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how to calculated manhole for drum disded head

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arstine673bfhi

Mechanical
Oct 21, 2015
1
hi,
i am trying to calculate steam drum dish head opening for manhole.
from my dish head data, according to ASME I, PG-32.1.4 & PG-32.1.5, the opening is only 3.94" diameter.
could i have a opening for 16" & without reinforce.
please someone can teach me how to calculate & according to which code.
thanks.
best regards,
Arstine

dish head data:
allowable stress: 19800psi
allowablw working pressure: 2185psi
outside diameter of vessel: 73.94" (1878mm)
thickness:3.98" (101mm)
 
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