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Hydraulic Recirculation and Mixing Systems

The Tideflex® Hydraulic Mixing System is a multi-port, variable orifice nozzle system. The Tideflex® nozzles are variable orifice due to the flexible nozzle opening, the nozzle will only open to the area required to handle the mass flow as compared to fixed area nozzles. The discharge velocity from the Tideflex® nozzles is always optimized as it will have the minimal open area and highest discharge velocity. Mixing in these systems is defined by velocity gradient achieved, this gradient is determined by the total mass flow and the velocity discharged from each nozzle.

The Tideflex® HRMS Mixing Nozzles will only open enough to discharge the fluid relative to the mass flow. Therefore, the effective open area of the discharge varies as the flow varies. These nozzle constructions will vary in applied rigidity (sidewall thickness) so that they produce the required discharge velocity. This provides maximum discharge velocity at any discharge rate – fixed port nozzles cannot achieve this feature. Any solids of large diameter recirculated through the system will passthrough the discharge nozzles as they will expand to release the solid, then return to optimal discharge velocity.

Tideflex® has hydraulically tested all of the mixing nozzle sizes and constructions for confirmation of the discharge velocities produced at various nozzle constructions. These tests were conducted by independent laboratories.

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Description

The key to the Tideflex® Mixing System (TMS) is the Tideflex® Check Valve. Developed in the 1980s from a United States EPA grant, the check valve was created to solve backflow problems in outfall pipes. Tideflex® engineers further expanded the use of the Tideflex® Check Valve by developing it into a Variable Orifice Inlet Nozzle that provides superior mixing characteristics when compared to a fixed-diameter pipe.

When used in the TMS, the Tideflex® Variable Orifice Nozzles optimize jet velocity at all flow rates and discharge an elliptically shaped jet, achieving rapid and complete mixing and improving water quality. The TMS also separates the inlet and outlet with one manifold pipe, eliminating short-circuiting, water stagnation, dead zones and stratification.

The ingenious design of the TMS requires no maintenance and uses the energy of the fill and draw cycles, so there is no need for an outside energy source. Given the maintenance burden of distribution systems already placed on water utilities, the TMS eliminates maintenance and inspection requirements associated with mechanical mixers. The TMS has been extensively CFD and scale modeled for every tank style, and is validated to improve water quality by owner-conducted field sampling and monitoring of parameters such as temperature, residual, TTHM, HAAS, pH, DO, nitrites, nitrates and HPC.

For any size and style of tank, Tideflex® engineers can determine the optimum TMS configuration (based on CFD and scale modeling) and run Manifold Hydraulics Mixing Analysis Models. The Mixing Analysis shows the owner exactly how much tank turnover is required to achieve complete mixing. For existing tanks, Red Valve reverse engineers the TMS to ensure complete mixing based on how the tank is actually being fluctuated.

Tideflex® Variable Orifice Nozzles and Waterflex Outlet Check Valves are NSF 61 Certified.