Question:
How does AutoPIPE Vessel perform combined loading calculations for nozzle local loads under sustained, thermal, and occasional loads?
Answer:
AutoPIPE Vessel can perform local load analysis for different load conditions: Sustained, Thermal, and Occasional.
Here’s how loads are combined during local load calculations:
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- Sustained – Sustained loads applied on the nozzle.
- Thermal – Additional loads acting on the nozzle due to thermal expansion or other temperature effects. These loads are added to sustained loads.
- Occasional – Additional loads acting on the nozzle due to exceptional conditions (e.g., wind, seismic). These loads are added to sustained and thermal loads.
Simplified Formula:
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- Sustained = Sustained Load
- Thermal = Sustained Load + Thermal Load
- Occasional = Sustained Load + Thermal Load + Occasional Load
Example Calculation:
For a nozzle with the following shear loads (FL):
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- Sustained Load = -680 daN
- Thermal Load = -800 daN
- Occasional Load = 40 daN
Calculation:
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- Sustained = -680 daN
- Thermal = -680 + (-800) = -1,480 daN
- Occasional = -680 + (-800) + 40 = -1,440 daN
The report confirms that the shear load VL = -1,440 daN, matching the combined calculation.
See Also