The Guided Cantilever Method - Part 4

The Guided Cantilever Method for Quickly Checking Piping Flexibility -- Part 4

This is a continuation of my last post. I couldn't help myself, I just had to do some coding! :-) Here in Part 4, the final part in this series, I describe a simple web application that allows you to perform a quick flexibility check using the guided cantilever method without having to memorize anything.

The web page is here. And here is a screenshot:

The expansion of the long vertical leg causes the short horizontal leg to deflect, which is modeled as a guided cantilever. The application calculates the minimum length required to guarantee the system is adequately flexible. There are a number of assumptions required, so be sure to read my previous posts here, here, and here.

To use the program, enter into the listboxes:
  • Nominal pipe size (NPS) in inches 
  • Maximum design temperature (Tmax) in degrees F
  • Length of the longer leg (the vertical leg) in feet.
And indicate the pipe material using the radio buttons, either carbon steel or stainless steel.

The minimum length of the shorter leg will be automatically calculated and displayed as shown above in red.

As covered in previous posts, these are the equations used:
L = 7.77 * sqrt(y * NPS)

// Where:
//    L = minimum length required for shorter, horizontal leg (ft)
//    NPS = nominal pipe size (in)
//    y = (Tmax - 100) * LL / 10000
//           y = thermal expansion to be absorbed (in)
//           Tmax = maximum design temperature (F)
//           LL = length of longer, vertical leg (ft)
Everything is done on the client in Javascript. So feel free to download the web page and use it however you like.

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