1. I am in the process of analysing large diameter pipe (1800Dia), the temperature is 270 deg. C, the pipe is getting lift off at the changes in vertical direction, i know it is unavoidable, the allowable span for support is 20Metre, but it's taking 33M to sit in the structure, code stress are passed even at the 33M support.

2. For large diametre pipe, what is the maximum displacement allowed ?

Kindly advice me for my above clarifications.