[PSUBS-MAILIST] hatch

[hank pronk via Personal_Submersibles]

Hi Sean,I was thinking about making a hatch from a single piece of dished material instead of the typical dome welded to a ring etc.   I have a tank head that is 7\8 thick 516-70  .  I was thinking about cutting a disk from it at the apex and simply machining a flat land with o-ring groove.  Is this a good or bad idea and would you be able to calculate the failure depth if I measure the depth of dish and dia.Hank
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