Cover/Flange: Temperature Range -40°C to 200°C

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

Parameter	Typical range	Notes & selection driver
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

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 14122, ASME B16.5, DIN 2501

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

Sealed enclosure containing 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

Typical Suppliers & Equivalents

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

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 Cover/Flange

Manufacturer profiles associated with Cover/Flange.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

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.

Cover/Flange