Composite Pipe Coupling

Designing under pressure

 

BRIEF :-
Design a coupling capable of operating
at 350bar sealing onto a Carbon / Glass Peek pipes.

Stage 1 – evaluate existing designs

Dyson-Laurence Turner_Page2_Image3
Dyson-Laurence Turner_Page2_Image1

We started by drawing up a standard steel pipe and ANSI coupling.

This gave us a model that we could later use baseline model.

It also allowed us to check that the hand calculations we did matched up with the FEA loads and safety factors.

Dyson-Laurence Turner_Page2_Image2

The initial concept was too challenging to manufacture.

It also had problems that the pre-load for a M36 bolt destroyed the composite pipe.

 

Outer Housing-Study 1-Results-Stress1
Assembly10
Render 16

By Splitting the bolts that apply the pre-load on the wedges and the bolts that connect the coupling to a standard Ansi flange we could lower the force on the composite pipe.

coupling
Picture11

The final design took over 600 bar before the pipe split.. The coupling was undamaged.

20101206 POMGlass 1010357