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We're designing a pressure vessel with large (1700mm/66in) stub end nozzles. Normally for the stub nozzle we hydro with a flat plate since our pressures are usually very low (1bar/15psi). For the job I'm working on we have 3.6bar (54psi) and a flat plate won't cut it. Does anyone know if you can...

I am analyzing a piping system using AutoPIPE and can not figure out if the software calculates the static head of the system. Basically, should I set the pressure to be the design pressure at the highest point of the system or the lowest?

It's possible that the original model was using the stiffness of the vessel's support beam for the spring rate. The problem with this approach is that it ignores friction. If there aren't springs in use, I would change the support from a spring to a +Y with friction. If you need to go with...

Alloy 20 is SB-729 N08020, Caesar material 394. S32615 is an unlisted material so that's a bit trickier but you may need to add it to your material library.

Thanks! I tried to find it too many times and just kept overlooking it.

There are two caldding cases to consider with Section IX, (1) if the clad is included in the design calc or (2) if not. If you are using Section VIII Div 1 or Div 2 I would recommend not including the cladding in the design thickness calculations just to be conservative. If cladding in...

In general, no the WPS does not become obsolete. If the essential, non-essential and supplementary essential variables still apply to the materials in use the WPS is valid as written.

I am starting to mess with Div 2 calcs and my software (PVElite) is telling me that my λc is greater than 1.2 and to check 4.4.12.2(h). I can not find where in Part 4 it shows how to calculate λc. Once I know how then I can try to change my design to meet the code requirements. Anyone know where...

Does anyone know if in Alberta platform and ladder drawings for vessels need to be stamped by a P. Eng?

Thanks. I found my answer finally. Sketch (3) does not call out the radius specifically but Note 2 says to refer to Sketch (2) for dimensions not shown. This leads to Note 3 which states that "r to be at least 0.25g1 but not less than 3/16 in."

The end of the hub at the flange face or the end of the hub at the free end of the flange. Normally the large end and small end but in the case I'm looking at the hub is straight, not tapered.

Is there are code requirement for slip on flanges to have a corner radius at either the flange end or loose end?

Thanks for the feedback. I think we'll just ask the vessel supplier to do an FEA on the joint. I didn't know if this code allowed the configuration (sorry racookpe, no sketch available). The fabricator was treating it as a floating head per Appendix 1-6 and didn't consider the discontinuity.

We have a vessel we are analyzing where there is a hemi head attached to a conical shell section. The head has a larger ID than the small end of the cone it is attached to. This was done so that the head is shorter and is close to tangential to the cone. The head comes in with a tangent angle of...

I am reviewing a vessel drawing from a Chinese manufacturer and listed on the design table directly below the joint efficiency they have a listing for "filling coefficient." Anyone have any idea what that could be?

That would probably be in NBIC or API-510. I've always considered the ASME codes to be for brand new and API/NBIC for in use.