Overview
What is a Bottom Entry Agitator?
A bottom entry agitator is a tank-mounted agitator installed at the base of a process vessel, where torque is transmitted upward into the fluid mass through a vertical shaft and impeller assembly.
Minimises shaft deflection
Shaft support geometry keeps deflection low even at high torque.
Enables high torque at controlled RPM
Engineered for demanding, low-speed, high-torque duty cycles.
Eliminates bottom sediment dead zones
Bottom-driven flow eliminates sediment build-up at the tank base.
Improves full-volume circulation
Even mixing across the entire vessel, not just the impeller zone.
As a trusted Bottom Entry Agitators manufacturer in India, we engineer bottom-mounted mixers specifically for demanding industrial mixing equipment applications.
Mechanics
How does a bottom-mounted mixer work?
Mechanical configuration
The motor and gearbox are mounted beneath the tank bottom plate. Torque is transmitted upward through a precision-aligned agitator shaft to a hydraulically optimised impeller.
Flow pattern
Depending on process requirements, the impeller generates axial or radial flow, ensuring homogeneous process vessel mixing.
Sealing & protection
Mechanical seals (single or double cartridge) prevent leakage under pressure and temperature variations. Structural integrity is validated through:
- Critical speed analysis
- Bending moment calculation
- Shaft stress modelling
- Bearing load verification
Capabilities
Engineering performance specifications
Industrial buyers evaluate performance numerically. Our bottom entry agitators are engineered within the following typical ranges.
75,000 NmTorque capacity
(customisable)
10–300RPM operating range
500 KL+Tank capacity, from 1
KL
150 HPMotor power, from 2
HP
25 barSeal pressure rating
Request a torque and load evaluation
All agitator design calculations are performed based on viscosity profiling, density evaluation, and Reynolds number assessment.
Request a torque and load evaluation for your process parameters.
Selection guide
Bottom entry vs top entry — engineering comparison
| Parameter | Bottom entry | Top entry |
|---|---|---|
| Torque transmission | Directly at the fluid base | Distributed over the shaft length |
| Shaft deflection risk | Low | Higher in tall tanks |
| Dead zone control | Excellent | Moderate |
| Maintenance access | Bottom-mounted | Top-mounted |
| Energy efficiency | High in viscous fluids | Lower in heavy slurry systems |
Bottom entry systems are typically selected when mixing reliability and sediment suspension are critical. See Top Entry Agitators if your tank geometry favors a top-mounted drive.
Process
Engineering design workflow
As a structured Bottom Entry Agitators manufacturer in India, our workflow includes:
1
Process data collection
Viscosity, solids %, density, temperature and pressure.
2
Tank geometry analysis
Height-to-diameter ratio, baffles and mounting thickness.
3
Agitator Design calculation
Torque modelling, impeller sizing and power number calculation.
4
Mechanical simulation
Shaft stress validation and resonance avoidance.
5
Material & seal selection
SS316, Duplex, Hastelloy, abrasion-resistant coatings.
6
Fabrication & FAT
Runout inspection, vibration checks, seal testing.
7
Installation & commissioning Support
On-site supervision and alignment verification.
Request a process-specific design evaluation for your industry.
Industries
Industry applications
As an experienced Bottom Entry Agitators manufacturer in India, we design systems for sector-specific challenges.
| Industry | Process challenge | Our solution | Performance benefit |
|---|---|---|---|
| Fertilisers & agrochemicals | Slurry sedimentation and corrosive environments. | Continuous bottom-driven suspension prevents nutrient settling. | Uniform slurry concentration and reduced tank cleaning cycles. |
| Oil & gas | Crude stratification and sludge deposition. | Bottom circulation eliminates sediment buildup. | Improved density consistency and extended tank life. |
| Adhesives & sealants | High viscosity and shear sensitivity. | Low RPM, high torque mixing. | Stable rheology and improved product uniformity. |
| Paint & coatings | Pigment sedimentation. | Axial flow impellers for full suspension. | Improved colour consistency and batch repeatability. |
| Water & wastewater Treatment | Sludge thickening and stagnation. | Bottom-mounted mixing eliminates dead zones. | Improved homogenisation and lower maintenance cycles. |
| Plastics & polymers | High-density melt handling. | Stable torque transmission and controlled shear. | Uniform blending and thermal consistency. |
| Electric Vehicles (EVs) and Battery Manufacturing | Lithium slurry nano-particle settlement. | Precision agitation for particle suspension. | Improved electrode coating uniformity. |
Reference
Visual orientation & installation reference
A bottom entry agitator is installed beneath the tank base, with the drive assembly positioned externally. The shaft penetrates a sealed mounting flange and extends upward into the tank.
In large tanks, multiple bottom-mounted mixers may be installed symmetrically to ensure uniform flow distribution.
- Motor & gearbox — outside the tank (bottom)
- Mechanical seal — mounted at the tank base
- Shaft — vertical, upward orientation
- Impeller — near the tank bottom clearance
Support
Common Industrial Mixing Problems We Solve
Mixing issues we resolve
- Poor suspension in high-viscosity fluids
- Seal leakage under pressure
- Shaft vibration and deflection
- Energy inefficiency in large tanks
- Maintenance downtime from complex seal systems
Regional industrial support
We support process industries across Pune, Pimpri-Chinchwad, Talegaon, Chakan and the wider Maharashtra industrial belt, with local consultation and plant-level evaluation.
FAQs
Frequently asked questions
Most industrial applications operate between 10–300 RPM. High-viscosity fluids require lower RPM with higher torque output.
Yes. Systems can be supplied with flameproof motors, ATEX-compliant configurations and explosion-proof sealing systems.
Torque is calculated using viscosity, density, impeller diameter, power number and Reynolds number, with sufficient margin for startup and steady-state operation.
Routine seal inspection, bearing lubrication checks, vibration monitoring and periodic alignment verification. Cartridge seals simplify replacement.
Yes. Duplex steel, hard-facing coatings and abrasion-resistant impellers improve durability in abrasive environments.
- 15+ years of industrial mixing engineering expertise
- Custom-engineered bottom-mounted mixers
- Proven installations across India
- Engineering-first approach to process reliability
As a reliable manufacturer of Bottom Entry Agitators in India, we deliver technically sound, performance-driven industrial mixing equipment designed for long-term operational efficiency.