Grease Trap Sizing Calculator

The Grease Trap Sizing calculator accurately sizes passive grease traps, grease interceptors, and automated grease recovery devices (GRD) for foodservice facilities.

Passive grease traps or grease interceptors are similiar to Reservoirs.

Passive Grease traps store and accumulate the fat, oil, grease, (FOG) and food solids until the grease trap is pumped out. Passive Grease Traps require time for the FOG to separate and settle from the wastewater (detention time). Automatic Dishwashers are not attached to a grease trap as the high volume wastewater outflow will bypass the grease trap. It is important to size a grease trap larger than calculated (round up to next available size only). A grease interceptor that is extremely oversized will have longer periods between pump-outs. The rotting grease will adversely affect the structure of the grease interceptor.

A Grease Recovery Device completely controls the inflow of Wastewater.

A Grease Recovery Device (GRD) or Automatic Grease Trap separates the FOG from the wastewater as it enters the device. Grease free water goes down the drain while the separated FOG collects in a visible container. Wastewater with a high flow rate (automatic dishwasher) will not bypass a GRD. A 3-compartment sink will have a longer drainage time period if the GRD is undersized. FOG will not enter the sanitary sewer or Septic system with a Goslyn Grease Recovery Device.

NOTE

Automatic dishwashers attach to Goslyn Grease Recovery Devices.

Automatic dishwashers do not attach to passive Grease traps.

The GPM of an automatic dishwasher is not included in Grease Recovery device
and Grease Trap sizing formulas.

STEP #1. ENTER COMPARTMENT SINK MEASUREMENTS
		ENTER COMPARTMENT SINK MEASUREMENTS IN INCHES			231 Cubic Inches in 1 US Gallon
Sinks Measured in Inches		Length	Width	Depth	Cubic Capacity	Volume In US gallons
Sink # 1
Compartment 1
Compartment 2
Compartment 3
Compartment Sink # 1 - Totals						Gallons
Sink # 2
Compartment-1
Compartment-2
Compartment-3
Compartment Sink # 2 - Totals						Gallons
Maximum Discharge (2 Sinks Combined)						Gallons
Drainage Load - 75% of Maximum Discharge (Dishes Displace 25% of the water in sink)						Gallons

STEP #2. ENTER DRAINING PERIOD
Enter 1 or 2 Minute Draining Period (Drain Standard)							Minute
Actual Drainage Load in Gallons Per Minute (GPM)							GPM

STEP #3. ENTER ADDITIONAL APPLIANCES
Enter Appliances			Appliance # 1				GPM
Including			Appliance # 2				GPM
Rotisserie, Wok,			Appliance # 3				GPM
Combi-Oven, Slop Sink			Total Additional Discharge				GPM

STEP #4. VIEW REQUIREMENTS					Total Gallons Per Minutes
			Actual Drainage Load				GPM

Passive Conventional Grease Trap Required								GPM
Grease Trap Sizes (GPM)				10	15	20	25	35	50
Grease Trap Weights (LBS)				20	30	40	50	70	100

	Goslyn Grease Recovery Devices
Goslyn Facility Use			Goslyn Drain Times in Minutes
Restaurant Unit H-16 L-24 W-16			GOS-40 Drainage Time				Minutes
Restaurant Unit H-14 L-36 W-16			GOS-60LP Drainage Time				Minutes
Restaurant Unit H-20.5 L-37 W-24			GOS-80 Drainage Time				Minutes
Goslyn Grease Recovery Device Measurements Link
	1 US Gallon = 3.78541178 Litres

Grease Trap Sizing Formula

2 or 3 Compartment sink Cubic Capacity = width x length x depth (in inches)

Volume in Gallons = Cubic Capacity / 231

1 US Gallon = 231 square inches

Grease Interceptor Sizing

GPM for an In-ground Grease Interceptor is multiplied by a factor of 10 (minutes) to accomodate settling of food solids and hardening of animal fats

In-Ground Grease Interceptor GPM = Calculated GPM X 10

Make The Right Choice

Goslyn Grease Recovery Devices

Your Last Grease Trap Purchase