DYNASTA
1- Pipe stress analysis is performed to:
- Prevent overstress in piping and components
- Prevent joint leakage caused by excessive forces anf moments
- Prevent failure or malfunction of attached equipment caused by excessive piping loads
- Provide adequate loads for pipe support design
2- To achieve these purposes, piping systems should be adequately supported while retaining sufficient flexibility to accommodate thermal and external displacements without imposing forces and moments that will overstress the pipe, piping components or attached equipment. The analysis involves three basic steps as illustrated below:
3- To simplify the analysis process for determining the best way to reduce stresses/ reaction loads in piping systems, the problem is broken into two parts. These are :
1) reducing stresses/ reaction loads resulting from sustained loads; and
2) reducing stresses/reaction loads due to displacement loads.
The two considerations require significantly different approaches and frequently counteract each other. The general considerations for each are :
TO REDUCE STRESSES/ REACTION LOADS DUE TO SUSTAINED LOADS:
- Add supports to relieve stresses caused by weight.
- Use thicker wall pipe to reduce stresses caused by pressure.
TO REDUCE STRESSES/ REACTION LOADS DUE TO DISPLACEMENT LOADS:
- Replace rigid supports with spring hangers.
- Revise the geometry of the system to increase flexibility.
- Add expansion joints.
