Stuck on complex pipe system bending moment hand calcs

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SUMMARY

The discussion focuses on calculating bending moments and potential failure areas in a complex pipe system involving a long horizontal pipe (L1) of 100 feet and a vertical pipe (L2) of 30 feet, both made of schedule 40 1/2" OD material. The moment of inertia is approximately 10^-8, and the components weigh around 2 kg each. The low pressure of 40 psi allows for the assumption that pressure effects can be ignored. Key concerns include assessing bending moments at fittings and the risk of buckling in the vertical pipes.

PREREQUISITES
  • Understanding of bending moment calculations in structural engineering
  • Familiarity with pipe specifications, specifically schedule 40 1/2" OD
  • Knowledge of moment of inertia and its application in structural analysis
  • Basic principles of buckling in vertical structures
NEXT STEPS
  • Research methods for calculating bending moments in pipe fittings
  • Study buckling analysis techniques for long vertical pipes
  • Explore structural reinforcement options for long pipe spans in high wind conditions
  • Learn about the implications of low-pressure gas systems on structural integrity
USEFUL FOR

Mechanical engineers, structural analysts, and anyone involved in the design and analysis of piping systems, particularly in gas applications.

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TL;DR
Not sure how to tackle this indeterminate pipe problem. I'm interested in any of the failures (maybe bending moment at the fitting or buckling at the long lines).
pipeproblem.jpg


Some more details on the system are that L1 is very long (close to 100ft) and L2 is close to 30ft (the vertical pipes). The piping is all schedule 40 1/2" OD. Moment of inertia is roughly 10^-8. Components are about 2kg each. The distance of the pipes horizontally is small (around 2ft). Pressure is low and it's a gas so I think we can ignore that (40ish psi). Want to see how I can calc what the possible failure areas are. Stuff like bending moment at the fittings and buckling at the long vertical pipes. Thanks!
 

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Welcome!

Would you mind reviewing your description against the diagram?
If L1 is 100 feet, L2 should not be 30 feet.
It seems that you will need a structure for rigidity of those pipes in high wind conditions.
 
Of course! Seems like the 100ft line has some clamps on it higher up but at least for the initial 30ft there is no other structure. It seems to be fine? The two L1 pipes already exist I'm looking at adding the L2 pipe and tieing in.
 

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