What is the Minimum Flange Thickness?

The information given is inadequate. We need to know operating conditions in full to qualify our response.

ASME BPVC Section VIII - 2013 edition now available‎

Hi Anonymous
http://demos3.chempute.com/anonftp/pub/pgviiilite.pdf

WP

Does design pressure equal the 3.5 safety factor?

If you think there's an error, check your calculations. (Never hurts to check anyway.)

Point of reference - a 24" 150# blind flange is 1.875" (48mm) thick. You didn't state lots of things, design temperature, material, size, etc, etc etc. Many pressure vessels just use a blind flange.

(Anybody want to hear why we still call them manholes instead of using the proposed gender-neutral term?)

43 mm thickness can be thick or thin.

You provide us with no size of manhole. The force is 3.5 kg/mm2 times the surface it applies to. Also the thickness of your cover plate is of the same importance. I suggest you move forward with providing all the info. I have seen dwarf sized manholes up to elephant sized manholes.

banu, you have told us nothing...

A flange thickness of

If you feel that the blind on the manway will be too expensive, and the blind is to be constructed from an expensive material, consider a thin sheet of that material attached to a carbon steel ( less expensive) blind.

If your material of construction IS carbon steel, and the client wants a large luxurious 24 inch manway, consider a smaller diameter (20"). Which should be fine for most purposes

What formula did you use to design the manhole, and what diameter is it?

Hi

Why bother to use ASME VIII if you are not going to believe it? Just do your own design and go far away whilst someone else pressurises it!!!!!

Oh, come on. Everyone knows that first cost takes priority over lifetime safety. What does it matter if the vessel tears itself apart and kills someone a few times over?...

The maximum operating temperature must form part of the deliberations, surely?