External pressure for underground pipe 1

[sotree]

Dear all,

I have a pipe that is buried underground 10' below from the surface. Say, the diameter of the pipe is 4' and thickness is 1". Since it is buried, the external pressure, due to soil weight or tranportations etc, around the pipe won't be uniform. Is there any pressure formula that can be used to represent the pressure distribution around the pipe?

Thanks

ST

 

[BigInch]

Yes there's ways of analysis for that problem.

If it is a 4" steel pipe with a 1" wall thickness, you've got no problems with earth pressures at 10 ft, and basically neither with any kind of vechicle that moves over it, including a 747.

Going the Big Inch!

http://virtualpipeline.spaces.msn.com

 

[sotree]

Thanks BigInch,

Unfortunately it is not made of steel. it's like a rubber (but not really rubber - more durable). And the diameter is about 4ft so that it makes a thin-wall structure. Due to its flexible nature, the external pressure is very important (Internal pressure assumes atmospheric) so I would like to know the external pressure distribution of a circular pipe.


ST

 

[SlideRuleEra]

http://www.plasticpipe.org/pdf/pubs/designmanual/Chapter 4.pdf

and

http://www.plasticpipe.org/pdf/pubs/designmanual/Chapter 5.pdf

http://www.SlideRuleEra.net

 

[BigInch]

OK, right... I see ... I need new glasses.
Your material description is still vague, so I can't give an opinion, but you really didn't want one anyway. Depending on the actual material you are using and the results of your analysis, you may want to consider installing your pipe inside another conduit, a corregated HDPE pipe for example, or a concrete pipe or other stronger material.

SlideRule you gave us some very nice links.

Going the Big Inch!

http://virtualpipeline.spaces.msn.com

 

[SlideRuleEra]

Thanks, BigInch. The Plastics Pipe Institute, where those two chapters came from, has a nice selection of downloadable publications at this link

http://www.plasticpipe.org/general/general_publications.php

http://www.SlideRuleEra.net

 

[BigInch]

No sir. Thank you.

I was changing the last digit of the x.pdf files and got to 8. Thought I got um all. Back to the vault.

I'm thinking about doing some irrigation work. There's 54 golf courses within 34 minutes of here!



Going the Big Inch!

http://virtualpipeline.spaces.msn.com