A pressure vessel is constructed with an open-ended steel cylinder of diameter 6in

, length 8in

, and wall thickness 0.375
in
. The ends are sealed with rigid end plates held by four 1/4

diameter bolts. The bolts have 18 threads per inch, and the retaining nuts have been tightened 1/4 turn beyond their just-snug point before pressure is applied. Find the internal pressure that will just cause incipient leakage from the vessel.

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