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Cover/Flange Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

A mechanical component designed to seal manholes and cleaning ports on tanks, vessels, and processing equipment. It consists of a cover plate, gasket, and fastening mechanism (bolts, clamps, or hinges) that creates a pressure-tight or contamination-proof seal while allowing periodic access for inspection, maintenance, or cleaning.

Working Principle

The cover/flange creates a sealed interface through compressive force applied by fasteners, which compresses a gasket between mating surfaces. This prevents leakage of contents (liquids, gases, or powders) and ingress of contaminants. Hinged or quick-opening designs facilitate safe, efficient access without complete disassembly.

Materials

Common materials include carbon steel (ASTM A36), stainless steel (304/316L), aluminum alloys, or engineered plastics (PTFE, polypropylene). Gaskets: elastomeric (EPDM, nitrile), graphite, or PTFE-based. Coatings: epoxy, galvanized, or powder-coated for corrosion resistance.

Technical Parameters

Diameter 150mm to 600mm (standard)
Fastening Bolted, clamped, or hinged
Seal Type Flat face, raised face, or ring-type joint
Surface Finish Ra ≤ 3.2 μm for gasket seating
Pressure Rating Up to 10 bar (150 psi)
Temperature Range -40°C to 200°C

Standards

ISO 14122, ASME B16.5, DIN 2501

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cover/Flange.

Parent Products

This component is used in the following industrial products

Manhole/Cleaning Port

An access opening on a liquid storage tank for inspection, maintenance, and cleaning purposes.

View Product Details

Tap Changer Tank

The sealed enclosure containing the insulating oil and housing the tap changer mechanism.

View Product Details

Engineering Analysis

Risks & Mitigation

Gasket failure leading to leaks
Improper installation causing pressure release
Corrosion compromising structural integrity
Entrapment hazards during maintenance

FMEA Triads

Trigger: Gasket degradation due to chemical exposure or temperature
Failure: Leakage of contents or contamination ingress
Mitigation: Use compatible gasket materials; implement regular inspection and replacement schedules

Trigger: Over-torquing or under-torquing of bolts
Failure: Uneven sealing leading to leaks or bolt failure
Mitigation: Use calibrated torque wrenches; follow manufacturer's torque specifications and patterns

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Flange flatness within 0.1 mm per 100 mm diameter; bolt hole alignment within ±0.5 mm

Test Method

Pressure testing per ASME BPVC Section VIII; leak testing with soap solution or helium mass spectrometry

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 cover and a flange in this context?

A cover typically refers to the removable plate, while a flange is the fixed mounting ring on the equipment. Together, they form a sealed assembly.

How often should manhole covers be inspected?

Inspect during each opening, and perform formal checks annually for wear, corrosion, gasket integrity, and fastener torque.

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.

Cover/Flange