Carbon steel pipe failure

[txcadman]

We have an application with a water seal that has a 1/4" thick x 40" diameter pipe supporting a large pipe 64" cap and 64" pipe segment to form a water seal. I suspect the 64" cap and 64" pipe segment is vibrating/moving on top of the 40" pipe due to flow and there was a failure of the 40" pipe. The attached photos shows the failure of the 40" pipe. Is the jagged nature of this failure indicative of a back and forth motion which produces this jagged torn appearance? The "top hat" or pipe cap assembly was torn from the 40" pipe. I am more interested as to the mechanism of this failure type (jagged torn appearance).

 

A professional failure analyst at a metallurgist laboratory should be able to help. Crowd sourcing the interweb, not so much. But remember, you get what you pay for.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[EdStainless]

Ironic, You don't always get what you pay for, but you never get more than you pay for.

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P.E. Metallurgy, consulting work welcomed

 

[MJCronin]

Agreed ..... This looks big and expensive enough to call in a corrosion/materials pro

MJCronin
Sr. Process Engineer

 

[LittleInch]

Can you draw this up?

What are all those strange lines / striations?

Looks like brittle failure of some sort, but not really a lot of data here.

"Carbon Steel" is far too vague.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[mrfailure]

Got my suspicions, but everyone is right that you need an actual failure analysis performed at a lab. I wonder how thick was the fracture compared with the general pipe thickness?

 

[Dhurjati Sen]

The 6.35 mm thick pipe / plate has seems to have become paper thin!

More details are required for crowd-sourcing failure analysis.

If you are really keen, you would know what details and drawings you need to provide us to help you for free.

DHURJATI SEN
Kolkata, India

 

[TugboatEng]

1/4 inch wall and 40 inch diameter? Was this supposed to be filled with concrete?

 

More details are required for crowd-sourcing failure analysis.

As much as I appreciate the quality of your contributions, 'crowd-sourcing failure analysis' is a 110 decibel contradiction in terms.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[LittleInch]

This OP asks questions then dissappears, without even bothering to log in, far less answer any questions or provide more information.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Dhurjati Sen]

Dear ironic metallurgist,

It was just a ploy to get some details from OP. However, it failed miserably as in most cases.

The rest has been pointed out by LittleInch.

Best regards.



DHURJATI SEN
Kolkata, India

 

DS,

Understand, but exactly not my point.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."