Branch stress increase coefficient
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1. Since the stress increase factor specified in the reducer fitting standard (AEME B31.3) is incorrect, why is C2 set to FALSE by default? Won’t the stress increase factor according to ASME B31.3 rules be too low in this case?
In ASME B31.3 standard, the C2 parameter is set to FALSE by default because, in most cases, the stress concentration factor (SCF) calculation for branch fittings is based on relatively conservative assumptions. The standard aims to ensure the security of the system; therefore, C2 is generally not activated in the absence of specific evidence indicating a need for adjustment. If the SCF calculation results for the reducing tee are indeed too low, this may lead to an inadequate assessment of safety in practical applications. However, ASME B31.3 specifies this practice based on extensive engineering experience and experimental data, with the aim of balancing safety and cost-effectiveness. If engineers or designers believe that the default SCF values do not meet the safety requirements of a particular project, they can choose to activate C2, or employ other more conservative design methods and parameters to ensure the reliability and safety of the structure. .