Why is it that when I calculate bolt loads for seating and operating conditions, my seating bolt load comes out significantly higher than my operating condition? Is this the load I would use to specify installation torque? Seems awfully high. For instance, a 30" R.F. manway cover with rubber gasket gives a bolt load of ~98,000 lb. (100 psi internal pressure) for my operating condition but ~380,000 lb. for my seating condition. Refer to Section 2-5(e). Seating load seems to account for actual bolt areas whereas operating load only accounts for required bolt areas. Totally confused!
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