Stuck on complex pipe system bending moment hand calcs

In summary, the system being discussed includes two pipes, L1 and L2, with L1 being 100ft and L2 being 30ft in length. The pipes are schedule 40 1/2" OD and have a moment of inertia of roughly 10^-8. The components weigh about 2kg each and are horizontally spaced about 2ft apart. The pressure is low and can be disregarded. The goal is to calculate potential failure areas, such as bending moments and buckling, for the fittings and long vertical pipes. However, there may be a need for additional structural support for the 100ft line in high wind conditions. The L2 pipe will also need to be tied into the existing L1
  • #1
rylest
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TL;DR Summary
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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  • #2
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.
 
  • #3
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.
 

1. What is a complex pipe system bending moment hand calculation?

A complex pipe system bending moment hand calculation is a method used to determine the bending moments, or the forces that cause a pipe to bend, in a complex pipe system. This calculation takes into account various factors such as the pipe material, dimensions, and the type of support used.

2. Why is it important to perform hand calculations for bending moments in pipe systems?

Hand calculations for bending moments in pipe systems are important because they provide a more accurate understanding of the forces acting on the pipes. This information is crucial for designing and constructing a safe and efficient pipe system that can withstand the expected stresses and loads.

3. What are the steps involved in performing a hand calculation for bending moments in a complex pipe system?

The first step is to gather all the necessary information, such as the pipe dimensions, material properties, and support conditions. Next, the bending moment equations are applied to each section of the pipe system. Then, the calculated bending moments are compared to the allowable stresses for the pipe material. Finally, any necessary adjustments or reinforcements are made to ensure the pipe system can withstand the expected loads.

4. Are there any limitations to hand calculations for bending moments in pipe systems?

Hand calculations for bending moments in pipe systems have some limitations. They are based on simplified assumptions and may not accurately represent real-world conditions. Additionally, they may not account for all possible factors that can affect the bending moments, such as temperature changes or external forces. Therefore, it is important to use hand calculations in combination with other analysis methods to ensure a comprehensive understanding of the pipe system's behavior.

5. Can computer software be used instead of hand calculations for bending moments in pipe systems?

Yes, computer software can be used to perform more complex and accurate calculations for bending moments in pipe systems. However, hand calculations are still important as they provide a quick and simple way to estimate the bending moments and can be used to verify the results obtained from computer software. It is recommended to use a combination of hand calculations and computer software for a more comprehensive analysis of complex pipe systems.

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