Flange Ring: Diameter Typically 300-600 mm, Thickness 10-25 mm

Component Specifications

Definition

A flange ring is a critical component in pressure vessel manway assemblies, designed to create a robust, leak-proof interface between the removable manway cover and the vessel shell. It typically features bolt holes for fastening and a sealing surface to accommodate gaskets, ensuring pressure integrity and safety in high-pressure environments.

Working Principle

The flange ring works by distributing clamping force evenly via bolts to compress a gasket against its sealing surface, forming a tight seal that prevents fluid or gas leakage under pressure. It aligns and secures the manway cover to the vessel, allowing for safe access while maintaining structural integrity.

Materials

Common materials include carbon steel (e.g., ASTM A105), stainless steel (e.g., ASTM A182 F304/F316), or alloy steel, selected based on pressure, temperature, and corrosion resistance requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	Typically 300-600 mm
Thickness	10-25 mm
Surface Finish	Ra 3.2 μm or smoother for sealing
Pressure Rating	150-300 psi
Bolt Circle Diameter	As per ASME standards

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ASME BPVC Section VIII, ISO 7005-1, DIN 2501

Parent Products

This component is used in the following industrial products

Pressure Vessel Manway Assembly

A standardized manway assembly providing safe, pressure-tight access to the interior of metal tanks, reservoirs, and pressure vessels.

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Engineering Analysis

Risks & Mitigation

Leakage due to improper gasket compression
Bolt failure from over-torquing
Corrosion in aggressive environments
Misalignment causing seal failure

FMEA Triads

Trigger: Insufficient bolt torque
Failure: Gasket leakage under pressure
Mitigation: Follow torque specifications and use calibrated tools

Trigger: Material corrosion
Failure: Structural weakening and leaks
Mitigation: Select corrosion-resistant materials and implement regular inspections

Industrial Ecosystem

Compatible With

Pressure vessels, reactors, storage tanks

Typical Suppliers & Equivalents

Parker Hannifin, Swagelok, ASME-compliant manufacturers

Compliance & Inspection

Tolerance

Dimensional tolerances per ASME B16.5, typically ±0.8 mm for bolt holes

Test Method

Hydrostatic pressure testing per ASME BPVC Section VIII, visual inspection, and dimensional checks

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

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Manufacturers of Flange Ring

Manufacturer profiles associated with Flange Ring.

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Frequently Asked Questions

What is the primary function of a flange ring in a pressure vessel?

It provides a sealed, bolted connection between the manway cover and vessel, ensuring no leakage under operational pressure.

How do you select the right material for a flange ring?

Based on factors like pressure, temperature, fluid compatibility, and corrosion resistance, with common choices being carbon or stainless steel per ASTM standards.

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.

Flange Ring