The note 10 of table D-1 of B31.1 states:

"The stress intensification factors in the Table were obtained from tests on full size outlet connections. For less than full size outlets, the full size values should be used until more applicable values are developed."

Does anybody know a reference in the B31.1 code to WRC 329 allowing to use lower header Sifs for less than full size outlets?

Thanks in advance,
Veit
www.pipestressanalysis.com