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?
• Fatigue usage factor under Level C not added to A and B
   

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