Each pipe support need to have the strength and flexibility to ensure the safety and quality of the pipe systems. They also need to fulfill requirements in applicable codes and standards. When calculated, all loads should be taken into consideration (e.g. operational loads, accidental loads, environmental loads).
Both the pipe support standard details and the pipe support framework must be calculated/verified.
Pipe support standard details are usually pre-calculated to their maximum capacity. These loads are then entered into the pipe support detail standard/specification as allowable loads.
Challenges:
- Correct load transfer from pipe support standard detail to the pipe support framework (correct position to use the standard detail’s max capacity)
- Local strength between the pipe support standard detail and the pipe support structural section (which may not be sufficient for the standard detail’s max capacity)
Pipe support framework are calculated individually using a structural analysis software (e.g. STAAD.Pro). Pipe supports on small bore pipes may not need an individual calculation, but need to be verified by e.g. a typical calculation.
Challenges:
- Correct boundary conditions adding support points in STAAD.Pro (Pinned, Fixed, Fixed But etc.)
- Consider local joint capacity within the framework to ensure a valid calculation.
Pipe support trunnions are usually calculated using the formulas included in «Design manual – Piping mechanical» from the M. W. Kellogg Company. Alternatively a more comprehensive FE analysis can be used. Every single trunnion should be calculated individually.
Challenges:
- Use of trunnions attached to full ring wear plates
- Use of reinforcement pads on trunnions in elbows
Other calculations that might be needed in a good pipe support design are:
- Isolation pad calculation
- Indent calculation of pipe wall
- Bolt calculations for bolted pipe supports
