Top Disc: Diameter 200-800 mm, Thickness 1.5-4.0 mm

Component Specifications

Definition

The top disc is the uppermost conical disc in a disc stack centrifuge assembly, typically made of high-strength stainless steel or specialized alloys. It functions as the primary separation surface where centrifugal forces cause denser particles or immiscible liquids to migrate outward while lighter phases move inward. This component features precisely engineered channels, distribution holes, and surface treatments to optimize flow patterns, prevent clogging, and withstand extreme rotational speeds (typically 5,000-15,000 RPM) and corrosive environments.

Working Principle

The top disc operates on centrifugal sedimentation principles. When the centrifuge rotates at high speed, the disc stack creates multiple parallel separation zones. The top disc receives the feed mixture through central distribution holes, then uses centrifugal force (typically 5,000-15,000×g) to separate components based on density differences. Heavier phases migrate to the disc periphery for collection, while lighter phases flow inward toward the centripetal pump. The disc's conical design (typically 35-45° angle) maximizes separation surface area while maintaining laminar flow conditions.

Materials

Stainless Steel 316L, Duplex Stainless Steel (UNS S31803), Titanium Grade 2, Hastelloy C-276, or specialized coatings (PTFE, ceramic) for corrosive applications. Material selection depends on process media pH, chloride content, temperature (typically -20°C to +150°C), and required yield strength (minimum 205 MPa).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	200-800 mm
Hardness	HRB 80-95
Thickness	1.5-4.0 mm
Conical Angle	35-45 degrees
Surface Finish	Ra ≤ 0.8 μm
Pressure Rating	Up to 10 bar
Distribution Holes	8-24 holes (Ø3-8 mm)
Operating Temperature	-20°C to +150°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 9001, ISO 14001, DIN 11850, ASME BPE

Parent Products

This component is used in the following industrial products

Disc Stack

A stack of conical discs within a separation bowl that provides the surface area for centrifugal separation of immiscible liquids or solids from liquids.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Corrosion in chloride environments
Imbalance causing vibration
Erosion from abrasive particles
Thermal stress cracking

FMEA Triads

Trigger: Material fatigue from high-cycle rotational stress
Failure: Crack propagation leading to disc fracture
Mitigation: Implement regular non-destructive testing (ultrasonic or dye penetrant), use fatigue-resistant alloys, maintain proper balancing

Trigger: Corrosive media attack
Failure: Pitting corrosion reducing structural integrity
Mitigation: Select appropriate corrosion-resistant materials, implement protective coatings, maintain proper pH control in process fluids

Trigger: Abrasive particle erosion
Failure: Thickness reduction and altered flow characteristics
Mitigation: Install pre-filtration systems, use hardened surface treatments, implement wear monitoring programs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter ±0.2 mm, Thickness ±0.1 mm, Hole position ±0.05 mm, Surface roughness Ra ≤ 0.8 μm

Test Method

Dimensional verification with CMM, material certification per ASTM A240, pressure testing at 1.5× operating pressure, dynamic balancing to ISO 1940 G2.5

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 Top Disc

Manufacturer profiles associated with Top Disc.

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Frequently Asked Questions

What is the primary function of the top disc in a disc stack centrifuge?

The top disc creates the initial separation zone where feed material is distributed and subjected to centrifugal force, initiating the separation of different density phases before they enter the main disc stack.

How often should top discs be inspected or replaced?

Regular visual inspections every 500 operating hours, with dimensional checks every 2,000 hours. Replacement typically occurs after 8,000-12,000 hours or when wear exceeds 0.5 mm thickness reduction.

Can top discs be customized for specific applications?

Yes, customization options include material grade, distribution hole patterns, surface coatings, and specific angles to optimize separation efficiency for particular process media.

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.

Top Disc