Seal/Gland: Temperature Range -40°C to 400°C

Q: What is the difference between mechanical seals and gland packing?

Mechanical seals use precision lapped faces for near-zero leakage with minimal maintenance, while gland packing uses compressed fibrous material requiring periodic adjustment and allowing controlled leakage for lubrication.

Q: How often should agitator seals be replaced?

Mechanical seals typically last 2-5 years with proper operation; gland packing requires adjustment every 3-6 months and replacement every 1-2 years depending on operating conditions and media.

Component Specifications

Definition

A precision-engineered sealing component designed to maintain a pressure-tight barrier between the rotating shaft of an agitator and its stationary housing, preventing process fluid leakage, contamination, and environmental release while accommodating shaft movement and wear.

Working Principle

Creates a controlled interface between rotating and stationary surfaces using either mechanical face seals (with spring-loaded mating rings) or gland packing (compressed fibrous material) that generates friction-based sealing through axial compression, with lubrication often required to reduce heat and wear.

Materials

Mechanical seals: Carbon graphite, silicon carbide, tungsten carbide, stainless steel (316SS), elastomers (FKM, EPDM). Gland packing: Braided graphite, PTFE-impregnated fibers, aramid fibers, flax. Gaskets: Compressed non-asbestos fiber (CNAF), rubber.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Speed	Up to 3600 rpm
Leakage Rate	< 1 g/hr for mechanical seals
Pressure Rating	Up to 25 bar
Temperature Range	-40°C to 400°C
Seal Face Flatness	< 0.9 μm
Shaft Diameter Range	10-200 mm

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 21049, API 682, DIN 24960, ANSI/B93.55

Parent Products

This component is used in the following industrial products

Agitator (optional)

An optional mechanical device used to mix, blend, or homogenize the contents of a chemical storage tank.

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Engineering Analysis

Risks & Mitigation

Seal failure causing product contamination
Shaft damage from improper installation
Overheating due to insufficient lubrication
Environmental leakage of hazardous fluids

FMEA Triads

Trigger: Abrasive particles in process fluid
Failure: Accelerated seal face wear leading to leakage
Mitigation: Install upstream filtration, use hard-faced seal materials (silicon carbide), implement flush plans

Trigger: Improper gland packing compression
Failure: Excessive leakage or shaft overheating
Mitigation: Follow manufacturer torque specifications, use compression measurement tools, implement regular adjustment schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Shaft runout < 0.05 mm TIR, squareness < 0.1 mm/m, shaft finish 0.4-0.8 μm Ra

Test Method

Hydrostatic pressure testing per ISO 21049, helium leak testing for critical applications, performance validation with actual process media

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 Seal/Gland

Manufacturer profiles associated with Seal/Gland.

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Frequently Asked Questions

What is the difference between mechanical seals and gland packing?