// CODE SNIPPET
1014.3.6 Sizing Criteria
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The volume of the interceptor shall be determined by using Table 1014.3.6. Where drainage fixture units (DFUs) are not known, the interceptor shall be sized based on the maximum DFUs allowed for the pipe size connected to the inlet of the interceptor. Refer to Table 703.2, Drainage Piping, Horizontal.
| DRAINAGE FIXTURE UNITS1, 3 (DFUs) |
INTERCEPTOR VOLUME2 (gallons) |
|---|---|
| 8 | 500 |
| 21 | 750 |
| 35 | 1000 |
| 90 | 1250 |
| 172 | 1500 |
| 216 | 2000 |
| 307 | 2500 |
| 342 | 3000 |
| 428 | 4000 |
| 576 | 5000 |
| 720 | 7500 |
| 2112 | 10 000 |
| 2640 | 15 000 |
For SI units: 1 gallon = 3.785 L
Notes:
1 The maximum allowable DFUs plumbed to the kitchen drain lines that will be connected to the grease interceptor.
2 This size is based on DFUs, the pipe size from this code; Table 703.2; Useful Tables for flow in half-full pipes (ref: Mohinder Nayyar Piping Handbook, 3rd Edition, 1992). Based on 30-minute retention time (ref.: George Tchobanoglous and Metcalf & Eddy. Wastewater Engineering Treatment, Disposal, and Reuse, 3rd Ed. 1991 & Ronald Crites and George Tchobanoglous. Small and Decentralized Wastewater Management Systems, 1998). Rounded up to nominal interceptor volume.
3 Where the flow rate of directly connected fixture(s) or appliance(s) have no assigned DFU values, the additional grease interceptor volume shall be based on the known flow rate (gpm) (L/s) multiplied by 30 minutes.
EXAMPLE 1014.3.6
GRAVITY GREASE INTERCEPTOR SIZING EXAMPLE
GRAVITY GREASE INTERCEPTOR SIZING EXAMPLE
Given: A restaurant with the following fixtures and equipment.
One food preparation sink; three-floor drains - one in the food prep area, one in the grill area, and one receiving the indirect waste from the ice machine and a mop sink.
| Kitchen Drain Line DFU Count (from Table 702.1): | ||
| 3 floor drains at 2 DFUs each | = | 6 DFUs |
| Mop sink at 3 DFUs each | = | 3 DFUs |
| Food prep sink at 3 DFUs each | = | 3 DFUs |
| Total | = | 12 DFUs |
Using Table 1014.3.6, the grease interceptor will be sized at 750 gallons (2389 L).
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