An agitator or mixer is an essential component of chemical storage tanks designed to ensure uniform distribution of chemical components, prevent phase separation, maintain consistent temperature and concentration gradients, and enhance chemical reactions when required. It operates within the tank's interior to provide mechanical mixing action. The device typically consists of a motor-driven shaft with impellers or blades that rotate within the tank, creating fluid motion through shear forces, turbulence, or laminar flow patterns to achieve mixing objectives. Available materials include stainless steel (316L/304), carbon steel, Hastelloy, titanium, and fiberglass reinforced plastic. Key parameters to consider when selecting an agitator include tank capacity (100–50000 L), agitator speed (10–300 rpm), motor power (0.75–75 kW), operating temperature (-20–150 °C), operating pressure (1.0–1.6 MPa), shaft diameter (25–150 mm), impeller diameter (200–2000 mm), material of wetted parts (304/316L per ASTM A240), seal type (single or double), ingress protection (IP54–IP65 per IEC 60529), voltage (220–480 V AC), frequency (50/60 Hz), and weight (50–2000 kg). These values are reference ranges and must be confirmed for the specific model and application. The agitator is a component that interfaces with the tank, motor, and control system. Proper selection requires input on process requirements, tank geometry, and fluid properties. Verification questions include checking the material certificate, seal compatibility, and motor ratings. Maintenance signals include unusual noise, vibration, or reduced mixing performance. Failure boundaries include seal leakage, shaft bending, or impeller damage. Always verify model-specific values and standards with the legal manufacturer or supplier.
The agitator operates by rotating a shaft with impellers or blades inside the tank. The motor drives the shaft, and the impellers impart momentum to the fluid, creating flow patterns such as axial or radial flow. This motion promotes mixing through shear forces, turbulence, or laminar flow, depending on the impeller design and speed. The result is homogenization of the contents, prevention of settling, and enhanced heat or mass transfer. The specific mixing action depends on the impeller type, speed, and tank geometry.
