ASME BPV-III-1-NB, AutoPIPE Nuclear Piping Code FAQ

Boiler & Pressure Vessel Code, Rules for Construction of
Nuclear Power Plant Components Division 1,
Subsection NB, Class 1 Components 

Note: Please see the following AutoPIPE help section: 

Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> select a piping code to see the calculations performed by AutoPIPE.

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

Bentley AutoPIPE