Minimum Manway Size
Minimum Manway Size
(OP)
Does anyone know of a required size of a manway on a hydro-tank? A requirement by OSHA or ASME or anyone? I can't seem to find one anywhere.
I know you can't go too small, but I'm trying to justify (other than good sense) why we should use a larger standard manway for our tanks.
Thanks
I know you can't go too small, but I'm trying to justify (other than good sense) why we should use a larger standard manway for our tanks.
Thanks





RE: Minimum Manway Size
For ASME VIII Div. 1 vessel, refer to UG-46.
For ASME VIII Div. 2 vessel, refer to AD-1020.
RE: Minimum Manway Size
A worker with necessary safety gear needs to be able to get in and out for painting operations, and that would set the minimum size.
RE: Minimum Manway Size
Also Woodson's "Human Factors Design Handbook"
RE: Minimum Manway Size
I like a nice "large" one....was inside a mud drum once with a guy who panicked stuck in the only manway out. By the time we got his coveralls and belt removed,two guys pulling outside and me pushing inside,none of us were real happy.
RE: Minimum Manway Size
RE: Minimum Manway Size
At the risk of starting a thread tangent, I've gotta ask...why would OSHA think women workers need larger manways? I can only imagine the spectrum of repsonses people could offer.
RE: Minimum Manway Size
RE: Minimum Manway Size
RE: Minimum Manway Size
RE: Minimum Manway Size
If you got in through the manway, shouldn't you be able to get out through the same sized opening?
[unless maybe it's a vat of beer or a tank of doughnuts
RE: Minimum Manway Size
RE: Minimum Manway Size
S. Bush
www.water-eg.com
RE: Minimum Manway Size
Just remember that management will want you to go through anything that you can get your head and one arm through.
The newer 17" oval manways for boilers are 100% better than the 16".
We require a 24" manway in all our vessels for safety reasons. The biggest concern is getting a stretcher or back board through the manway.
Case in point.
This requirement just paid for itself in spades during a recent turnaround where a contract employee had entered a 40' high reactor through a top 24" manway and as he got to the bottom he slipped on the bottom head and impelled himself on a thermowell that penetrated the bottom head. If it hadn't been a 24" manway the only other was out was by removing a 24" over flow line which would have required several hours of work.
RE: Minimum Manway Size
Cheers
RE: Minimum Manway Size
As far as I know, the local cities still call a manhole just that.
RE: Minimum Manway Size