In order for a steam trap to be effective in accomplishing its intended purpose, what statement is true regarding its installation?

Correct Answer: Option D — The steam trap should never be painted and should never be covered with insulation.

Steam traps must remain unpainted and uninsulated to function correctly. These devices rely on heat loss to the surrounding atmosphere to operate, particularly thermostatic types. Covering them with insulation or paint prevents the necessary cooling of the internal element, causing the trap to remain stuck in the open position.