Pad-Type Flange - Calculation of Bolt Size

This is an ideal query for the Engineer/Inspector from the company that supplies burst indemnity insurance for the vessel. A simple telephone call in the first instance is all that is needed. That individual will have a copy of the as-built drawing of the vessel to hand, as that is the equipment that is being inspected periodically and insured on a continuous basis.

Bear in mind that if the vessel is any different from that drawing, then in the event of an incident, it is the job of the Loss Adjuster to adjust the insurance company's losses, ideally towards zero, on the basis that what went BANG is not what was insured.

Presumably it does pass periodic inspection and testing for insurance purposes?

Try the engineering forum devoted specifically to these types of questions:

www.eng-tips dot com

I don't know anything about the applicable codes. Whatever the flange is for (a pipe maybe) will limit the bolt size by the clearance to this object and the XF dimension of the bolt or nut; if no nut because the flange is threaded, don't forget the strength of the threads in the flange. With the pressure and size you can calculate the load then apply the safety factor. In addition there is something called "prying," which I know exists, but don't know how to deal with.