I have a requirement to find the expected drop in temperature over a time scale of 1 foot piece of grade 483 42 inch XS pipe. The temperature range of concern is the time it would take for the pipe to drop from 300 F to 200 F, with an ambient temperature of 0 F, assuming no wind. Is there some reference material that someone could refer me to to calculate different scenerios for different sized pipe and wall thicknesses. Thank you.