Interferences between nozzles 4

[Mechanical1991]

I have an older pressure vessel which does not show an ASME stamp and there isn't an U1A form. Now we are thinking of reconditioning it and extending its time life according to NBIC. In this vessel there are 2 very close nozzles of 18” and 1” (without reinforcement Repad). When I try to validate the design in a software I get a alert “one or more nozzles do not meet proper spacing requeriments” and "Diameter Limit clash between: M1 and C4. The centerline Dist. is 10.83 while the sum of the limit Radii is 16.12 in."

Does anyone know if this can be accepted by an ASME inspector? or have any experience with similar cases.

 

[Rubje]

I honestly doubt it.

An ASME inspector was supposed to examine each weld during fabrication in order to sign off on the ASME U-1a form.

 

[chicopee]

First check either the tube sheets, heads or the adjoining vessel surfaces of the pressure vessel for possible stamping about the identity of the pressure vessel. The stamping may be hard to see due to the age of the vessel so one trick which I learned as a former NB of PV's is to moisturize the suspected stamping areas that I mentioned with a wet rag and then shine a light from a flashlight to highlight the markings. If the vessel is insulated some portions of that insulation may have to be removed. Since you did not state what type of vessel you have, the markings will either be on the upper center portions of the tube sheets or close to the shell edge welded to one of the tube sheets,
About your question in your OP, it is very unlikely that your PV will be accepted by an authorized (NB/ASME) boiler and pressure vessel inspector, however, there could be a way out but first talk to an insurance company that provides boiler and machinery coverage for guidance from their specialist. for a fee, that specialist may perform the required evaluation and all associated calculations or may ask for an evaluation from a professional engineer specializing in fired and unfired pressure. If that report shows consistency with the applicable ASME code then you have a shot at the vessel being accepted by the B&M authority of your State. The State may even assign their own number to your installation. All requirements set by the National Bord (NB) must be met for a NB number to be assigned to that vessel.
Before proceeding you should also make inquiries to the Nation Bord of Fired and Unfired pressure vessels. If you contact the State for guidance you may be required not be able to start until you meet that State requirement.

 

[r6155]

Without any documentation, this PV is scrap.
Consider a new PV, it depends on the dimensions.

Regards

 

[LittleInch]

I have an older pressure vessel errr maybe I have a large lump of scrap metal masquerading as Pressure Vessel.

How exactly is anyone allowing this to be in service without a stamp, document or nameplate?

If you can trace the vendor you might stand a chance, but otherwise this sounds like an uphill struggle.

Any drawings or sketches or photos?
What does "very close" mean?
Pressure?

Do you need both nozzles or could you fill the smaller one in?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[david339933]

Ignoring the documentation part, there are rules in the Code for nozzles which have overlapping areas of reinforcement. Software will/can't determine all scenarios, they give a warning to bring your attention to the possible deficiency.