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More info: design pressure / temperature, material, diameter, service,.....etc.

Send us a hand drawing.

SA-965 for shell flange and tubesheets. SA-182 for nozzle flange and fittings.

@ EngTipsAccount1234 It is best to have a sketch to avoid mistakes.

Why do you choose straight thread?.

Straight thread is mentioned in several places: UG-37(g), UG-43(e)...etc, etc. Use UG-46(i) at your convenience.

See UG-31 (2) Where ends are threaded, additional wall thickness is to be provided in the amount of 0.8/n in.(20/n mm) [where n equals the number of threads per inch (25.4 mm)]

See Figure UW-16.1 (g).

No problem, the O'Ring does all the work.

@ m_ridzon Are you capable of managing this project? It is a CRANE Do you have experience in welding, inspection and workshop testing?

I don't know your activity: manufacturing? Process design and manufacturing? Be careful with the scope of work, think about money and prestige. Avoid conflicts and headaches.

There is a tendency to avoid testing, this is not good practice.

Where is the corner joint here?

When was the inspection before this one? What is the actual thickness of the column? Is this the only column with this defect?

Year of construction? Corrosion allowance? Original design calculation? Colum type and dimension? Materials? Design drawings?.....etc, etc.

Please take care of the calibration of the instrument and use qualified personnel.

Please, send us the actual design detail drawing with the tubesheet.

I suggest Acoustic Emission Examination, see ASME V. Regards.

More data: tank diameter / height, wind, seismic, type of roof, corrosion, API 650?

@Trestala You are those engineers (engineers?) who look for a sketch in the CODE and if you don't find it, you have nothing to do. You have to read the text.