The inlet pipe of a grease interceptor shall extend to how many inches below the liquid level?

The inlet pipe of a grease interceptor must extend 24 inches below the liquid level to ensure proper function and effective grease and oil separation from wastewater. This depth allows sufficient hydrostatic pressure to facilitate the entry of wastewater into the interceptor while preventing the grease from escaping with the effluent. The design aims to promote settling and ensures that the floating grease layer remains above the inlet and does not clog or disrupt the flow.

Choosing a different length for the inlet pipe, such as 6, 12, or 30 inches, could result in either insufficient separation or increased risks of grease escapes, which could create operational issues for the interceptor and lead to compliance concerns with wastewater regulations. Therefore, adhering to the 24-inch standard is crucial for the performance and efficiency of the grease interceptor system.