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:
- Model efficiently with layout import from file formats supported by CAESAR II®, SmartPlant®, CADWorx® and AutoCAD Plant 3D, and import / export EPANET
- Create models using an isometric grid
- Utilize color animation to visualize parameter changes over time
- Improved user interface for defining centrifugal and positive displacement pump data in the Pump Property window using automatic periodic PD pump flow calculation
- 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
- Calculate buried pipe wave speed
- 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
Applied Flow Technology's (AFT) very own Trey Walters, P.E. and Purple Mountain Technical Group's (PMTG), Dylan Witte, will join approximately one-hundred of the world's leaders in Bordeaux, France this November for the 2018 Pressure Surges Conference.
According to the BHR Group, The Pressure Surges conference series has been running since 1972, with forerunners in 1971 and 1970. It is the leading conference in the world which aims to bring together practical engineers and theoretical academics, young and old, inexperienced and specialist, from all over the world. It provides updates on the latest developments in modeling, simulating and validating pressure surges and focuses on the topics of Big Transient Data and Small Smart Sensors.
The 13th conference will embrace both traditional and novel subjects. Industrial papers will present case studies, each telling its own story. Research papers will give updates on the latest developments in modeling, simulating and validating pressure surges. Dedicated Forum papers will stimulate audience interaction with presenters and will complement other discussion and debate sessions dedicated to interactive participation.
The five papers AFT and PMTG will present showcase AFT's partnerships with world-renowned companies as well as a specialized software analysis tool used by these companies called AFT Impulse™.
Over 20 years ago when Applied Flow Technology created AFT Impulse ™, they knew it would be a leader in the tools researchers and industries around the world would use to provide advanced solutions and solve waterhammer / surge issues. AFT Impulse brings confidence to the table. It has been matched against several other pieces of software and methods. Time and time again it provides reliable analysis data and helps engineers troubleshoot events and proactively build safe piping systems.
In addition to being used and trusted by thousands of engineers who specialize in transient events, the majority of AFT products are validated and verified for nuclear engineering use. Because of this verification and validation, AFT Impulse has been utilized in nuclear plants around the world.
Applied Flow Technology will present four papers and Purple Mountain Technical Group will present one paper. Papers include:
Making the world a safer and better place – a plea for more data, validation cases and guidelines for waterhammer simulation
T W Walters, Applied Flow Technology, USA | G G Orieux, Q Li, L Thomson, Enbridge Pipelines Inc, Canada
Engineers tend to overdesign systems when uncertainty exists. Overdesign is an important part of the engineering process, but unnecessary overdesign will only increase the cost of systems without enhancing safety. An experience between a major pipeline company, their engineering design firm, and the waterhammer simulation software products used by both is described. A disagreement between software package results and ultimately the two companies developed into an issue that could significantly increase costs. More and better validation cases would have helped everyone navigate this situation more quickly, easily and inexpensively. More and better application guidelines may have helped the engineering design firm achieve higher certainty in their recommendations with potentially less overdesign.
Unappreciated challenges in applying four quadrant pump data to waterhammer simulation
T W Walters, S A Lang, D O Miller, Applied Flow Technology, USA
Part 1: Fundamentals
The transient analysis of reverse flow and rotation in pumps has evolved over the years into modern four quadrant pump waterhammer simulation. Exact characteristics for a given pump for reverse flow and/or reverse rotation are normally unavailable, and manufacturer curves are often mapped to previously published four quadrant data sets for similar pumps. Assumptions made in this mapping process can cause extreme differences in the simulation. If these assumptions are unaddressed, critically incorrect conclusions about the system’s transient behavior may be made, impacting both design and operation.
The available choices to the waterhammer analyst and the consequences of those choices are thoroughly detailed in Part 1 of this paper.
Part 2: Application Examples
Transient analysis of reverse flow and rotation in pumps requires the use of four quadrant data. This data is normally unavailable for a given pump, and existing dimensionless four quadrant data is selected based on specific speed. There are different methods for dimensionalizing the four quadrant data, which can result in significant differences in transient predictions. This study examines four examples with three exhibiting reverse flow. The two most convenient methods of dimensionalizing four quadrant data are used, and significant differences in transient predictions are demonstrated and discussed.
Surge transients due to check valve closure in a municipal water pumping station
D Lozano Solé 1, R Bosch Segarra 1, and T W Walters 2 | (1) Aquatec Proyectos para el Sector del Agua SAU (SUEZ Group), Spain | (2) Applied Flow Technology, USA
The present study highlights the importance of proper check valve selection to mitigate waterhammer and its associated problems. Two different check valves were installed in a pumping station in a municipal water transfer system: a swing check valve and a nozzle check valve. Measurements were taken of pipeline pressures after a pump trip and resulting check valve closure. The field data was compared to predictions from a model using a commercial waterhammer tool. Commonly accepted methods for estimating reverse liquid velocity at check valve closure were utilized. Results were also compared to previous experimental test from other authors. The calibrated model results matched the field data quite well. Comparisons of inferred valve characteristics to previously published results for swing and nozzle valves were not in close agreement for either tested valve.
Surge mitigation in a marine fuel oil terminal
D Witte 1; D Jackson 2; T W Walters 3 | (1) Purple Mountain Technology Group, USA | (2) Sealaska, USA | (3) Applied Flow Technology, USA
Surge modeling of complex systems such as marine fuel oil terminals requires the use of accurate computer modeling techniques to help insure the best possible response to surge events. Various surge mitigation techniques can be pursued that often require information that manufactures rarely provide and have behavior that is problematic to replicate in a computer model. This paper provides guidance with one such device, the surge relief valve, and offers a case study in how they were used in conjunction with valve stroking to mitigate significant surge events at a terminal in the gulf coast region of the United States.
Print the Pressure Surges Papers Abstract Summary