Sizing and Design Requirements
The terms "grease interceptor" and "grease trap" are used interchangeably by the Town of Cary.
A grease interceptor is a chamber for fats, oils, and grease-laden wastewater to pass through and allow free or emulsified oil to float to the top for retention as the remainder passes through. For fats, oils and grease to float to the top, non-turbulent, static conditions are necessary. Interceptors are designed and sized based on anticipated flow rates and the load of fats, oils and grease.
A grease interceptor is a chamber for fats, oils, and grease-laden wastewater to pass through and allow free or emulsified oil to float to the top for retention as the remainder passes through. For fats, oils and grease to float to the top, non-turbulent, static conditions are necessary. Interceptors are designed and sized based on anticipated flow rates and the load of fats, oils and grease.
Emerging Science and Technologies in FOG
Food preparation and serving establishments deemed to need grease interceptors must adhere to the procedures and requirements below:
Sizing and Design Requirements
- General Pretreatment Program Plumbing Requirements
- Grease Interceptor Requirement Determination with Flow Chart
- Grease Interceptor Installation Planning
- Grease Interceptor Installation Permit Acquisition Process
- Grease Interceptor Sizing Spreadsheet
- Grease Interceptor Detail with Sample Vault
- Hydraulic Jump Sample Vault Detail
- Inlet and Outlet Sanitary Tee Diagrams
- Community Grease Interceptors
- When is a sewer extension needed?
- Town of Cary Inspections and Permits Department
For grease interceptor sizing and design questions please contact:
Donald Smith
Utility Pretreatment Manager
Public Works and Utilities Department
P.O. Box 8005
Cary, NC 27512
(919) 319-4564
donald.smith@townofcary.org
Utility Pretreatment Technicians
(919) 462-2072
