Have used PVC conduit in sweveral different type of plants all of which have somewhat nasty enviromental work areas. If the are large temp changes even a lot of expansion joints will not keep the install from looking bad in a couple of years. But it's a lot easier and much much cheaper than Robroy. If a customer needs robroy or other PVC coated rigid, prepare them for severe sticker shock. Also get a good count of couplings, connectors, and other hard ware. It's all expensive and an extra cost. You will need special tools to install, cut and thread it also
I also hate that stuff
