Considering Table 8C (CL.150) of B16.5 has a 24" slip-on flange ID, dimension B, at 24.25", I'd say 0.25" would not be an issue. Table 18C (CL.900) also has the same dimension.
A little late, but I've done lots of vessels with this type of bolting, typically called J-bolts. If you have a pull test on the J-bolt then you can do an appendix 2 calculation and the bolt circle is where the J-bolt makes contact with the flange lip. The pull force can then be converted to a...
so please point me to the specific paragraph(s) in UW/VIII-1 that I should be looking. Isn't the point of these forums to help others understand? I like learning new things, and obviously I've misunderstood this portion of the Code. I know the Code has roundabout ways of explaining things...
@r6155
Please help me understand.
by the picture you posted, a flange to hemi head is a Cat A.
Using Figure UW-3
- A hemi head to a shell circ. is Cat A
- A shell section to a shell section is Cat B.
- A nozzle pipe to another nozzle pipe (nozzle shown on the top side of the vessel) is also...
@r6155
do you have any code references or interpretations that specifically state that a hemi head to a flange is a Cat. A weld?
"see UW", "Read again UW", "Why don't you read the text and not the sketch", "See also figure UW-3 on the left, the spherical head", "see my sketch" does no good...
Why does UW-3(c) reference connecting flanges to formed heads, and per UG-32, hemispherical heads are considered formed.
UW-3(a) says any welded joint within a formed head is Cat A, and specifically states circ joints to the main shell, transitions in diameters , nozzles or communicating...
If you use UG-27 (inside radius based calculation), 'R' should be based on the inside corroded thickness, then add the outside corrosion allowance to your calculated 't'
"Facing thickness greater than 1/16" shall be in excess of the required minimum flange thickness".
flange required thickness = 2.1875"
raised face thickness = 0.25"
total thickness = 2.4375"
If you calculate the opening as a diameter that includes the tapped holes you will be fine, then use UG-43(d) and (g) for the tapped hole depth (as others have said).
