[MW:1863] Re: Inspection Opening on a vessel.

20" inlet nozzle can be used as man way provided the connected piping could be cleared off for facilitating inspection . in other words the plant maintenance shall confirm it and you don't have to add any drop down spool. But for safety purpose, you need to provide Manway rungs(one at top of the opening and under side of entry till about 600 mm from landing, Note that you may find the top rung fouling with demister supports) for entry as well as to exit for the inspection personnel. Also you shall have a procedure in place for venting out any gases, certifying criteria for safe entry . 

Tagore

On Fri, Apr 3, 2009 at 3:36 AM, Aarpee <ramprasad.chari@gmail.com> wrote:

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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