Dynamic solutions for a fluid world™

Ben is AFT's Technical Sales Consultant. He can be found teaching many of AFT's technical seminars, stopping over for lunch and learns with our customers and managing the AFT booth at trade shows. Prior to joining AFT, Ben worked as a contract engineer for Eaton Corporation and WellbornYX Corporation. He holds a Bachelor's of Science in Chemical En...gineering (2009) from Colorado School of Mines.  More
Ben Keiser

Intermediate Elevations and Splitting Pipes

Hello AFT readers! It has been quite a while since I have written a blog for you all. I had a recent discussion with a user and discovered a couple pain points that may be common. We did not have any blogs on the topics yet and I figured it was time to get back in the game and write another blog for our readers! The pain points were: 1. Modeling sy...
Continue reading
  781 Hits
  0 Comments
Ben Keiser

Liquids And Gases And Slurries, Oh My!

Tip:  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 Arrow , and about 80% of how to use AFT Impulse . ​ 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...
Continue reading
  466 Hits
  0 Comments
Ben Keiser

What Does “Head (HGL)” Mean for Submerged Pumps and Exit Pressures?

In AFT Fathom and AFT Impulse , it is possible to model a submerged pump where a short and possibly frictionless suction pipe for the pump’s inlet does not need to be modeled.  When modeling a submerged pump, there are two options available for specifying the system inlet boundary condition at the pump suction.  As shown in Figure 1 below, the Submerged Pump’s Suction Pressure can either be specified as “Head (HGL)” or “Pressure”.   Modeling a submerged pump is not the only time where the “Head (HGL)” or “Pressure” choices will arise.  If an Exit Valve (i.e., a valve...
Continue reading
  2466 Hits
  0 Comments
Ben Keiser

Know Your Pump and System Curves - Part 1

AFT Fathom can easily generate a pump and system curve for your piping system.  Creating a pump and system curve for a simple system with a single flow path and no control features is an easy and typically well-understood process.  However, as piping systems are quite complicated with lots of branch points, control features, and dynamic interactions, creating a useful system curve can quickly become a common source of confusion.  This three-part blog series is going to help clarify concepts regarding pump and system curves to better understand them.   This Part 1 blog will discuss the basics of what...
Continue reading
  13965 Hits
  3 Comments
Ben Keiser

When Should You Use Variable Pipe Resistance?

Have you ever finished running an AFT Impulse model and then received the following Warning message shown in Figure 1 and then wondered what it means? During a waterhammer analysis, the flowrates are constantly changing all throughout the system, therefore, the velocities and Reynold's numbers are also constantly changing.  The friction factors will also be constantly changing during the transient.  By default, AFT Impulse will use the friction factors that are obtained during the steady-state analysis and then use the same friction factors during the transient and they will be assumed to remain constant. Since it is possible for the...
Continue reading
  1470 Hits
  0 Comments
Ben Keiser

Putting Out Fires with AFT Fathom's NFPA Calcs & GSC

If you are performing a hydraulic analysis on your fire system, chances are high that you are working hard and maybe scratching your head in order to adhere to the NFPA codes .  The good news is that you can streamline the calculations outlined in the codes with AFT Fathom ! NFPA 15 is the standard for fixed water spray systems that are used in fire protection.  AFT Fathom has been able to perform all the standard hydraulic calculations for a fire protection analysis for a long time, including the usage of Hazen-Williams factors.  But now with AFT Fathom 9,...
Continue reading
Recent Comments
Ben Keiser
Hi Pavlo, the best thing for you to do is to update to the latest release of AFT Fathom 9 which can be downloaded here, http://www... Read More
Wednesday, 08 November 2017 17:22
  2277 Hits
  2 Comments
Ben Keiser

Using Equivalent Lengths in AFT Fathom

One of the new features in AFT Fathom 9 was the ability to model equivalent lengths instead of K factors for various types of fittings. Since AFT Fathom's existence, the standard K factor loss models have been used to quantify the pressure losses across a fitting such as an elbow, a valve, etc.  One of the reasons why the K factor method is very useful is because it is broad and applicable to a wide range of different fittings.  However, the equivalent length method is also a way that engineers will typically quantify the losses through their fittings and they...
Continue reading
  2799 Hits
  1 Comment