Composite Pipe Coupling
Designing under pressure
Design a coupling capable of operating
at 350bar sealing onto a Carbon / Glass Peek pipes.
Stage 1 – evaluate existing designs
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.
The initial concept was too challenging to manufacture.
It also had problems that the pre-load for a M36 bolt destroyed the composite pipe.
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.
The final design took over 600 bar before the pipe split.. The coupling was undamaged.