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Make sure you put the stiffeners on before you cut the window [dazed]

Have you asked the client to supply the nozzle loads? Your reinforcement design will not have a technical basis as you are just hoping it is adequate.

Does the refinery not specify any bolting guidance for the contractor to follow? They let them use random handbooks? Who knows the basis for those specified torque values? Targeting a stud stress with no regard to gasket style and dimensions is an outdated practice. In terms of pressure loading...

I’ve seen it limited to shell thickness. What is the design temperature?

Has this vessel been in service?

I am not sure what code of construction you are using but an example of an elastic-plastic ratcheting procedure is discussed in ASME VIII Div. 2 Part 5. For this you essentially use an elastic-perfectly plastic material model with isotopic hardening. This is conservative relative to kinematic...

Explicit integration is only conditionally stable; does adjusting your minimum time step help? How are you doing your differentiation in the subroutine? Accurate differentiation can be important for convergence. Also -...

I think 1503 is saying the opposite by his first comment. I agree with you Kevin.

The welds would need to be tested.

326.3 states the design, materials, fabrication, assembly, examination, and testing requirements of this code are not applicable to components listed in table 326.1 i.e. a B16.5 flange.

No

Seconding what Ed mentioned. Bolting procedures, refer to ASME PCC-1 for guidance on flange assembly. Gasket selection, I would try CMGC (Grafoil) or GMGC (Kammprofile)

If the leak was never repaired why did it just start coming out of the patch plate weep holes? Was the crack repaired from the inside? Do you know why it is cracking? SCC? Fatigue? Anyways, I've had much better success with performing a through-wall nozzle replacement than using a new shell...

What is the material of the base and overlay? Operating temperature? Do you use controlled bolting practices? Did you consider sending the flange to a lab for a failure analysis? Are you going to do weld repairs? PWHT? Hydrogen bakeout?

See ASME BPVC Section I

Oops, I had a typo in the original post. I meant to specify that I used an engineering UTS of 70 ksi not 80 ksi. Thanks for the explanation TGS4, looks like I implemented it correctly.

Hello, I am following Annex 3D.3 of VIII-2 for developing a stress-strain curve to be used in an Elastic-Plastic analysis and had a few questions. Currently, I am doing the following (true plastic strain plot only since I am using Abaqus): 1) Solve for stress at the proportional limit which is...

If you have to ask here... you definitely need a calculation review, especially for a vessel of this size. Here is a good book for reference on pressure vessel design .. https://www.amazon.com/Pressure-Vessel-Design-Manual-Dennis/dp/0123870003 Also see ... WRC 537...

Hello, I'm new to the Abaqus CAE software and am looking for some advice on inputting this geometry as a 3D solid or shell into Abaqus. The part I'm trying to model is a swage nozzle. I've attached an example of this swage fitting. Any tips? A video of modeling in a different CAD software ...

@DriveMeNuts - This is correct. They are parallel across the head, about equal spacing. @Some Curious Guy - Thanks for the input, will play around with this. @goutam_freelance - I understand this, looking for closed-form approximation.