The maximum trap loading allowed on a 3 inch trap is _____.

The maximum trap loading allowed on a 3-inch trap is 6 units. This value is determined based on the Uniform Plumbing Code, which establishes specific guidelines for plumbing installation and drainage systems to ensure proper function and prevent issues such as overloading or blockage.

In the context of drainage systems, "units" refer to the load that the trap can handle, typically measured in terms of fixture units, which correspond to the potential flow or usage of fixtures connected to the drainage system. A 3-inch trap is designed to manage a specific capacity of wastewater, and the 6 units maximum provides adequate allowance for flow without compromising the effectiveness of the trap in preventing sewer gases from entering the building.

Understanding this maximum loading is crucial for ensuring that plumbing systems remain functional and comply with the Uniform Plumbing Code, helping to prevent overloading that could lead to drainage problems or backflow issues.