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Trey Walters

Get the Salt Out! California, Israel, the World...and Desalination Technology

In February I reached a new low. Up until that point, my lowest point happened as a child in my home state of California. That was when my father took me through Death Valley - elevation 282 ft (86 m) below sea level.

But this was different. I was not going to the lowest spot in North or South America (Death Valley). I was going to the lowest spot in the entire world. I was on my way to the Dead Sea. Located on the border between Israel and Jordan (see my personal photos below), the Dead Sea is at an elevation of 1412 ft (431 m) below sea level - and getting lower all the time as it further evaporates.

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Trey Walters
Hi Manuel - I am far from a desalination expert. When it comes to the California coast, I have a hard time seeing the discharged b... Read More
Sunday, 15 October 2017 15:11
Trey Walters
Here is another link https://www.watercorporation.com.au/home/faqs/water-supply-and-services/what-happens-to-the-salt-from-seawate... Read More
Sunday, 15 October 2017 15:12
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Trey Walters

Hang on when riding a banshee on an alien world!

Technology has sure come a long, long way. As I am sure all of you know, Disney has been a technology innovator in the entertainment industry for nearly a century. The gee-whiz things Disney does has helped inspire many like myself to pursue technology careers.

Once again Disney has used technology to create a "Wow!" experience. I am talking about the new Flight of Passage ride at Disney World in Florida. I visited there a few weeks ago on opening weekend of the new Pandora - World of Avatar land at Disney's Animal Kingdom park. The new land and this ride in particular are based on the top grossing movie of all time - Avatar. This new ride ("attraction" in Disney parlance) is unlike anything I have ever experienced. I got to ride it twice on this trip. This ride simulates a wild ride on the back of flying banshee like those found in the Avatar movie. The Na'vi word for the banshee is Ikran.

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Jake Miller

Calculating Pressure Drop Across Sharp-Edged Perforated Plates

Sometimes design engineers will install a screen to protect equipment like centrifugal pumps. Screens are available in a variety of configurations and each has its own head loss characteristics. As such, this article will strictly discuss thin-walled perforated plates with uniform diameter holes. AFT Fathom provides a screen junction that allows users to choose from four different screen types; Perforated Plate (Sharp-Edged), Perforated Plate (Round-Edged), Circular Wire, and Silk Thread Screen. Every screen has an open flow area that allows the working fluid to bypass the screen while restricting any foreign objects that are not able to pass through this area....
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Aaron Ren
This article is very good! I got much things from your articles. I think it is much better if you can add a tool in AFT Fathom t... Read More
Wednesday, 27 December 2017 08:44
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Jake Miller

Thank Your Machinist for Me

Cutting through the mysteries of impeller trimming Centrifugal pumps are a common and integral part of many industrial applications related to fluid flow of any kind. They require significant amounts of energy to operate. Unfortunately, many pumps are oversized for their applications. When pumps are not properly sized this can lead to operational difficulties that must be addressed. A pragmatic solution to this problem may be to reduce the outer diameter of the pump impeller to better meet flow requirements and avoid costly operating procedures such as throttling or expensive replacements. Changing the impeller diameter will affect the performance of the...
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Reinaldo Pinto

AFT Now Offering FREE Hydraulic Workshops Around the Globe

Originating in Colombia at the start of 2017, AFT began offering free 1-day workshops combined with scheduled customer visits.

During these workshops, attendees get hands-on experience with AFT software as well as the opportunity to discuss relevant hydraulic topics. Attendees also receive a 15-day free trial license to review topics discussed in the workshop.

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Erin Onat

Inherent vs. Installed Control Valve Curves and How They Relate to AFT Software

As tech support engineers, we sometimes receive questions from users confused about what control valve characteristic curve (inherent or installed) they are inputting into AFT Fathom , AFT Arrow , or AFT Impulse . The inherent control valve characteristic curve plots the valve open percent versus the percent of maximum Cv. This curve is true regardless of the system effects on the valve. The installed control valve characteristic curve plots the valve open percent versus the flow through the valve, and this plot is dependent on the conditions specific to the system. For example, if the control valve flow setpoint is...
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Trey Walters

All the Sexy Aerospace Stuff That is Happening

It was sometime around 1988 and it was pitch dark outside. I and some of my aerospace colleagues from work were driving in a car caravan from San Diego to Edwards Air Force Base at the ungodly hour of 3AM. The Space Shuttle Discovery was scheduled to land that morning and we wanted to see it.

From the moment I woke up in the middle of the night and all the way through the drive to Edwards AFB to the parking and walk to the viewing area to the standing in the cool, early morning air for a couple hours, I was questioning whether the whole effort was worth it. The landing of Discovery was not even certain. Weather conditions could postpone the whole thing.

And then someone pointed at the sky and yelled "There she is!". And I saw her too. Then a minute later we all heard the distinct double sonic boom. And I instantly knew it had been worth it.

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