Plastic Vessels

For such a specialist and technical function, contact the palstic suppliers directly, then get their assistance to find a suitable manufacturer.

Try GE Plastics or DUPONT as first choices. Not that they are better than the others, but they have good international "help desks" for such applications from "beginners" and can provide technical support for initial designs.

From your desription, it sounds like you are trying to replace "sight glasses" in your lines.

You might also try contact through the compressed air fitting suppliers as they make water traps and other items already rated to at least 10 bar and may already have some suitable "drop in" parts, or may be interested in developing the necessary parts for you.

many thanks for that. I'll try them both.

Polycarbonate would most likely be best, but you should really consult professionals-ESPECIALLY concerning pressure vessels! What you are considering is potentially a bomb! Seek professional help and don't put out a product without proper life cycle testing! A Coke bottle of poly will stand over 100 psi, but it is small. At the pressure and temp range you want it is even more critical.

Wrapping it with fiberglass or carbon fiber will greatly increase its survivability, but negates your see thru requirement.

Cheers Bill. It gives me something to go on.