PVC Pipe and Fittings Library: Difference between revisions

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This is a library of all the current PVC Pipe and Fittings that have been made in freecad for OSE. Many fittings can be created using [[#OSE Piping Workbench]].
This is a library of all the current PVC Pipe and Fittings that have been made in freecad for OSE. Many fittings can be created using [[#OSE Piping Workbench]].


=Pipes=
= Pipe dimensions used in literature =
 
The dimensions of the PVC pipes can be found here [[PVC_Pipe]].
Wikipedia on Nominal Pipe Size (NPS) [https://en.wikipedia.org/wiki/Nominal_Pipe_Size],
 
A pipe is described by its outer diameter '''OD''', its wall thickness '''Thk''' and its height<ref>We use height instead of length  in order to make a pipe similar to a FreeCAD cylinder. These particular choice of pipe dimensions make it more compatible with pipes from flamingo workbench.</ref> H.
 
[[File:pipe-dimensions.png]]
 
=== Workbench ===
 
To create a pipe, click [[File:CreatePipe.svg]] in OSE piping workbench.
Adjust CSV '''pipe.csv''' in ''tables'' directory within workbench directory to add new pipe dimensions to the list.
 
[[File:create-pipe-screenshot.png|thumb]]
[[File:create-pipe-cad-screenshot.png|thumb]]
 
== Notations used by others ==
* O.D. - outer diameter.
* O.D. - outer diameter.
* Average I.D. - average inner diameter (why average?). This dimension determines the size of the pipe.  
* Average I.D. - average inner diameter (why average?). This dimension determines the size of the pipe.  
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* Schedule - determines (indirectly) the thickness of the wall.
* Schedule - determines (indirectly) the thickness of the wall.


=Elbows=
Useful links: [https://www.aetnaplastics.com/site_media/media/attachments/aetna_product_aetnaproduct/204/PVC%20Sch%2040%20Fittings%20Dimensions.pdf]
== Elbows ==
An elbow is described by an angle alpha, outer pipe diameter POD, inner pipe diameter PID, H, J, M.
[[File:elbow-dimensions.png]]
=== Workbench ===
To create an elbow, click [[File:CreateElbow.svg]] in OSE piping workbench.
To add new elbows, adjust '''elbow.csv''' in ''tables'' directory within workbench directory.
[[File:create-elbow-screenshot.png|thumb]]
[[File:create-elbow-cad-screenshot.png|thumb]]
= Couplings =
A (general) coupling is described by dimensions: POD, POD1, PID, PID1, L, M, M1, N. The dimensions POD1 and PID1 are not from a official specifications.
They are derived from pipe size and schedule. In a reducer coupling, the pipe dimensions on one side POD and PID differ from on the other side POD1 and PID1.
[[File:coupling-dimensions.png]]
=== Workbench ===
To create a coupling, click [[File:CreateCoupling.svg]] in OSE piping workbench.
To add a new coupling to the part list, adjust '''coupling.csv''' in ''tables'' directory within workbench directory.
[[File:create-coupling-screenshot.png|thumb]]
[[File:create-coupling-cad-screenshot.png|thumb]]
= Bushings =
Important: There was a bug in workbench with version until 03. March 2018, where PID was used instead of POD.
A bushing is described by dimensions N, L and pipe dimensions. As pipe dimensions we use POD, PID1, and POD1.
[[File:bushing-dimensions.png]]
=== Workbench ===
'''Important''': There was a bug in workbench with version until 03. March 2018, where PID was used instead of POD.
To create a bushing, click [[File:CreateBushing.svg]] in OSE piping workbench.
To add a new coupling to the part list, adjust '''bushing.csv''' in ''tables'' directory within workbench directory.
[[File:create-bushing-screenshot.png|thumb]]
[[File:create-bushing-cad-screenshot.png|thumb]]
=Tees=
== Almost General Tees  ==
A tee is described by parameters G, G1, G2, H, H1, H2, M, M1, and pipe dimensions. As pipe dimensions we use POD, POD1, PID, and PID1.
[[File:tee-dimensions.png]]
=== Workbench ===
To create a tee click [[File:CreateTee.svg]] in OSE piping workbench.
To add a new tee to the part list, adjust '''tee.csv''' in ''tables'' directory within workbench directory.
[[File:create-tee-screenshot.png|thumb]]
[[File:create-tee-cad-screenshot.png|thumb]]


= Cross =
= Cross =
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[[File:cross-dimensions.png]]
[[File:cross-dimensions.png]]
=== Workbench ===
To create a tee click [[File:CreateCross.svg]] in OSE piping workbench.
To add a new cross to the part list, adjust '''cross.csv''' in ''tables'' directory within workbench directory.
[[File:create-cross-screenshot.png|thumb]]
[[File:create-cross-cad-screenshot.png|thumb]]
= Corners =
An corner is described by dimensions G, H, M and pipe dimensions. As pipe dimensions we use POD and PID.
[[File:outer-corner-dimensions.png]]
=== Workbench ===
To create a corner, click [[File:CreateCorner.svg]] in OSE piping workbench.
To add a new corner to the part list, adjust '''corner.csv''' in ''tables'' directory within workbench directory.
[[File:create-corner-screenshot.png|thumb]]
[[File:create-corner-cad-screenshot.png|thumb]]


=Genaerated Library Parts=
=Genaerated Library Parts=
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[[File:OsePiningWorkbenchScreenshot.png|600px]]
[[File:OsePiningWorkbenchScreenshot.png|600px]]
== Installation ==
In a Linux system
$ mkdir ~/.FreeCAD/Mod
$ cd ~/.FreeCAD/Mod
$ git clone https://github.com/rkrenzler/ose-piping-workbench.git
[[File:check.png]] Command line instructions work on Ubuntu 16.04
Hint:For those new to Linux, always remember Linux is case sensitive.
mkdir ~/.FreeCAD/Mod creates the mod directory inside of FreeCAD. this might already exist, and that is fine.
== Remarks about the coupling code ==
To create a simple coupling or a reduced we internally use a more general coupling.
This general coupling is described by 9 dimensions: POD, PID, POD1, PID1, X1, X2, N, M, M1. The dimensions POD, PID, POD1, and PID1 are derived from the pipe sizes.
The are abbreviations of '''P'''ipe '''O'''uter '''D'''iameter and '''P'''ipe '''I'''nner '''D'''iameter.
The dimensions X1 and X2 are not official dimension names.
[[File:coupling-calculations.png]]
The offset a1 is calculated in such a way, that the thinest part of the middle section is not thinner than the walls on of the both sockets.
Lengths a2, a3, a4 and angle b1 are derived from the dimensions and are only used to calculate a1.




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*: Yes.  For high pressure applications - 300 PSI - we would have to be very careful. For low pressure, such as 5 PSI, it's not a problem. Eventually, we want to refine printing techniques where our fittings can do what standard schedule 80 ABS fittings can do.
*: Yes.  For high pressure applications - 300 PSI - we would have to be very careful. For low pressure, such as 5 PSI, it's not a problem. Eventually, we want to refine printing techniques where our fittings can do what standard schedule 80 ABS fittings can do.
** Also with things such as part baking/anealing, composite filaments, and SLA or SLS Printers, very durable parts can be made
** Also with things such as part baking/anealing, composite filaments, and SLA or SLS Printers, very durable parts can be made




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*
*




Revision as of 09:57, 30 March 2018

Basics

This is a library of all the current PVC Pipe and Fittings that have been made in freecad for OSE. Many fittings can be created using #OSE Piping Workbench.

Pipe dimensions used in literature

  • 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.


Cross

Almost General Cross

A cross is described by dimensions G, G1, G2, G3, H, H1, H2, H3, M, M1, and pipe dimensions. As pipe dimensions we use POD, POD1, PID, and PID1.

Cross-dimensions.png

Genaerated Library Parts

Library of STEP Downloads from McMaster Carr

Comparable in size to generated parts - except for some parts which are way too heavy.


OSE Piping Workbench

OsePipingWorkbenchIcon.svg


Implemented are:

  • pipe
  • coupling
  • bushing
  • elbow
  • tee
  • cross
  • outer corner

OsePiningWorkbenchScreenshot.png


FAQ

  • Do we really want to 3D-print pipe fittings? Somehow I have doubt about mechanical properties of the 3D-printed products.
    Yes. For high pressure applications - 300 PSI - we would have to be very careful. For low pressure, such as 5 PSI, it's not a problem. Eventually, we want to refine printing techniques where our fittings can do what standard schedule 80 ABS fittings can do.
    • Also with things such as part baking/anealing, composite filaments, and SLA or SLS Printers, very durable parts can be made


See Also


Useful Links

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