Pump manufacturers often supply performance curves at a specified speed. While this is useful when the pump only runs at that rated speed, performance changes when the pump has a Variable Frequency Drive (VFD). A VFD changes the shaft speed, which, in turn, changes the performance curves. If the manufacturer only supplied a curve at a sin...
The term transient cavitation is thrown around frequently when talking about the effects that transient events have on piping systems. It is widely and correctly understood to be something that can be harmful to pipes and pipe system components, but how to predict and calculate transient cavitation is not something that is as equally understood. In...
In the modern world there are many things we take for granted – especially in first-world countries. Among them are the reliable availability of water and electricity. To our homes. To our workplaces. Just about everywhere. Engineers also take things for granted. One of those is reliable data on the properties of steam and water. But it was not alw...
A few weeks ago, a major milestone was passed when AFT Impulse experienced it's Silver Jubilee - which is another word for 25th Anniversary. On November 21, 1996, AFT released the world's first visual waterhammer modeling software for Windows. This is significant for a few reasons including a reminder to me that I am getting really old! At the mome...
AFT has some good news for engineers who analyze gas transients. AFT is introducing the new AFT Arrow Extended Time Simulation (XTS) Add-on Module to help engineers better calculate compressed gas flow rate changes in piping systems. This time-based simulation software allows engineers who are designing or troubleshooting industrial ...
Getting things into orbit around the earth is hard. And expensive. The privatization trend in space technologies has been ongoing for a number of years, and new technologies are reducing costs significantly. A few weeks ago Sierra Space was joined by Blue Origin, Boeing and several other organizations in releasing details of their plan to deliver a...
New versions of AFT Fathom, AFT Arrow, and AFT Impulse are being released in the upcoming months. This round of releases focuses on major interface changes which will improve user efficiency. Check out these new features and improvements that will be in Fathom 12, Arrow 9 and Impulse 9. Analysis Setup To make the modelling process simple...
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