Manway size selection
Manway size selection
(OP)
Dear all,
I am vinoth. I am working in oil and gas field (especially pressure vessel design) and I am new in engg-tips. I have doubt in selection of manway size. For example,the vessel ID 1400 mm.shall I go to select the manway size 24inch or 20 inch. Basically which basis are followed to select the manway size. In ASME Sec VIII Div-I describes any procedure about manway size selection?.
Thanks.
I am vinoth. I am working in oil and gas field (especially pressure vessel design) and I am new in engg-tips. I have doubt in selection of manway size. For example,the vessel ID 1400 mm.shall I go to select the manway size 24inch or 20 inch. Basically which basis are followed to select the manway size. In ASME Sec VIII Div-I describes any procedure about manway size selection?.
Thanks.





RE: Manway size selection
I personally would not make it smaller than 24".
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Manway size selection
That aside, I agree with SnTMan. These days, I don't see any customers asking for 20" manways anymore unless there are special circumstances.
RE: Manway size selection
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Manway size selection
Regards
r6155
RE: Manway size selection
RE: Manway size selection
RE: Manway size selection
RE: Manway size selection
With your vessel diameter of 1400 mm, you are getting close to half of the diameter with a 24 inch manway.... my vote would be for you to use a 20 inch.
Remember, the primary reason for a pressure vessel manway is to enable access for internal visual inspection....
Inspection can be possible through multiple small inspection "hatches"... judiciously placed.
Another rarely used alternative (although very expensive) can be complete body flanges...
http://www.eng-tips.com/viewthread.cfm?qid=306431
http://www.eng-tips.com/viewthread.cfm?qid=173241
MJCronin
Sr. Process Engineer
RE: Manway size selection
Access opening is required for inspections / examinations (visual, radiographic, ultrasonic, particle magnetic, liquid penetrant, ..etc), internals replacement, weld repairs, cleaning. All above mentioned during fabrication and in-service inspections.
Regards
r6155
RE: Manway size selection
Regards
r6155
RE: Manway size selection