Learn How To Calculate The Perfect Grease Trap Size For Your Restaurant!
What To Know
- The retention time is the amount of time that wastewater remains in the grease trap to allow FOGs to separate and float to the surface.
- Using the previous example with a flow rate of 1000 GPH, a grease trap with a capacity of 2000 to 4000 gallons would be suitable.
- The grease trap sizing factor is a multiplier that considers the type of food served in your kitchen.
Grease traps are essential components in commercial kitchens, intercepting and retaining fats, oils, and greases (FOGs) to prevent them from entering the wastewater system. Determining the appropriate grease trap size is crucial to ensure effective FOG removal and avoid potential plumbing issues. This comprehensive guide will empower you with the knowledge to calculate grease trap size accurately, ensuring your kitchen operates smoothly and efficiently.
Determining Flow Rate
The first step in calculating grease trap size is to determine the flow rate of wastewater generated by your kitchen. This can be estimated using the following formula:
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Flow Rate (GPM) = Number of Meals Served per Hour x Average Water Usage per Meal
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For example, if your kitchen serves 200 meals per hour and each meal requires an average of 5 gallons of water, your flow rate would be 200 x 5 = 1000 gallons per hour (GPH).
Grease Trap Capacity
Once you have determined the flow rate, you can calculate the required grease trap capacity using the following formula:
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Grease Trap Capacity (Gallons) = Flow Rate (GPH) x Retention Time (Hours)
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The retention time is the amount of time that wastewater remains in the grease trap to allow FOGs to separate and float to the surface. The recommended retention time for grease traps is typically between 2 and 4 hours.
Using the previous example with a flow rate of 1000 GPH, a grease trap with a capacity of 2000 to 4000 gallons would be suitable.
Grease Trap Sizing Factor
The grease trap sizing factor is a multiplier that considers the type of food served in your kitchen. Different types of food produce varying amounts of FOGs, and the sizing factor adjusts the grease trap capacity accordingly.
| Food Type | Sizing Factor |
| — | — |
| Light (e.g., salads, sandwiches) | 1.0 |
| Medium (e.g., pasta, stir-fries) | 1.5 |
| Heavy (e.g., fried foods, steaks) | 2.0 |
If your kitchen serves a combination of food types, use the highest sizing factor applicable.
Adjusting for Peak Flow
Commercial kitchens often experience peak flow periods when multiple meals are prepared simultaneously. To account for this, the grease trap capacity should be increased by 25% to 50% above the calculated value.
Choosing the Right Grease Trap Type
There are two main types of grease traps:
- Gravity Grease Traps: Utilize gravity to separate FOGs.
- Mechanical Grease Traps: Employ mechanical devices, such as skimmers or pumps, to remove FOGs.
The type of grease trap you choose will depend on the flow rate, grease load, and space constraints of your kitchen.
Installation Considerations
When installing a grease trap, consider the following factors:
- Location: Choose a location that allows for easy access for cleaning and maintenance.
- Accessibility: Ensure there is adequate space around the grease trap for maintenance and repairs.
- Plumbing: Connect the grease trap to the wastewater system according to local codes and regulations.
Maintenance and Cleaning
Regularly cleaning and maintaining your grease trap is essential to ensure its optimal performance. This includes:
- Removing FOGs: Regularly skim or pump out FOGs from the grease trap.
- Cleaning the Trap: Clean the inside of the grease trap thoroughly to remove any accumulated grease or debris.
- Inspecting the Grease Trap: Regularly inspect the grease trap for any leaks, cracks, or other damage.
Frequently Discussed Topics
1. What is the purpose of a grease trap?
A grease trap intercepts and retains FOGs from wastewater to prevent them from entering the wastewater system and causing blockages.
2. How often should I clean my grease trap?
The frequency of cleaning depends on the usage and flow rate of your kitchen. Generally, grease traps should be cleaned every 1 to 3 months.
3. Can I use a grease trap for residential use?
Yes, grease traps are also available for residential use, but they are typically smaller in size and capacity.
4. What are the signs of a failing grease trap?
Signs of a failing grease trap include slow drainage, foul odors, and FOGs backing up into the kitchen.
5. Who should I contact for grease trap maintenance?
Contact a licensed plumber or grease trap service provider for professional maintenance and cleaning.
