Installation | Hydrodynamic Separator
Since all Aqua-Swirl® systems are fabricated from high performance materials, the units are durable, lightweight and can be installed without the use of heavy lifting equipment. Lifting supports or cables are provided to allow easy off-loading and installation with a track-hoe. Compared to concrete systems, using an Aqua-Swirl™ can significantly reduce installation costs.
Five routine installation steps are described as follows:
1. Excavation and Bedding
The trench and trench bottom shall comply with ASTM D 2321, Section 6, Trench Excavation, and Section 7, Installation. The unit is installed on a stable base consisting of Class 1 stone materials per ASTM D 2321, Section 5, Materials, and compacted to 95% proctor density.
2. Pipe Connection Devices
Manufactured stub-outs for the inlet and outlet piping are provided to allow for simple attachment of the device to the stormwater conveyance pipe with rubber couplings. Couplings to and from the Aqua-Swirl® are supplied by the contractor. Fernco, Mission, or MarMac equal type flexible boot with stainless steel tension bands or equal are typically used. A metal sheer guard will protect the flexible connector.
3. Buoyancy (if required)
All Aqua-Swirl® systems are supplied with an octagonal base plate extending at least six inches from the outside diameter of swirl chamber to provide additional surface area to counter any buoyant forces exerted on the device. Concrete can be poured directly onto the base plate if necessary to provide additional resistive force.
4. Backfill Requirements
Backfill consists of Class 1 (preferred) or Class 2 stone material per ASTM D 2321, Section 5, Materials; and, compacted to 90% proctor density. Backfill material should extend beyond the edge of the Aqua-Swirl™ to the full height of subgrade that extends laterally to undisturbed soil. Sufficient backfill should be placed over components prior to using heavy compaction or construction equipment to prevent damage. Support is provided by vertical risers to preclude vertical or lateral movements.
5. Traffic Loading
Reinforced concrete may need to be placed over the entire Aqua-Swirl® when subject to H-20 (or greater) traffic loading for HDPE models.
AquaShield™ can assist to determine if concrete is needed. Traffic rated foundry rims and covers are installed such that no contact is made between the access riser and rebar. If traffic loading is not required, it is recommended that bollards be placed around access risers in non-traffic areas to prevent inadvertent loading by maintenance vehicles.
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