What types of materials (valves, piping, gaskets etc.) should be used with thermal fluid systems?

Typically, thermal fluid systems should use either carbon or stainless steel components. Brass, bronze, cast iron, and aluminum are incompatible with thermal fluid. Piping should preferably be schedule 40 seamless SA 106 material. Valves should be cast steel with stainless steel trim. Gaskets should be rated for the temperature and pressure of the system. NOTE: Threaded connections larger than 1” should not be used in the flow circuit.