Boiler & Pressure Vessel Code, Rules for Construction of
Nuclear Power Plant Components Division 1,
Subsection NB, Class 1 Components
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Comments, Questions, and Answers on ASME NB Piping code in AutoPIPE
Allowable issues
> Does AutoPIPE automatically multiply by the product of the weld in the stress indices (per code requirements) ASME NB-3683.2A ?
> Ratchet allowable, is Sy the minimum from each load pair considered or the lowest Sy from the whole set of load cases analysed
> Calculate average Sm value
> Override value not used in calculating allowable, why?
Eq. 10 issues
> Calculate the allowable for Eq 10
> Results from ASME NB Eq 12 + Eq. 13 stresses don’t equal Eq. 10, for a specific transient pair
> Eq 10, allowable hand calculations are 2 times reported values
Eq. 10a issues
> Non-repeated Anchor Movement (e.g. Building Settlement)
Eq. 13 issues
> Eq 13, different results between different code years
Fatigue issues
> Class 1 NB fatigue analysis, results shows the usage of the highest alternating stress range, and not the remaining stress ranges, why?
Stress Indices & Flexibility factor issues
> ASME NB-3683.7 Stress Indices, does AutoPIPE use the Bend / Elbow properties (O/D and t) or the preceding pipe properties (O/D and t)?
> ASME NB Bend Stiffness and Pressure stress around a bend, does AutoPIPE use the Bend / Elbow properties (O/D and t) or the preceding pipe properties (O/D and t)?
> ASME NB flexibility calculation (k)
Thermal Stress Ratchet issues
> For calculation of ASME NB - 3653.7 Thermal Stress Ratchet, does AutoPIPE perform this check per code requirements?
See Also
Piping Code Calculations - AutoPIPE