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Jake Miller

Blast off with a revolutionary feature, Rotational Acceleration!

The success of rotating hydraulic systems could revolve around the methods employed, make sure to use only the best when modeling such a system. As the surge of space travel innovation continues, safety always comes to mind.  All too often the hazards of traveling through the colloquial final frontier prove the necessity of double checking calculations and the validity of the adage, units kill.  With the large number of piping networks that can rotate around an axis in the absence of the earth’s typical gravitational pull rotating objects involved in space flight, these systems are no exception to the hard-learned lessons...
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Jake Miller

Swing Check Valves: As Easy as Pie

What is a Pi-day without a Tips and Tricks blog? That's the $64,000 question today as you are undoubtedly preparing yourself three slices and a sliver of the delicious delicacy. Well the answer is, it's just not as great of a celebration as it could be; so today we are bringing you the scoop on modeling swing check vavles in AFT Impulse ! Last month I published a blog about hydraulic ram pumps and how they work along with tips to model them in Impulse. If you haven’t read that yet, go check it out here. In the blog, I mention...
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Jake Miller

Making a Difference, No Power Needed

The annual letter from Bill and Melinda Gates to Warren Buffett was released just two days before I wrote this. In 2006, Warren Buffett made what will surely be the largest philanthropic donation by a single person in the foreseeable future. This helped to cause the resources available to the Bill & Melinda Gates Foundation to explode overnight. So in commemoration and in gratitude they write an annual letter addressed to Warren. In their most recent annual letter , the foundation celebrates helping over 122 million children survive in the past 25 years due to their amazing efforts with the help...
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Dave Miller

Tolerable Convergence

Trying to design and analyze piping systems can be a complicated, and difficult task for engineers. This was especially true before the advent of easily accessible computer technology. Hand calculations required hundreds of hours of painstaking work, by entire teams of people. Great care had to be taken to ensure the reliability and accuracy of the results. Human beings do make mistakes, after all.

In today’s engineering world, there are a multitude of computer tools designed to make the design process simpler, faster, and more reliable, such as AFT’s family of analysis products. AFT products revolve around graphically based, drag and drop interfaces that makes creating a computer model of piping systems quick, and easy. Being able to create simulation models with little effort, however, can be a bit of a double-edged sword.

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Erin Onat

Give me some details about Detailed Tees!

Frequently in tech support, when a difficult-to-converge model comes in, one of the first things we check is whether or not any tees in the model are being modeled as detailed tees. The reason for this is that the hydraulic calculations involving detailed tees can be complex due to the interdependence between velocity and pressure loss for each pipe connected to the tee. Iteration must, therefore, be performed to find a pressure loss and flow through each connecting pipe that agrees with the rest of the flow and pressure solutions in the model. This begs the question, then, what calculations are...
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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 that...
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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 pump...
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