Experimental results of elastic-plastic behavior and plastic limit loads (yield point loads) of five tee-shaped cylinder intersections and a plain pipe are reported herein.The intersecting models were machined from a single hot rolled steel plate.The nozzle-vessel attachments (or branch pipe tee connections) were subjected to one of the loading modes: internal pressure, in-plane or out-of-plane couples applied to the nozzle extremity.The out-of-plane couple loading is found be the critical case.However, a comparison of the out-of-plane couple data shows that restraining the nozzle head from lateral movement or increasing the vessel thickness, results in increased load carrying capacity of the nozzle-vessel attachment.The plain pipe was subjected to an external moment loading.The results of these test confirms the validity of a beam analogy for the pipe.