analysis software, AFT has a comprehensive line of products for the analysis and design of piping and ducting systems.

With channel partners around the world and customers in more than 80 countries, AFT software has helped companies in many industries design safer, more efficient systems and solve operational problems.

Located in Colorado Springs, Colorado, USA, our professional staff consists of engineers with extensive experience in both the design and construction of piping systems and the development of analytical modeling methods.

View the extended details of AFT Impulse at: http://www.aft.com/products/impulse/details