CAESAR II supports many United States and international codes. This section contains the stress values used by the software.
Nomenclature
Use the nomenclature definitions that follow unless a code section specifically provides a different definition.
Am - Cross-sectional metal area in the pipe.
B1 - Primary stress index (component specific)
B2 - Primary stress index (component specific)
Di - Internal diameter
Dm - Mean diameter
Do - Outer diameter
dT - Change in temperature
E - Elastic modulus
f - Cyclic stress range reduction factor
F1 - Hoop stress design factor
Fax - Axial force
FAC - A unitless factor used for a number of purposes depending on the piping code. For more information, see the CAESAR II User's Guide.
i - Stress intensification factor
ii - In-plane stress intensification factor
io - Out-of-plane stress intensification factor
ia - Axial stress intensification factor
it -Torsional stress intensification factor
I - Sustained moment index
Ii - Sustained in-plane moment index
Io - Sustained out-of-plane moment index
Ia - Sustained axial force index
It - Sustained torsional moment index
k - Occasional load factor
Ma - Resultant moment due to weight and other sustained loadings
Mb - Resultant moment due to occasional loadings
Mc - Range of resultant moments due to expansion and displacement loadings
Mi - In-plane moment
Mo - Out-of-plane moment
Pi - Internal pressure
Pe - External pressure
R - Radius of pipe or bend
Sa - Axial stress
Sb - Bending stress
Sc - Cold allowable stress (ambient or reference temperature)
Se - Expansion stress
Seq - Equivalent combined stress (von Mises or Tresca)
Sh - Hot allowable stress
Shoop - Hoop stress
Sl or SL - Longitudinal stress
Slp - Longitudinal pressure stress
Ss - Tangential shear stress
St - Torsion stress
SU - Ultimate tensile strength
Sy - Yield stress
T - Temperature derating factor
tn - Nominal wall thickness
Z - Pipe section modulus
Ze - Effective section modulus for branch
a - Coefficient of thermal expansion
n - Poisson’s ratio