A. The mixing system consists of a nozzle mounted in a submersible stainless-steel casing. The system is lowered to the tank floor and creates a vertical flow pattern inside the tank. Devices with an externally mounted pump shall not be acceptable. Mixer operation shall be independent of tank drain and fill cycles to ensure constant mixing. Mixer shall weigh less than 40 lbs. (~18 kg) and be able to be hoisted, installed, and/or removed by on-site personnel without additional equipment needed, and so that there is no crush hazard or entanglement hazard present, and so that weight of mixer on tank floor does not cause damage to interior coating. B. Mixing system inlet shall be elevated at a minimum of 6” above tank floor to avoid disturbing accumulated tank sediment or entraining particles and causing accelerated wear of moving parts. C. Mixers using submersible pump with slit or “water sheet” or horizontal motor mounting designs are not acceptable. D. Mixers shall include a buoyancy mechanism to keep nozzle pointing upright no matter the angle of the tank floor
