StormSafe - Filter Cartridge Vault System

Stormwater runoff enters the vault through the Pretreatment chamber where the heaviest sediments begin to separate from the water and drop to the bottom of the chamber. As the runoff fills the chamber the water level rises upwards towards a rectangular opening or weir passing through the wall to the Filtration Chamber.

To protect the Filtration Chamber from the floating trash, debris, and oils/grease in the runoff, the opening/weir connecting the Pretreatment to the Filtration Chamber is equipped with a full length hood (See location 4 in the drawing). This submerged hood, acts like an oil/water separator trapping floating material in the Pretreatment Chamber. This simple process protects the filter cartridges – extending their service life and allowing optimum treatment flow rates.

Water leaving the Pretreatment Chamber enters the Filtration Chamber where it is filtered through Fabco cartridges held in a permanently installed mounting plate. The treated water leaving the cartridges drops down below the mounting plate and flows directly into the Outlet Chamber where it exits the treatment process.

If the inlet hood between the Pretreatment Chamber and the Filtration Chamber becomes blocked or if the total flow rate to the StormSafe exceeds the system treatment capacity, water can bypass the internal dividing walls and into the Outlet Chamber thereby providing additional hydraulic capacity.

The StormSafe is a sub-surface Fabco stormwater vault system that utilizes Facbo’s proprietary filter media cartridges.

The external structure for the StormSafe is a concrete precast product that can have a round or rectangular shape depending on many things, including: treatment flow rate, required bypass flow rate, or pipe materials and elevations to name just a few of the parameters that affect the overall form and function of the filter.

Fabco typically works between the customer and a commercial concrete company located near the construction site to design and supply the vault. This allows us to optimize the design for the application while at the same time managing the costs, required modifications (if any), production time frame and delivery of the vault.

To being the design process, Fabco’s engineering group requires detailed information related to the construction site where the StormSafe will be installed and the functional stormwater treatment expected from the filter.

At a minimum, the following is required:

• Final Rim Elevation
• Invert Elevation Pipes (A 24″ offset between IN/OUT inverts is preferred for StormSafe units)
• Pipe Size and Material (HDPE, RCP, PVC, etc.)
• Orientation of Pipes into the Vault (Plan View)
• Sump Depth of the Unit (If Required)
• Targeted Pollutants
• Treatment Flow Rate (Please include any required Storm Event Specifications from the Design Engineer)
• On-line or Off-line Bypass Required
•  Site Location and Site Plan
• Expected Lead Time
• Any Competitor Unit Spec’d on plans.

The StormSafe Cartridge Filter Box is a smallest version of the StormSafe family and is normally specified with between 1 and 4 filter cartridges. This design can be used in most small vaults sizes and forms. The simplest designs consists of an aluminum box which accepts the cartridges and also include an open bypass port. In some cases a tall aluminum support frame is provided depending on the vault being used to lift the Cartridge Filter Box vertically, shown in the picture to the left.