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12" Sch 80 Pipe 1 mile underwater

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Tamaren

Tamaren

Mechanical
Joined
Sep 27, 2021
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Location
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Hello all-
New here, But I have an interesting question that I've gotten a lot of conflicting information on.

12" Sch. 80S (.5" Wall thickness) 304L Stainless steel. 24" long. Welded on both sides.
Can it withstand being 1 mile underwater (2,350 PSI external) assuming standard 1ATM inside?

Follow up questions-
A. If not, would up to two vacuum rings welded to the outside solve the problem?
B. Would matching the external pressure by depth- I.e Filling the inside of the pipe to closely match external pressure- solve the problem?
How greatly is external water temperature going to affect strength- assuming around 30F

Thanks!
 
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What do you get when you run the external pressure calculations on 12.75" OD x 0.437" wall (minimum)?
I get something just over 750psi.
Stiffeners won't help this.
You need more wall, and/or less OD.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
 
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What's the end of this cylinder?

A won't work,
B will work
Temp like that makes no difference

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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Too weak stainless steel grade, it's likely to buckle or collapse on load wave variations.
Go thicker or stronger.
Pipe-in-pipe or externally thick coated could be alternative options

* Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
 
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