In a high Pressure, high temprature pipe we provide loop 2d/3d for flexibilty & thermal expansion. How to calculate Loop dimensions & at what interval of pipe lenght we should provide the loop.
(piping stress design is not as easy as it "appears" - I suggest readind a couple of books if you were really interested - the first one being "Introduction to Pipe Stress
Analysis" by Sam Kannappan)
If you would like more book recommendations - please ask.