Symbols and Abbreviations	Meaning
$S_{alt,k}$	effective alternating equivalent stress amplitude
$K_f$	fatigue strength reduction factor
$K_{e,k}$	fatigue penalty factor
$\Delta S_{p,k}$	component stress range
$\Delta S_{LT,k}$	the component stress range for different the fatigue penalty factor
$S_{PS}$	maximum allowable stress
$K_{v,k}$	Poisson correction factor
$S_a$	computed stress amplitude
$E_T$	modulus elasticity of the material
n	total number of the design cycles
N	the permissible number of cycles
$D_f$	the fatigue damage factor
Y	stress factor used to compute X
X	exponent used to compute the permissible number of cycles
LNG	liquefied natural gas
ASME	American society of mechanical engineers
FDF	fatigue damage factor