The outlet pipe in a grease interceptor must originate within how many inches of the tank bottom?

The requirement for the outlet pipe in a grease interceptor to originate within 8 inches of the tank bottom is established to ensure proper function and efficiency of the interceptor. This placement allows for effective separation of grease and solids from wastewater.

When the outlet is positioned too high in the tank, it can lead to an incomplete separation process. Grease can wash out with the wastewater, defeating the purpose of the interceptor, which is to minimize the amount of grease entering the drainage system. By ensuring the outlet is no more than 8 inches from the bottom, the interceptor maintains the correct water level that encourages sedimentation and floating grease to remain within the tank, allowing only clarified water to exit.

Adhering to this measurement is crucial in maintaining compliance with plumbing codes, which are designed to protect public health and the environment by mitigating the risk of grease buildups in sewer lines and preventing blockages. Therefore, the establishment of the 8-inch standard is a critical aspect of grease interceptor design and installation.