Dear Experts,

I am facing a problem in understanding the ASME B31.3 code requirement regarding the exclusion of impact testing for the LTCS material below -29 deg C to -104 deg C for which the code requires to satisfy the stress rato below 0.3.

Please give your expert advise for the understanding of the below three requirement with respect to caesar analysis.

According to ASME B31.3(FIG 323.2.2B), General notes ,
Stress ratio is defined as the maximum of the following
1) Nominal Pressure Stress (based on minimum pipe wall thickness less allowance) divided by S at the design minimum temperature.
2) for piping components with pressure ratings,the pressure for the condition under consideration divided by the pressure rating at the design minimum temperature.
3) combined longitudinal stress due to pressure,dead weight, and displacement strain (stress intensification factors are not included in this calculation ) divided by S at the design minimum temperature.In calculation longitudinal stress,the forces & moments in the piping system shall be calculated using nominal dimensions & the stress shall be calculated using section properties based on the nominal dimensions less corrosion ,erosion, & mechanical allowance

Thanks