[MW:1860] Inspection Opening on a vessel.

On a vessel of 1300 dia with a demister pad inside there is a inlet
size of 20"(a process connection) at a comfortable elevation level
below dem pad.To support my stand,can cognisance of UG46(ASME SECT
VIII Div 1) Cl f 5/f 7 be taken and avoid a 20" Manhole on a shell?On
inlet side,we intend providing a small drop-down piping spool which
can be opened when required and connection can be used as an
inspection opening.My contention is to avoid additional too much of
welding heat input associated with provision of a manhole with its
associated RF pad.
Views are invited.
Regards
Aarpee

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