Tank mixing system

The Rotamix nozzle tank mixing system has no moving parts inside the tank. It uses fixed nozzle assemblies and once the nozzle assemblies are installed, the nozzles are adjusted to the factory specified angle and permanently tightened. No additional adjustment is required.

Nozzle assemblies are offered in single and double configurations, depending on tank diameter and depth. The systems can be installed in tanks up to 30 m diameter and also rectangular tanks.

All fittings are ductile cast iron and glass lined for abrasion resistance, reduced friction, and to eliminate Struvite adhesion. The tapered nozzle barrels are 25 mm thick for long-term wear protection. The entire assembly is white metal sandblasted, and then powder coated with 3M Scotchkote Fusion Bonded Epoxy Coating, a one-part, heat-curable, thermosetting epoxy coating for good surface protection.

The flow pattern created by the system eliminates dead spots, reduces energy requirements and virtually eliminates solids settling out inside the tank. It uses an externally mounted Vaughan Chopper Pump that will handle solids ladened materials and sludges containing rags, fibres and hair and stops the problem of fine fibres and hair reweaving into small clumps inside the tank. The system can also be retrofitted to existing digesters, sludge tanks, industrial process tanks, storage tanks and chemical tanks.

All Rotamix designs are supported by CFD analysis, either by standard modelled geometries, or using customised models designed to meet specific application parameters on a consultation basis.

The nozzles require no maintenance and the system can be used to fill and/or empty the mixing tank.

Typical applications include mixing anaerobic digesters, sludge storage tanks, sludge blending tanks, industrial storage tanks, chemical tanks, pulp and paper black liquor tanks, liquid fertiliser tanks, waste containment tanks in refineries and solids resuspension tanks in the mining industry.