INDUSTRY COMPONENT

Seal (Mechanical or Packing)

A mechanical or packing seal is a critical component in agitators and mixers that prevents fluid leakage between rotating shafts and stationary housings, ensuring operational integrity and environmental safety.

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Component Specifications

Definition
A mechanical or packing seal is an engineered sealing device used in agitators and mixers to contain process fluids within the vessel or housing. It operates at the interface between the rotating shaft and stationary parts, utilizing either mechanical face seals (with rotating and stationary rings) or packing materials (like braided fibers) compressed in a stuffing box. These seals maintain pressure differentials, prevent contamination, and reduce fugitive emissions, with selection based on factors such as pressure, temperature, fluid compatibility, and shaft speed.
Working Principle
Mechanical seals work by creating a tight, dynamic seal between two flat, precision-lapped faces—one rotating with the shaft and one stationary. A spring or bellows applies axial force to maintain contact, while a secondary static seal (e.g., O-ring) prevents leakage around the faces. Packing seals rely on compressed fibrous material (e.g., graphite, PTFE) in a stuffing box, which forms a seal through radial compression against the shaft, often requiring lubrication and periodic adjustment for wear.
Materials
Common materials include: For mechanical seals—carbon, silicon carbide, tungsten carbide, or alumina ceramic for faces; stainless steel (e.g., 316SS), Hastelloy, or titanium for metal parts; and elastomers like Viton, EPDM, or PTFE for secondary seals. For packing seals—braided fibers of graphite, PTFE, aramid, or asbestos-free materials, often impregnated with lubricants.
Technical Parameters
  • Size Range Shaft diameters from 10 mm to 300 mm
  • Shaft Speed Up to 5000 rpm
  • Leakage Rate <10 mg/m³ for emissions control
  • Pressure Range Up to 100 bar
  • Temperature Range -50°C to 400°C
Standards
ISO 21049, DIN 24960

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Seal (Mechanical or Packing).

mechanical seal packing seal agitator seal mixer seal shaft seal industrial sealing fluid containment ISO 21049 DIN 24960 Seal (Mechanical or Packing) Seal (Mechanical or Packing) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Agitator/Mixer

A mechanical device used to mix, blend, or agitate fluids or slurries within a tank.

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Engineering Analysis

Risks & Mitigation
  • Seal failure leading to fluid leakage and environmental contamination
  • Overheating due to inadequate lubrication or cooling
  • Shaft damage from misalignment or improper installation
  • Reduced efficiency from wear or incorrect material selection
FMEA Triads
Trigger: Improper installation or misalignment
Failure: Premature seal wear or leakage
Mitigation: Follow manufacturer guidelines, use alignment tools, and conduct regular inspections.
Trigger: Incompatible material with process fluid
Failure: Chemical degradation and seal failure
Mitigation: Select materials based on fluid compatibility charts and conduct material testing.
Trigger: Inadequate lubrication or cooling
Failure: Overheating and thermal damage
Mitigation: Ensure proper lubrication systems and monitor operating temperatures.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 286 for shaft and housing fits, with face flatness within 0.0006 mm for mechanical seals
Test Method
Leakage testing per API 682 for emissions, pressure testing per ISO 21049, and material certification per ASTM standards

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a mechanical seal and a packing seal?

Mechanical seals use precision faces for a leak-tight seal with minimal maintenance, ideal for high-pressure or hazardous fluids. Packing seals use compressed fibrous material, requiring adjustment and allowing slight leakage for lubrication, often used in less critical applications.

How often should seals be replaced in agitators?

Replacement intervals depend on operating conditions: mechanical seals typically last 1-5 years, while packing seals may need adjustment every few months and replacement every 6-24 months, based on wear, fluid abrasiveness, and maintenance schedules.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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