MBE / HUB-Certified Texas MEP
Grease Interceptor Sizer
Quick lookup for grease interceptor capacity per UPC §1014 / IPC §1003 sizing tables. Pick the fixtures connected and we return the required interceptor volume in gallons. Restaurants in most TX cities require interceptor sizing as part of plumbing permit.
DFU (drainage fixture unit) method is standard. Seats method is used when DFU detail not yet known.
Sum of DFUs from 3-comp sink (3 each), pre-rinse (3), mop sink (3), floor drain (2), pre-wash (3), etc. per IPC Table 709.1.
Some TX cities apply a multiplier above UPC base. Houston requires 25% over UPC; Austin 50% in many cases.
Min interceptor capacity
750gal
Basis: 20 DFU × 30 sec/DFU × flow rate / 60 min ≈ 750 gal capacity (UPC method). Round up to next stocked size.
3 stocked sizes
Most TX restaurants land at 750, 1000, or 1500 gallon interceptors. Interceptor cost difference between sizes is small; reviewer comments are far more expensive — we round up.
Need this stamped on your plumbing isometric?
Pyra Engineering produces sealed plumbing isos with grease interceptor calcs and product-specific callouts. Quote in 1 business day.
Important. This is a UPC-based estimator. Some TX cities have local amendments, cooking-equipment-based methods (PDI G-101), or per-meal calculations. Confirm with your AHJ. Permit submittal requires sealed plumbing drawings.