ASME B31.3 Considerations for Branch Connections Under External Pressure
Branch connections under external pressure are covered in para. 304.3.6. The same rules described in Sections 4.4 and 4.5 are used. However, only one-half of the area described in Section 4.4, covering welded branch connections, requires replacement. In other words, only one-half of the area A1 requires replacement. Also, the thicknesses used in the calculation are the required thicknesses for the external pressure condition. #Little_PEng.
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