Rhode Island Journeyman Plumber Practice Exam

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What is the minimum diameter for a trap seal in plumbing fixtures?

1 inch
2 inches
3 inches
4 inches

The correct answer is: 2 inches

The minimum diameter for a trap seal in plumbing fixtures is established to ensure that the trap can effectively hold an adequate volume of water, which is critical for preventing sewer gases from entering the living space. A 2-inch minimum trap seal is standard because it allows for sufficient water retention while also accommodating the necessary flow for drainage without causing clogs or backflow. The trap seal height is important in maintaining water flow balance and ensuring that the fixture operates correctly. If the diameter was too small, it would be difficult to achieve the required seal without the risk of the water evaporating or being siphoned away due to negative pressure from drainage events. A larger diameter could lead to issues with space and installation in tighter plumbing scenarios. Moreover, this standard plays a critical role in maintaining sanitary conditions by ensuring that the trap remains filled, which is an essential function in all plumbing design.