Steel pipe under high external pressure

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SUMMARY

The discussion centers on evaluating the safety of a steel pipe under high external pressure, specifically a steel tube with a yield limit of 1000 N/mm², measuring 250 mm in length, with an outside diameter of 76 mm and an inside diameter of 60 mm. The external pressure due to submersion is 69 MPa, while the internal pressure is zero. To determine safe stresses, the ASME piping code is recommended, although alternatives like Roark's may be considered. For European applications, compliance with local piping codes is mandatory.

PREREQUISITES
  • Understanding of ASME piping code for pressure calculations
  • Familiarity with Roark's formulas for stress analysis
  • Knowledge of material yield limits and pressure vessel design
  • Basic principles of structural analysis under external pressure
NEXT STEPS
  • Research ASME BPV code for external pressure calculations
  • Study Roark's formulas for pressure vessel design
  • Investigate European piping codes applicable to high-pressure applications
  • Learn about structural analysis techniques for submerged structures
USEFUL FOR

Engineers, researchers, and students involved in pressure vessel design, structural analysis, and compliance with piping codes, particularly those working with high-pressure applications in both industrial and research settings.

ptaa32
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Hi,

We have a steel tube with yield limit 1000 N/mm2.
It is 250 mm long, outside diam. is 76 mm, inside diam. is 60 mm.
It is plugged at both ends.
Inside pressure is 0 (zero) and outside pressure due to submersion is 69 Mpa.

Will this be safe?
How can I calculate what pressure that would be 'catastrophic' for the pipe?

Kind regards,

Per-Tore Aasestrand
Bergen, Norway
 
Last edited:
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Hi Per-Tore, welcome to the board. I would use the ASME piping code to determine safe stresses on externally pressurized pipe. We had a discussion on this here:
https://www.physicsforums.com/showthread.php?t=532901
If you don't have access to the ASME BPV code, you might consider using Roark's but I always use the ASME code for this and am not familiar with how Roark's does this and I've left my copy at the office.

Edit: I'm sure there's a piping code in Europe which is equivalent to the ASME code in the US. If this is an industrial application, you will be required by law to perform the structural analysis per the applicable European code.
 
Last edited:
Hi,

Thanks for the tip.
It is for a research project, so there is no need for code compliance.
The cylinder will contain some instrumentation, and I only need to know if it will survive the depth. Preferably also what the margins are.
 
Casing Pipe 139.7*9.17 , mark C-75

Who can find this casing pipe ?
 

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