These are temporary forces that the system might experience during its lifecycle. External environmental factors.
A useful feature of the Fluor Piping Design Layout Training (Lesson 1: Pipe Stress) training manual is its simple stress analysis procedures specifically for layout studies
A real stress PDF contains these 5 critical sections. Here is how a Fluor designer responds to each.
: Stress Design – Sketch Procedures and Information. 000.250.9823 : Coefficient of Expansion Tables.