Currently I have designed a coffee roaster that mostly uses the stainless steel tri clamps / tubes that many brewers use. The system can get up to 450 degrees F (232°C) even with moving air.
I was wondering if someone has come across a cheaper material or system than the tri clamp one? The requirements are to withstand 450 degrees F (232°C) or more, and to be food safe. Current material is stainless steel which works for food safe but the pipes with all the clamps are up to $300 or so which is more than the rest of the project.
What I have investigated so far
I looked at many plastics available and while some can handle higher heats, those are generally more expensive. I also looked at using HVAC ducting but learned that galvanized steel can let off gasses when heated up. So are the stainless steel tri clamps the best solution for the money or is there something cheaper out there that I am not thinking of?