Locally Thinned Area Assessments

[pvuk]

Hi,

I am wondering if any forum users can help me out with an API 579 / BS 7910 related query.

As far as I can tell, neither the API 579 or BS 7910 codes apply limits to the axial and circumferential defect dimensions when investigating a locally thinned area. These assessment methods can permit quite large defects, but it appears to be up to the engineering judgment of the user to determine when a locally thinned area becomes an area of general thinning.

The codes do stipulate a maximum limit on the defect depth, but that is all I can see.

Is anybody aware of any other reference documents or best practice guidelines regarding LTA size limitations?

Thanks,

pvuk

 

[r6155]

Read again (slowly) API 579 and try to understand.
See ASME VIII-1
MANDATORY APPENDIX 32 LOCAL THIN AREAS IN CYLINDRICAL SHELLS AND IN SPHERICAL SEGMENTS OF SHELLS

Regards