I am assuming by your request, that this item is addressed as requiring a fatigue analysis.
"6.1.6.3 Peaking Of Welds in Shells and Heads For Internal Pressure
a) If a fatigue analysis is required, see paragraph 4.1.1.4 then the peaking height, p d , at Category A weld
joints shall be measured by either an inside or outside template, as appropriate (see Figure 6.1). As an
alternative, the peaking angle may be determined using the procedure described in Part 8 of API
579-1/ASME FFS-1 for materials operating outside the creep regime, or Part 10 of API 579-1/ASME
FFS-1 for materials operating within the creep regime."
If I were you, I'd be taking the allowed alternative mentioned in bold.
Regards,
Gerald
Thanks Gerald, but the paragraphs on bold font are alternative procedure for determining peaking angle not the allowable value/tolerance for peaking.
As mentioned on 6.1.6.3 c) If a fatigue analysis is required, the allowable value of dp (peaking height) shall be determined using paragraph 4.14 and shall be shown in the Manufacturer’s Design Report.
Paragraph 4.14 is an Evaluation of Vessels Outside of Tolerance
4.14.1 Shell Tolerances
If agreed to by the user, the assessment procedures in Part 5 or in API 579-1/ASME FFS-1 may be used to qualify the design of components that have shell tolerances that do not satisfy the fabrication tolerances in paragraph 4.3.2 and 4.4.4.
Anyway I gone through all the reference paragraph and found out the tolerance under 4.4.4.4,.
4.4.4.4 Spherical Shells and Formed Heads - the tolerance requirements in paragraph 4.3.2.2 shall be satisfied. In addition, the "MAXIMUM LOCAL DEVIATION" from the true circular form, e , for SPHERICAL SHELLS and ANY SPHERICAL PORTIONS of a formed head SHALL NOT EXCEED THE SHELL THICKNESS.
Finally our peaking inspections reports were accepted by owner. :-D
Regards,
Raymund