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Stormceptor ® EF Owner's Manual
OVERVIEW
The Stormceptor ® EF is a continuation and evolution of the most globally recognized oil-grit separator
(OGS) stormwater treatment technology - Stormceptor ®. Also known as a hydrodynamic separator,
the enhanced ow Stormceptor EF is a high performing oil-grit separator that effectively removes a
wide variety of pollutants from stormwater and snowmelt runoff at higher ow rates as compared to the
original Stormceptor. Stormceptor EF captures and retains sediment (TSS), free oils, gross pollutants and
other pollutants that attach to particles, such as nutrients and metals. Stormceptor EF’s patent-pending
treatment and scour prevention technology and internal bypass ensures sediment is retained during all
rainfall events..
Stormceptor EF offers design exibility in one simplied platform, accepting stormwater ow from a single
inlet pipe, multiple inlet pipes, and/or from the surface through an inlet grate. Stormceptor EF can also
serve as a junction structure, accommodate a 90-degree inlet to outlet bend angle, and be modied to
ensure performance in submerged conditions. With its scour prevention technology and internal bypass,
Stormceptor EF can be installed online, eliminating the need for costly additional bypass structures.
OPERATION
• Stormwater enters the Stormceptor upper chamber through the inlet pipe(s) or a surface inlet grate.
A specially designed insert reduces the inuent velocity by creating a pond upstream of the insert’s
weir. Sediment particles immediately begin to settle. Swirling ow sweeps water, sediment, and
oatables across the sloped surface of the insert to the inlet opening of the drop pipe, where a
strong vortex draws water, sediment, oil, and debris down the drop pipe cone.
• Inuent exits the cone into the drop pipe duct. The duct has two large rectangular outlet openings
as well as perforations in the backside and oor of the duct. Inuent is diffused through these
various opening in multiple directions and at low velocity into the lower chamber.
• Free oils and oatables rise up and are trapped beneath the insert, while sediment settles to the
sump. Pollutants are retained for later removal during maintenance cleaning.
• Treated efuent enters the outlet riser, moves upward, and discharges to the top side of the insert
downstream of the weir, where it ows out the outlet pipe.
• During intense storm events with very high inuent ow rates, the pond height on the upstream side
of the weir may exceed the height of the weir, and the excess ow passes over the top of the weir
to the downstream side of the insert, and exits through the outlet pipe. This internal bypass feature
allows for online installation, avoiding the cost of additional bypass structures. During bypass,
the pond separates sediment from all incoming ows, while full treatment in the lower chamber
continues at the maximum ow rate.
• Stormceptor EF’s patent-pending enhanced ow and scour prevention technology ensures
pollutants are captured and retained, allowing excess ows to bypass during infrequent, high
intensity storms.
