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Pipe or tubing collapse pressure

Pipe or tubing collapse pressure

Pipe or tubing collapse pressure

(OP)
Hi everyone,


I am an electrical engineer currently designing a downhole survey tool. This tool could be subjected to pressures of up to 12,000 psi. The o.d. of the tool will be 1 13/16". I need to find out how much room I have inside to place my electronics package. To find this out I need a formula to calculate the collapse pressure of tubing when subjected to pressure from the outside. Most of the information I have found deals with pipe pressure ratings when internally pressured. I assume a pipe can sustain much higher pressure when pressured from the outside than the inside. I will probably use 316 stainless for its' corrosion resistance, although this is still to be decided.

Thanx in advance for your help

BGT

RE: Pipe or tubing collapse pressure

A simple formula based on pressure would be misleading. You need to combine the collapse pressure with external pressures caused by interaction with the ground. To do this correctly I would need some additional information regarding the intended usage and rigs it would be attached to.

If you do not have such information and are in the concept stage you could use a formula to get the minimum required wall thickness. The actual tool will be thicker and probably be most economical if internal structural support rings were installed. I will get back with you later with this formula. Give me your e-mail if you want me to e-mail it to you.

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