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Q1. How is Buoyancy added in AutoPIPE?
Answer: In AutoPIPE buoyancy weight is applied in GR case. It has both longitudinal and transverse components. When the pipe is vertical, difference in pressure cap forces is the same as buoyancy load and the transverse buoyancy is zero. When the pipe is horizontal, the cap forces from external hydrostatic load adds longitudinal stress and associated movements in addition to non zero transverse (vertical) buoyancy load.
Q2. Is Pipe insulation and Cladding accounted fro in bouyancy?
Answer: Form the online help:
Clad thickness: For wind loading, hydrotest, buoyancy and wave loading, the total diameter of pipe includes the cladding thickness.
Insulation thickness: The insulation thickness is also used to calculate the surface area of the pipe for wind loads and buoyancy effects.
Q3. How do I know if Buoyancy loads are being applied to the pipe?
Answer: At this time there is no single reported value in AutoPIPE for the total Buoyancy at each node point or for the entire model.
Workaround, must have 2 identical models, where the only differency is in one model, apply Load> Buoyancy as required, and then compare the results of all the vertical support loads under GR load case. The difference between the total vertical support values between both models is the buoyancy load applied to the piping.
Remember All points with a vertical coordinate value less than the "Water surface elevation" value specified on the Load> Buoyancy dialog will be considered submerged (buoyancy load is applied). Piping above this value will be considered above water and NO buoyancy will be applied.
In addition, confirm Segment tab on the input grid, "Apply Buoyancy" column for check boxes where Buoyancy load is to be consideration for above / below "Water surface elevation" value:
Q4.
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