Codes

Allowable stresses for finite element method (FEM) analysis are defined by the following codes implemented in Nozzle-FEM:

• ASME Boiler and Pressure Vessel Code. Part D. Properties. Section II, Materials – 2019.
• ASME Boiler and Pressure Vessel Code. Rules for Construction of Pressure Vessels. Section VIII, Division 1 – 2019.
• ASME Boiler and Pressure Vessel Code. Rules for Construction of Pressure Vessels. Section VIII, Division 2 – 2019.
• EN 13445-3. European Standard. Unfired pressure vessels – Part 3. Issue 1 (2002-05).
• JB 4732-1995-EN. Professional Standard of the People’s Republic of China – 1995.
• GOST 34233.1-2017. Vessels and apparatuses. Standards and methods of strength calculation. General requirements.
• GOST 34233.6-2017. Vessels and apparatuses. Standards and methods of strength calculation. Strength calculation under low-cyclic loads.
• GOST 34233.10-2017. Vessels and apparatuses. Standards and methods of strength calculation. Vessels and apparatuses operating in hydrogen sulphide environments.
• PNAE G-7-002-86. Standards of strength calculation for equipment and pipelines of nuclear power plants. –M.: Energoatomizdat, 1989.

Besides finite element method calculation, the program supports CIF and flexibility calculation via semi-analytic methods according to WRC 537/107(297) (Welding Research Council Bulletins No. 107, No. 297 “Local stresses in spherical and cylindrical casings caused by the external loads”) and BS5500-76 (British standard).

PASS/Nozzle-FEM performs similar calculations (without FEM analysis) of vessel elements and nozzle junctions as per the following codes:

• WRC-537 Welding Research Council. Bulletin. “Precision Equations and Enhanced diagrams for Local Stresses in Spherical and Cylindrical Shells due to External Loadings for implementation of WRC Bulletin 107”. 2013.
• GOST 34233.2-2017. Vessels and apparatuses. Standards and methods of strength calculation. Calculation of cylindrical and conical shells, dished and flat bottoms and covers.
• GOST 34233.3-2017. Vessels and apparatuses. Standards and methods of strength calculation. Reinforcement of openings in shells and heads under internal and external pressure. Strength calculation of shells and heads under external static loads on the nozzle.