The sizing of grease traps should consider which two factors?

The sizing of grease traps is primarily influenced by the type of facility being served and the estimated daily sewage flow. Each facility, such as a restaurant or a food processing plant, generates different amounts and types of grease and solids, which must be accounted for to ensure effective grease capture and prevent overflow or system failure. Understanding the facility's operational characteristics helps in selecting a grease trap size that's capable of handling peak flows and grease loads.

Estimating daily sewage flow is equally vital, as it reflects the volume of wastewater generated on a daily basis. This figure is crucial in determining how much grease and solids will enter the trap, which affects its sizing and retention capability. Proper sizing ensures that the grease trap can efficiently separate grease, leading to effective management of wastewater and compliance with local environmental regulations.

In contrast, while grease retention capacity and tank material, the size of the property, or the number of residents and plumbing fixtures may also play roles in grease trap performance or installation decisions, they do not holistically encompass the primary factors for sizing grease traps. Therefore, focusing on the facility type and sewage flow provides a solid foundation for making appropriate sizing recommendations.