Grease Interceptor Flow Capacity
The inverse of the grease-trap sizing tile: the peak fixture flow an existing interceptor is rated to serve, peak_flow = volume / (retention x loading). A 1,000-gal interceptor at 30 min retention and 1.25 loading serves ~26.7 gpm; compare to the connected sinks' DFU flow to check for undersizing (PDI G101 / IPC). AHJ governs.
Formula and source
peak_flow_gpm = interceptor_volume_gal / (retention_minutes × loading_factor), the PDI G101 / IPC sizing relation Volume = peak GPM × retention × loading solved for the flow.
PDI G101 by name; IPC 2021 (International Plumbing Code). Section 1003.
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