PVC Pipe and Fittings Library

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Revision as of 20:16, 10 December 2017 by Ruslan (talk | contribs)
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Pipes

The dimensions of the PVC pipes can be found here PVC_Pipe. Wikipedia on Nominal Pipe Size (NPS) [1],

We will use following guide line for position of a pipe: put one end (base) of the pipe onto the x-y plane. The center of the base has coordinate (0,0,0). The other end points to the positive direction of the z-axis.

Rationale: This is the same way FreeCAD places a new cylinder. We mimic the FreeCAD behavior for UI consistancy.

The default pipe length is 1ft. This is an arbitrary choice. When I use a macro, it will store the last length used by the user.

Ellbows

Useful links: [2]

Simple general elbows

This is an intermediate solution. Here I do not follow particular NPT-Standards. Later I will translate the NPT-Parameters in these general dimensions.

To create general elbow with 6 Parameters:

  • alpha - angle of the elbow.
  • R1 - inner radius of the bending part.
  • R2 - inner radius of the elbow.
  • R3 - outer radius of the elbow parts.
  • L1 - length of one part part of the elbow.
  • L2 - length of the another part of the elbow.

I had problems to join all parts of the elbow in FreeCAD. The solution was to make the bent part a little bit smaller. Probably the problem was caused by having many common or coplanar faces of the parts. See [3].

90° - Degree.

Described by 3 dimensions: size, G,H,M. Other dimensions are derived from NPS pipe-dimensions.

Notations

  • O.D. - outer diameter.
  • Average I.D. - average inner diameter (why average?). This dimension determines the size of the pipe.
  • Min. Wall - thickness of the pipe wall.
  • Schedule - determines (indirectly) the thickness of the wall.

Notes

"O.D." = "Average I.D."+2"Min. Wall"

Gallery

Macros

Pipes

To create Pipes 40 and 80 Schedule PVC pipes File:Pvc-pipe-nps.fcmacro Pvc-pipe-nps-macro-screenshot.png

Ellbows

(Experimental) Run File:Create-elbow.fcmacro with parameters G, H and M from a table. Create-elbow-macro-screenshot.png The resulting shape is 90-deg-elbow-screenshot.png


How to create a pipe macro

Steps to create GUI: The original instruction are taken from [[4]] but I (Ruslan) have problems with them. I adjusted them to FreeCAD.

  1. Create with QT Designer a Dialog based on QDialog class. Save the name for example add-nps-pvc-pipe-dialog.ui
  2. Convert add-nps-pvc-pipe-dialog.ui to python code running
    pyside-uic add-nps-pvc-pipe-dialog.ui -o pipe-dialog.py
    or call
    pyside-uic --indent=0 add-nps-pvc-pipe-dialog.ui -o pipe-dialog.py
    to use tabs as indention.
    If you use the FreeCAD macro editor, pay attention that the indention of pyside-uic and of the editor are the same.
  3. Insert content of the methods setupUi(self, Dialog) and retranslateUi(self, Dialog) from pipe-dialog.py (How can I insert here a block of python code?) into your macro file.
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