8.681 ID casing string rated for 437,000 lbf tension. 46% of the casing’s tension rating is applied. What is the maximum pumping pressure before the casing exceeds the tension rating?
Turn to 6 DTC 1 (casing, stress are the key words).
Find remaining tension allowed: (437,000)0.54 = 236,000 lbf
Find allowed pressure using 236,000 lbf = P(0.7854)D^2 lbf, or:
P = 3987 psi. (A)
This is a 3 minute problem if you know what you are doing. And it's realistic. And it's in TS 2. Know how to do problems like this quickly.
Hello Dave, if you have Ften = sigma yield * As, i get 17388 psi (236000 lbf / 13.572 in2). Any help on how you get to 3987 psi? Thanks.
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