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Side Tank Mixer
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Side Entry Tank Mixers

Side Entry Tank Mixers are powerful agitation systems mounted horizontally through the side wall of storage tanks and process vessels.
They are designed to efficiently mix large volumes of liquids, slurries, and suspended solids while maintaining uniform temperature and preventing sedimentation.

What Are Side Entry Tank Mixers?

These mixers feature a robust shaft and impeller assembly that enters the tank from the side, usually near the bottom.
The impeller generates strong radial and axial flow patterns that keep tank contents well-mixed without the need for top-mounted equipment.

They are widely used in industries requiring continuous or intermittent agitation of large storage tanks, including oil & gas, petrochemical, water treatment, pulp & paper, and chemical processing.

Key Benefits

Large Volume Mixing Ideal for mixing tanks ranging from 1,000 to over 1,000,000 gallons.
Space Saving Side-entry design leaves the tank top free for instrumentation, access hatches, and filling lines.
Energy Efficient Optimized impeller designs deliver excellent mixing with lower power consumption.
Easy Maintenance Many models feature a shut-off seal that allows maintenance without draining the tank.

Side Entry Tank Mixers are the preferred solution when high-volume, reliable agitation is needed in large storage or process tanks.

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Side Entry Tank Mixers are heavy-duty agitation systems designed for large-scale storage tanks and process vessels.
Mounted horizontally through the side wall of the tank, they deliver powerful and efficient mixing for liquids, slurries, and suspensions while maintaining uniform temperature and preventing solids from settling at the bottom.

What Are Side Entry Tank Mixers?

Unlike top-entry mixers that require overhead space and structural support, side entry mixers enter the tank from the side, usually near the bottom.
They consist of a robust shaft, high-efficiency impeller (typically hydrofoil or pitched blade), mechanical seal or shut-off device, and a heavy-duty drive assembly (gearbox + motor).

The impeller creates strong radial and axial flow patterns that sweep across the tank floor and circulate the entire contents. This design is particularly effective for very large tanks (from 10,000 to over 1,000,000 gallons) where top-entry mixers would be impractical or excessively expensive.

Key Benefits

Space Efficient Frees up the tank roof for instrumentation, access hatches, and filling lines.
Excellent for Large Volumes Ideal for tanks ranging from 10,000 gallons to over 1 million gallons.
Energy Efficient High-efficiency hydrofoil impellers deliver superior mixing with lower power consumption.
Easy Maintenance Many models include a shut-off seal or stuffing box, allowing maintenance without draining the tank.
Versatile Applications Suitable for blending, suspension, heat transfer, and homogenization in a wide range of industries.

Common Industries & Uses

  • Oil & Gas: Crude oil blending, fuel oil storage, and additive mixing
  • Petrochemical & Chemical: Maintaining homogeneity in large storage tanks
  • Water & Wastewater Treatment: Sludge suspension and chemical mixing
  • Pulp & Paper: Stock chest agitation and pulp blending
  • Food & Beverage: Syrups, juices, and liquid ingredient blending (sanitary models)
  • Power Generation: Limestone slurry and FGD (Flue Gas Desulfurization) tanks

Side Entry Tank Mixers are the preferred solution when high-volume, continuous agitation is required in large tanks where top-entry mixers would be structurally challenging or cost-prohibitive.
Their side-mounted design, combined with modern high-efficiency impellers, delivers excellent mixing performance with lower installed costs and easier maintenance access.

Size

8", 10", 12", 18", 24"
Impellar Type

hydrofoil, Propeller, Axial Flow Turbine, Folding, Dispersion, Ultra Shear Dispersion

Specifications

Side Entry Tank Mixers are robust, horizontally mounted agitators designed for large storage tanks and process vessels.
They deliver powerful mixing performance while minimizing structural requirements on the tank roof.

Technical Specifications

Parameter Specification Notes
Mounting Type Side Entry (Horizontal) Through tank sidewall
Tank Size Range 1,000 gallons to over 1,000,000 gallons Custom designs available
Power Range 0.5 HP to 75 HP (0.37 kW to 55 kW) Higher power on request
Impeller Types Hydrofoil (high efficiency), Pitched Blade, Propeller Hydrofoil most common for blending
Shaft Length Custom – typically up to 15 ft (4.5 m) inside tank Designed to reach optimal mixing zone
Materials of Construction 316L Stainless Steel, Carbon Steel with coatings, Duplex Stainless, Hastelloy (on request) Wetted parts selected for chemical compatibility
Sealing Options Single mechanical seal, Double mechanical seal, Stuffing box with shut-off device Shut-off seal allows maintenance without tank draining
Speed Range Fixed speed or Variable Frequency Drive (VFD) Typically 30 – 300 RPM
Mounting Flange ANSI or DIN flanged (4″ to 12″ common) Custom flanges available
Applications Crude oil blending, fuel oil storage, wastewater, chemical storage, pulp chests, FGD tanks, and large volume homogenization Ideal for tanks where top entry is impractical

Side Entry Tank Mixers are engineered for continuous duty in large tanks.
Their design allows easy access for maintenance and provides excellent mixing performance with lower installed costs compared to top-entry mixers on very large vessels.

Power vs. Viscosity

Power Requirement vs. Viscosity

Side Entry Tank Mixer – 10 HP to 50 HP Models
Typical Large Storage Tanks (10,000 – 200,000+ Liters)

Typical Power Consumption Curve – Side Entry Tank Mixer

Viscosity (cP)     |   Power Required (HP)
─────────────────────────────────────────────
1             |    5.0  (Efficient Hydrofoil Impeller)
10             |    6.5
100             |    9.0
1000             |   13.5  ← Typical Design Point
5000             |   20.0
10000            |   28.0  (Heavy-Duty Configuration)
20000+            |   35+  (Requires larger motor or multiple impellers)

Side Entry Mixers are optimized for large storage tanks. Power demand increases significantly with viscosity.
Recommended operating range: Up to 15,000 cP for standard configurations.

Key Notes on Power vs. Viscosity for Side Entry Tank Mixers

  • Side Entry Mixers are highly efficient for large-volume, low-to-medium viscosity applications (e.g., crude oil blending, fuel storage, water storage).
  • Hydrofoil impellers provide excellent flow with lower power consumption in low-viscosity fluids.
  • As viscosity increases, power requirement rises sharply — gear reducers and larger motors are often needed above 5,000 cP.
  • Side entry design allows easier maintenance without emptying the tank, but proper shaft alignment is critical to avoid vibration.
  • Variable Frequency Drives (VFDs) are strongly recommended to optimize power usage across different batch viscosities.
  • For very high viscosity or heavy sludge, multiple side-entry mixers or special impeller designs may be required.

Side Entry Tank Mixers are the preferred choice for large storage tanks where top-entry mixers would require excessively long shafts.
Proper sizing based on viscosity is essential to achieve good mixing while keeping energy consumption reasonable.

For accurate power calculations based on your exact tank size, fluid properties, specific gravity, and desired mixing result, consult the manufacturer for a custom engineering analysis.

Installation Procedures

Proper installation of Side Entry Tank Mixers is critical for safe operation, optimal mixing performance, and long service life.
Incorrect installation can cause vibration, seal failure, or poor mixing. Follow these detailed procedures carefully.

Installation Procedures for Side Entry Tank Mixers

Step Installation Procedure Tools / Materials Required Safety & Important Notes
1 Verify tank nozzle location and orientation. The mixer should be installed near the bottom of the tank (typically 1/4 to 1/3 of tank height from the floor) and positioned to create effective flow across the tank floor. Tank drawings, level gauge Incorrect height or angle will result in dead zones and poor mixing.
2 Shut down the tank, isolate, drain if necessary, and follow lockout/tagout (LOTO) procedures. Depressurize and vent the tank completely. Lockout/Tagout kit, blinds, venting equipment Never work on a pressurized or partially filled tank.
3 Clean the tank nozzle and mating surfaces thoroughly. Install the mixer mounting flange with proper gasket and torque bolts in a criss-cross pattern to manufacturer specifications. Gaskets, torque wrench, cleaning tools Use only compatible gasket material for the process fluid.
4 Insert the shaft and impeller assembly through the tank nozzle. Carefully align and secure the drive unit (gearbox + motor) to the mounting flange. Lifting equipment (crane or hoist), alignment tools Use proper lifting points to avoid damaging the shaft or seal.
5 Install the mechanical seal or stuffing box and connect all seal flush lines (if equipped). Perform a seal leakage test before filling the tank. Seal flush system components, pressure test kit Ensure seal flush liquid is compatible with process fluid.
6 Connect electrical power to the motor and install the coupling guard. Verify correct rotation direction (usually clockwise when viewed from the motor end). Electrical tools, rotation checker Incorrect rotation will severely reduce mixing efficiency.
7 Slowly fill the tank and monitor for leaks at all connections and the mechanical seal. Check for excessive vibration during initial operation. Pressure gauge, vibration monitoring tools Do not run dry. Ensure minimum liquid level covers the impeller.
8 Document all installation details, torque values, alignment readings, and initial test results in the equipment log. Include photos of the installation. Installation checklist, camera Record serial number, impeller size, and motor data.

Important Note: Side Entry Tank Mixers must be installed by qualified personnel following manufacturer guidelines and applicable safety standards.
Proper alignment, correct rotation direction, and adequate tank support are critical. Always maintain the minimum liquid level to keep the impeller fully submerged during operation.

Maintenance Procedures

Side Entry Tank Mixers are robust, heavy-duty machines, but they still require regular maintenance to ensure reliable performance, prevent seal failure, and maximize service life.
A well-planned maintenance schedule helps avoid unexpected downtime and costly repairs.

Maintenance Procedures for Side Entry Tank Mixers

Maintenance Task Procedure & Frequency
Daily / Visual Inspection • Check for unusual noise or vibration during operation
• Inspect for leaks at the mechanical seal and flange connections
• Verify motor and gearbox temperatures are normal
Weekly Inspection • Check oil level in the gearbox (if oil-lubricated)
• Inspect coupling guard and mounting bolts for tightness
• Look for signs of shaft movement or misalignment
Monthly Maintenance • Grease bearings (if grease-lubricated) per manufacturer schedule
• Check and tighten all foundation and mounting bolts
• Inspect the impeller for damage or wear (if accessible)
Quarterly / Semi-Annual • Change gearbox oil (if applicable) using recommended lubricant
• Inspect and clean the mechanical seal flush system
• Check shaft runout and alignment
Annual / Major Maintenance • Perform full mechanical seal inspection or replacement
• Inspect and replace bearings if needed
• Remove and inspect impeller for erosion, corrosion, or damage
• Check and realign the entire drive train if necessary
Shutdown / Long-Term Storage • Drain and flush the seal chamber
• Coat exposed shaft and impeller with protective oil or grease
• Rotate the shaft manually every 30 days during storage

Important Note: Always follow the manufacturer’s specific maintenance manual and lubrication schedule for your Side Entry Tank Mixer model.
Many mixers feature a shut-off seal or cartridge seal design that allows maintenance without draining the tank.
Proper and timely maintenance significantly extends seal and bearing life while preventing costly unplanned shutdowns.

Q&A

Question Answer
What is a Side Entry Tank Mixer? A Side Entry Tank Mixer is a horizontally mounted agitator installed through the side wall of a storage tank or process vessel. It uses a shaft and impeller to provide powerful mixing in large-volume tanks where top-entry mixers are impractical.
Why choose side entry mixers over top entry mixers? Side entry mixers save roof space, reduce structural loading on the tank top, are easier to maintain on very large tanks, and are more cost-effective for tanks over 50,000 gallons. They are ideal when the tank roof is crowded with nozzles and access points.
What industries commonly use side entry tank mixers? They are widely used in Oil & Gas (crude oil blending), Petrochemical, Water & Wastewater Treatment, Pulp & Paper, Power Generation (FGD tanks), Chemical Storage, and Food & Beverage industries.
What types of impellers are used? The most common are high-efficiency hydrofoil impellers for blending and suspension. Pitched blade and propeller impellers are also used depending on the viscosity and specific mixing requirements.
How is maintenance performed without draining the tank? Many side entry mixers are equipped with a shut-off seal or “stuffing box with isolation” feature. This allows the gearbox and seal to be serviced while the tank remains full and under pressure.
What is the typical power range? Side entry mixers typically range from 0.5 HP to 75 HP (0.37 kW to 55 kW), with larger custom units available for very large tanks.
Can side entry mixers handle corrosive or abrasive fluids? Yes. Wetted parts can be constructed from 316L Stainless Steel, Duplex Stainless, Hastelloy, or coated carbon steel to match the chemical compatibility and abrasion requirements of the process.
How do I determine the correct mixer size for my tank? Sizing depends on tank diameter, liquid height, viscosity, specific gravity, and desired mixing time. Factors include whether the goal is blending, solids suspension, or heat transfer. Manufacturer engineering support is strongly recommended.
What sealing options are available? Common options include single mechanical seals, double mechanical seals with barrier fluid, and stuffing boxes with shut-off capability for safe maintenance without draining the tank.
Are side entry mixers suitable for hazardous areas? Yes. They can be supplied with explosion-proof motors, ATEX/IECEx certification, and special sealing systems for use in flammable or hazardous environments.

Note: Side Entry Tank Mixers are highly effective for large-volume agitation, but correct sizing, proper installation, and regular maintenance (especially of the mechanical seal and gearbox) are critical for reliable long-term performance.
Always consult the manufacturer for specific recommendations based on your tank size, fluid properties, and process requirements.

Advantages / Disadvantages

Advantages Disadvantages
  • Excellent for very large tanks (50,000 to over 1,000,000 gallons)
  • Requires much less structural support on the tank roof
  • Leaves the top of the tank free for instrumentation and access hatches
  • Lower overall installed cost compared to top-entry mixers on large vessels
  • Easy maintenance access — many models allow seal replacement without draining the tank
  • High-efficiency impellers provide excellent mixing with relatively low power consumption
  • Ideal for continuous blending, solids suspension, and temperature homogenization
  • More difficult to inspect impeller condition without draining the tank
  • Mechanical seal is a critical wear component and requires regular monitoring
  • Shaft deflection can occur in very long shafts if not properly designed
  • Typically limited to lower viscosity fluids (under 10,000 cP)
  • Requires precise alignment during installation to avoid vibration
  • Seal failure can lead to significant product loss or environmental issues
  • Not ideal for applications requiring frequent impeller changes

Note: Side Entry Tank Mixers are the preferred choice for large-volume storage and blending applications where roof space and structural loading are concerns.
Proper sizing, quality mechanical seals, and regular maintenance are key to achieving long service life and reliable performance.

Applications

Side Entry Tank Mixers are specifically designed for large-volume storage and process tanks where top-entry mixers would be structurally challenging or cost-prohibitive.
Their horizontal mounting through the tank sidewall makes them highly effective for blending, suspension, and homogenization.

Applications of Side Entry Tank Mixers

Industry / Application Typical Use Cases Purpose & Benefits
Oil & Gas Crude oil blending, fuel oil storage, condensate tanks, additive mixing Maintains homogeneity and prevents stratification in large storage tanks.
Petrochemical & Chemical Bulk chemical storage, intermediate tanks, polymer blending Ensures uniform product quality and prevents settling of solids.
Water & Wastewater Treatment Equalization tanks, sludge holding tanks, chemical mixing basins Keeps solids in suspension and ensures even chemical distribution.
Power Generation Limestone slurry tanks, FGD (Flue Gas Desulfurization) systems, cooling water basins Prevents settling and maintains uniform slurry concentration.
Pulp & Paper Stock chests, pulp storage towers, broke chests Maintains consistent pulp consistency and prevents fiber settling.
Food & Beverage Syrup storage, juice blending, liquid ingredient tanks (sanitary designs) Ensures uniform mixing while meeting hygiene requirements.
Mining & Mineral Processing Slurry storage, reagent mixing, tailings ponds Prevents solids settlement and maintains consistent slurry density.

Side Entry Tank Mixers are particularly valuable in applications involving very large tanks where installing a top-entry mixer would require expensive structural reinforcement or where roof access is limited.

Downloads

Side Entry Mixer Technical Info

Drawings

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