What is the risk associated with bullheading a tee?

The correct answer highlights a significant issue that arises when bullheading a tee, which is the water hammer and disrupted steam flow. Bullheading occurs when two pipes are connected in a way that causes steam or fluid to flow in reverse directions, often leading to a turbulent flow pattern. This disruption can generate pressure waves that propagate through the system, resulting in water hammer, which is a phenomenon characterized by banging or knocking sounds in the piping. This is caused by the sudden change in momentum of the steam or condensate, and can lead to system damage over time.

Moreover, disrupted steam flow from bullheading can lead to poor efficiency and performance of the steam system, as the steam may not be delivered uniformly or might cause condensate buildup in areas where it shouldn't, further exacerbating flow issues. Understanding the implications of bullheading is crucial for maintaining the integrity and efficiency of steam systems, thus making this option the best choice.