Intended Market: Miami DERM
Satisfies Miami DERM 99% efficiency requirements. Learn more about our solutions for this region. Also approved in jurisdictions where a baffle is required.
99% Efficient, 75 GPM Hydromechanical Grease Interceptor
The GB-250-B offers best-in-class certified grease capacity and 20% kitchen solids waste capacity. It can be installed above grade (on the ground) or buried below grade (compatible with FCR2 risers to bring system to grade), as well as indoor or outdoor. The triple inlet and triple outlet features allow for installation flexibility, including the ability to connect an unused inlet/outlet for remote pumpout (PP3 compatibility - this unit requires quantity of 2).
Rugged polyethylene tank body
No flow control required, first in the industry certified to Type D of the ASME standard
Safety Star® access restrictor prevents accidental entry
Fits through 36" doorways
Contains a baffle wall
Flow Rate/Grease Capacity
75 GPM (4.7 L/s) / 1,817 lbs (824 kg) at 99%
Solids Capacity 55 gal (208.2 L)
Liquid Capacity 277 gal (1,048.6 L)
Weight 398 lbs (180.5 kg)
Installation Location Indoor/Outdoor
Schier's cover adapters give 4" of vertical adjustability and up to a 10-degree tilt in any direction, helping to ensure covers are installed perfectly inline on the concrete pad.
Three outlets available for installation flexibility and optional pumpout port connection.
Product ID label with technical and certification details (also available inside the cover adapter)
In-series label that shows grease capacity for in-series installations
"Made By" label featuring one of our product builders and the date your interceptor was built
Water, grease and solids enter a grease interceptor through an inlet diffuser moving toward the bottom of the tank. The mixture first meets the diffuser foot, which increases cross sectional area and slows the velocity of flow entering the tank. The mixture hits the inlet wall, forcing water and grease to flow upward creating a floating grease layer, while solids sink and settle in the bottom. The dissipation aids in the creation of laminar flow, allowing time for grease and water to separate as they move across the tank. The outlet diffuser draws clean water from the bottom of the tank and delivers it into the downstream flow.
These units are traffic rated if they are installed in accordance with our installation instructions. The unit will need the H-20 load-rated cast iron covers and a traffic-rated pad at grade per our installation detail.
These units have solids capacity of 20% or more of the unit's liquid volume, but food waste grinders can quickly overwhelm a grease interceptor. If the food waste grinder is connected to the unit, we recommend a solids interceptor in front of the grease interceptor.
These units can be used with a dishwasher. If the dishwasher will have a discharge temperature higher than 150 degrees Fahrenheit, the system will require a drain tempering valve to reduce the water temperature.
These units can be suspended from above (with the exception of GB-1000 and GB-1500). The unit needs to be fully supported across the bottom with risers extending to the floor above. It is the responsibility of the specifying engineer or installer to design a support system appropriate for the weight of the unit with water. If suspending a GB-250, the unit must be installed with the above grade support kit (AGS1). If suspending a GB-500, the unit must be installed with the above grade support kit (AGS2).
If the units will be installed in an area where the water table will crest the inlet/outlet pipe, additional steps need to be taken to protect the unit from the extreme hydrostatic forces. The unit would need to be placed in a water tight vault or encased in concrete. If there is a possibility that ground water will come into contact with the unit, there needs to be a high-water/anti-flotation anchor kit installed (AK1, AK2, AK3).
These units do not require a fixture vent. The internal design of the unit will ensure proper function without a fixture vent. Any venting to the piping connected to our unit is at the discretion of the local authority.
There should be a minimum of 6" between the units when installed in series. In a buried application, this space will ensure there is enough backfill in between the units.
Due to the low head pressure in this scenario, the first solution is to remove the internal flow control. This low head pressure ensures the unit will not exceed its certified flow rate. If that doesn’t solve the issue, the next solution is to add a flow restrictor to the tailpiece of the fixture.
The adjustable adapters that ship with these units offer up to 4" of built-in riser height. The maximum height for field cut risers is 94," which is equivalent to three FCR2 risers (sold separately). If the unit is suspended with risers to the floor above, they can use more than three if needed.
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