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).
If there is metal to metal contact outside the bolt circle it would be an appendix Y flange. You might have to fudge the gasket location in most of the commercial software since it's located on the 'inside' of the flange hub
sorry about the delay, got crazy busy.
If you are talking about the smaller nozzles on the cone (D1 & D2 I believe), then I would figure out the developed opening size and hope it is exempt from area replacement. If not, then you could create a nozzle with the ID of the developed opening.
OR...
I would treat this similar to a pad flange, where the blue area is a reverse loose flange (or maybe a reverse integral in this case) per VIII-1 Appendix 2, then check the holes to UG-43(d) and (g). I would also do an area replacement check on the opening and limit the radius so it doesn't go...
I use R.W. Miller's method for sizing orifice plates.
Required Thickness = SQRT((0.681-0.651*β)*ΔP/Y)*D
D= diameter of pressurized area (pipe ID usually)
ΔP = pressure drop from one side to the other side of the plate
Y = plate yield stress at design temp.
β = beta ratio (orifice plate...
