Peq/NC-3658.3 Selection - CAESAR II - Help

CAESAR II Users Guide

Language
English
Product
CAESAR II
Search by Category
Help
CAESAR II Version
12

Specifies whether to evaluate the flanges using the Kellogg Equivalent Pressure Method or the ASME B&PVC Section III Subsection NC-3658.3 method.

Peq

Evaluates the flanges using the Kellogg Equivalent Pressure Method.

Peq = 16M/(p)G3 + 4F/(p)G2 + PD £ Pressure Rating

Where:

Peq = equivalent pressure (for checking against flange rating)

M = bending moment on flange

G = diameter of effective gasket reaction

F = axial force on flange

PD = design pressure

NC-3658.3

Evaluates the flanges using the ASME B&PVC Section III Subsection NC-3658.3 equation (12) method. The software rearranges the equation so that the factored moment is less than the limit:

(36,000/3125) * Mfs / (C * Ab) < Min(Sy, 36000 psi) in U.S. customary units

(250/21.7) * Mfs / (C * Ab) < Min(Sy, 250 MPa) in SI units

Where:

Mfs = Bending or torsional moment (whichever is greater) acting on the flange

Sy = Yield strength of flange material at design temperature

C = Bolt circle diameter

Ab = Total cross-sectional area of bolts

For the ASME B&PVC Section III Subsection NC-3658.3 equation (13) method for dynamic events (Mfd), double the limit.