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ASME Pressure Vessel Dimensional Tolerances

ASME Pressure Vessel Dimensional Tolerances

ASME Pressure Vessel Dimensional Tolerances

(OP)
Does ASME Sect. VIII Div. I reference allowable tolerances for dimensions on a Pressure Vessel?
i.e. Nozzle projection, Nozzle orientation, elevation, etc?


RE: ASME Pressure Vessel Dimensional Tolerances

ASME VII does not specify tolerance for the items you mention.

Steve Braune
Tank Industry Consultants
www.tankindustry.com

RE: ASME Pressure Vessel Dimensional Tolerances

No, these are considered manufacturing details that would be part of the engineering specification for fabrication of the vessel.

RE: ASME Pressure Vessel Dimensional Tolerances

(OP)
While performing a dimensional inspection of a pressure vessel, the outside diamenter of a nozzle repad was found to be 1" less that the ASME code calcs. required. Would this dimension be considered as a tolerance issue, or should this be addressed as a defective material issue?  

RE: ASME Pressure Vessel Dimensional Tolerances

How was the thickness of the pad?

RE: ASME Pressure Vessel Dimensional Tolerances

This is not a material defect issue, this is a nonconformance issue between what was found during shop fabrication and comparing to your original engineering calculations. The nonconformance should be dispositioned (for example by engineering) by whatever method your QC Manual describes.

Go back to ASME Section VIII, Div 1 and re-check the A(5) repad calc, and compare with your total area of reinforcement requirements.

RE: ASME Pressure Vessel Dimensional Tolerances

metengr is correct in a way to deal with this.

Keep in mind-tolerance or not-if the item has anything that is below the minimum required diminsions by the Code calcs. it is unacceptable.

See UG-16,UG-96,Appendix 3. You may be able to do a "work around" under a NCR or may require additional material to be added.

RE: ASME Pressure Vessel Dimensional Tolerances

(OP)
Thanks guys, I appreciate the info.

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