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It is common practice worldwide for piping designers to route piping by considering mainly space, process and flow constraints (such as pressure drop) and other requirements arising from constructability, operability and reparability. Unfortunately, pipe stress analysis requirements are often not sufficiently considered while routing and supporting piping systems, especially in providing adequate flexibility to absorb expansion/contraction of pipes due to thermal loads. So, when “as designed” piping systems are handed-off to pipe stress engineers for detailed analysis, they soon realize that the systems are “stiff” and suggest routing changes to make the systems more flexible. The piping designers, in turn, make changes to routing and send the revised layout to the pipe stress engineers to check for compliance again.Such “back and forth” design iterations between layout and stress departments continue until a suitable layout and support scheme is arrived at, resulting in significant increase in project execution time, which, in turn, increases project costs.
Content:-
1. Introduction
2. Thermal Loads (Expansion Loads)
3. Pipe Stress Analysis: Preliminary Procedure
4. Example 1 - Using Expansion Loops
5. Example 2 - Splitting Thermal Growth
6. Example 3 - Axial Restraints to Direct Thermal Growth
7. EXAMPLE 4 - Locating Supports For Deadweight Analysis
8. EXAMPLE 5 - Making Layout Changes to Reduce Thermal Stresses
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