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= 54 x 106 + 69.3&)2 + 30.8«2 - 30 x 106 = 24 x 106 + 100.la/

But since the maximum hoop stress at the inside radius is limited to 240 MN/m2, from eqn. (4.8)

fi , (0.54 x 106+ 0.693«2) 1.9 , 240 x 106 = (24 x 106 + 100.let.2) + --^----x 7470 x O.Olcn2

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