Hi Ivan,

My first choice would be to use a rod hanger or a trapeze with two rods. After that you would not have a lot of options. If the hanger option is not possible and I had to use a sliding support I would use the plate analog to the type of pipe. Presumably at 970 degrees F you would use ASTM A-335 P22 pipe and you would have to go with the ASTM A-387 grade 22 for the support weldment. Sorry I cannot find a silver bullet for this one.

Regards, John