INDUSTRY COMPONENT

Hub

Central mounting component connecting agitator blades to the drive shaft in chemical reactors.

Component Specifications

Definition
The hub is the critical central component of a chemical reactor agitator blade assembly that securely connects multiple blades to the rotating drive shaft. It transmits torque from the shaft to the blades while maintaining precise angular positioning and structural integrity under high mechanical stresses, corrosive environments, and varying temperature conditions. The hub's design ensures uniform blade distribution for optimal mixing efficiency and prevents blade detachment during operation.
Working Principle
The hub functions as a torque-transmitting interface between the rotating drive shaft and agitator blades. It converts rotational energy from the shaft into mechanical motion of the blades through rigid mechanical coupling. The hub maintains fixed angular relationships between blades to create controlled fluid dynamics patterns within the reactor vessel, ensuring consistent mixing, heat transfer, and chemical reaction efficiency.
Materials
Stainless steel (316/316L), Hastelloy C-276, Titanium Grade 2, Duplex stainless steel (2205), Nickel alloys (Inconel 625), with surface treatments: passivation, electropolishing, or specialized coatings for corrosion resistance.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Bolt PatternISO metric or ANSI/ASME standard
Mounting TypeKeyed, Splined, or Taper-lock connection
Diameter Range150-800 mm
Surface FinishRa ≤ 0.8 μm for hygienic applications
Pressure RatingUp to 100 bar
Weight Capacity500-5000 kg per blade attachment point
Operating Temperature-50°C to 400°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 2852, DIN 11864, ASME BPE, EHEDG

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Corrosion failure in aggressive chemical environments
  • Fatigue cracking from cyclic loading
  • Improper installation causing imbalance
  • Galvanic corrosion with dissimilar metals
  • Creep deformation at elevated temperatures
FMEA Triads
Trigger: Stress corrosion cracking in chloride environments
Failure: Catastrophic hub fracture leading to blade detachment
Mitigation: Use duplex stainless steel or nickel alloys, implement regular NDT inspections, control process chemistry to minimize chloride concentration
Trigger: Improper bolt torque during installation
Failure: Loosening of blade attachments causing vibration and imbalance
Mitigation: Use calibrated torque wrenches, follow manufacturer specifications, implement torque verification procedures during maintenance
Trigger: Cavitation erosion in high-speed applications
Failure: Material loss and structural weakening of hub surfaces
Mitigation: Design with adequate wall thickness, use cavitation-resistant materials, operate below critical speed thresholds

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.05 mm for bore diameter, ±0.1° for angular positioning, Ra ≤ 0.8 μm surface finish for hygienic applications
Test Method
Dimensional verification with CMM, material certification per ASTM/EN standards, pressure testing per ASME BPVC, NDT (UT/MPI) for defect detection

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Hub

Manufacturer profiles associated with Hub.

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Frequently Asked Questions

What is the primary function of an agitator blade hub?

The hub serves as the central connection point that transmits rotational force from the drive shaft to multiple agitator blades while maintaining their precise angular positioning for effective fluid mixing.

How do I select the right material for a chemical reactor hub?

Material selection depends on the chemical process: stainless steel for general applications, nickel alloys for extreme corrosion resistance, and specialized coatings for abrasive or high-temperature environments. Consider pH, temperature, pressure, and chemical compatibility.

What maintenance is required for agitator hubs?

Regular inspection for corrosion, crack detection (dye penetrant or ultrasonic testing), bolt torque verification, and alignment checks. Replacement typically occurs during major reactor overhauls every 3-5 years depending on service conditions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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