Drum Mixers
Drum mixers are designed for blending, agitation, suspension, or remixing materials directly in standard 55-gallon drums. To accommodate varying processing requirements and facility layouts, INDCO offers a complete range of mounting styles, power sources, drive configurations, and mixing impellers. Proper equipment selection depends on factors such as liquid viscosity, liquid density, container openings, available plant utilities, and overall mixing objectives. Learn More
Selecting an efficient drum mixer requires matching product design features to your process parameters:
- Drum Opening and Mounting: Determine whether your application calls for a bung-entering design that screws directly into a 2" NPT bung, a portable clamp-mount unit for open-head drums, or a full drum lid mount to minimize vapor escape and splashing.
- Power Source: Electric motors are available in Totally Enclosed Fan Cooled (TEFC), Totally Enclosed Non-Ventilated (TENV), and Explosion-Proof (EP) enclosures — provide steady, reliable power. Air-powered models offer variable speed operation using simple air control valves and are naturally spark-free.
- Drive Type: Direct-drive mixers (1,750 RPM electric or up to 3,000 RPM air) emphasize high fluid velocity and low-viscosity agitation. Gear-reduced designs (typically 350-RPM electric or 60-600-RPM air) use gear reducers to maximize torque for heavy, viscous materials.
- Horsepower: Motor power ranges from 1/4 HP for light fluids up to 4 HP for demanding industrial batches. Horsepower must be evaluated alongside viscosity, impeller load, and target batch turnover rate.
- Container Compatibility: Always verify internal drum dimensions, opening clearance (e.g., standard 2" bungs require collapsible folding impellers), and required shaft length to ensure bottom clearance.
Fluid viscosity directly influences fluid resistance and flow dynamics during agitation. Standard water-like materials (1 centipoise or cP) or light oils require higher shear speeds provided by direct-drive impellers. Conversely, heavy materials such as polymers, thick coatings, or resins resist flow and require the high torque delivered by gear-reduced drives equipped with larger axial hydrofoils or folding impellers.
Selecting the right impeller affects overall batch turnover, flow patterns, and motor stress. Common industrial processes served by INDCO drum mixers include:
- Blending miscible liquids
- Maintaining heavy solids in uniform suspension
- Remixing settled resins, pigments, or chemicals prior to use
- Processing chemical solutions
- Agitating industrial paints, inks, and coatings
- Mixing food-grade and pharmaceutical process materials
For detailed guidance on sizing equipment for viscous fluids, consult INDCO’s Principles for High-Viscosity Mixing guide.
Specialized operating environments require strict compliance with safety and sanitary standards:
- Sanitary Mixer Configurations: For applications demanding strict cleanability, INDCO offers sanitary mixers fabricated from 316 stainless steel with polished finishes. These models withstand high-pressure cleaning and detergents, with many options appearing on the USDA list of accepted equipment for food-processing plants.
- Explosion-Proof Options: Facilities processing flammable vapors, solvents, or combustible dusts require Class I or Class II explosion-proof electric motors or intrinsically safe air motors.
What type of mixer is best for a 55-gallon drum?
The ideal choice depends on drum construction and fluid viscosity. Closed-head drums with 2" bungs require bung-entering mixers with collapsible folding impellers. Open-head drums accept clamp-mounted mixers or heavy-duty drum lid mixers that cover the vessel during operation.
How do I choose between a direct-drive and gear-reduced drum mixer?
Choose direct-drive models (1,750 RPM) for thin, water-like liquids that require fast mixing and high shear. Choose gear-reduced models (typically 350 RPM) for thicker liquids, slurries, or settled solids requiring high torque and gentle pumping action.
What drum mixer should I use for high-viscosity materials?
High-viscosity materials are usually best handled with a gear-driven mixer. Impeller, motor, and gearbox selection are critical to ensure equipment longevity while meeting your processing requirements. Refer to INDCO's high-viscosity mixing principles for technical sizing guidance.
What is the difference between a bung mount, clamp mount, and drum lid mixer?
- Bung Mount: Screws directly into a standard 2" NPT drum opening.
- Clamp Mount: Clamps onto the rim of open drums or tanks, allowing angle adjustments.
- Drum Lid Mount: Replaces the standard drum cover entirely, supporting the motor directly over the center of the drum.
How do I choose an impeller for a drum mixer?
Match impeller design to container access and process goals. Marine-style propellers and axial hydrofoils offer efficient fluid flow in open drums, folding impellers expand upon rotation to pass through narrow bungs, and dispersion blades deliver high shear for powder wetting.
Selecting the optimal mixer depends on your exact application parameters:
- Drum or container geometry and top openings
- Fluid viscosity and specific gravity
- Batch volume and target turnover time
- Desired process result (suspension, blending, dispersion, or heating)
- Facility power supply and hazardous area requirements
Need technical support selecting the right drum mixer? Contact INDCO's application engineers or call us directly at 1-800-851-1049. You can also easily complete our mixer sizing form for personalized equipment guidance.