Minnesota Boiler License Practice Exam

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Why are crosses used instead of ells on water column connections?

Cost less
Has more strength
Line may be easily cleaned
Higher pressure tolerance

The correct answer is: Line may be easily cleaned

The usage of crosses instead of ells on water column connections is primarily due to the ease of cleaning that crosses provide. Crosses allow for a more straightforward access point to the flow paths in the system, which facilitates maintenance activities such as flushing or cleaning the water column. This is an essential consideration in maintaining boiler efficiency and preventing sediment buildup, which can adversely impact performance. In contrast, while cost, strength, and pressure tolerance are indeed relevant factors in pipe and fitting selection, they do not adequately explain the preference for crosses in this context. The design and flow characteristics associated with crosses inherently lead to better cleaning capabilities, making them more suitable for situations where the maintenance of a clean and efficient water column is crucial.