Duct Connection Flange: Diameter Range 100-2000 mm

Component Specifications

Definition

A duct connection flange is a flat, ring-shaped component with bolt holes, designed to connect two duct sections in ventilation or exhaust systems. It provides a rigid, sealed interface that prevents air leakage, maintains pressure integrity, and allows for easy assembly and disassembly. Typically installed at duct ends using welding, riveting, or mechanical fasteners, it ensures proper alignment and load distribution in systems like containment hoods.

Working Principle

The flange creates a mating surface between duct sections, secured with bolts through aligned holes. A gasket inserted between flanges compresses upon tightening, forming an airtight seal. This mechanical joint transfers loads, resists vibration, and maintains system pressure by preventing gaps or misalignment.

Materials

Common materials include galvanized steel (ASTM A653), stainless steel (AISI 304/316 for corrosion resistance), aluminum (6061-T6 for lightweight applications), or carbon steel (ASTM A36). Gaskets are often made from neoprene, silicone, or EPDM rubber.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bolt Size	M8 to M20
Diameter Range	100-2000 mm
Pressure Rating	Up to 5000 Pa
Flange Thickness	3-12 mm
Temperature Range	-40°C to 400°C
Bolt Circle Diameter	Varies by standard

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 5801, DIN 24194, SMACNA Duct Construction Standards, ASHRAE Handbook

Parent Products

This component is used in the following industrial products

Containment Hood

A protective enclosure that captures airborne dust at the source in industrial processes.

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Engineering Analysis

Risks & Mitigation

Leakage due to improper sealing
Corrosion in harsh environments
Structural failure from over-tightening or vibration
Misalignment causing airflow restriction

FMEA Triads

Trigger: Incorrect gasket material or installation
Failure: Air leakage reducing system efficiency
Mitigation: Use compatible gaskets and follow torque specifications during assembly.

Trigger: Corrosion from exposure to moisture or chemicals
Failure: Flange degradation and joint failure
Mitigation: Select corrosion-resistant materials like stainless steel and apply protective coatings.

Trigger: Vibration from machinery
Failure: Bolt loosening and joint separation
Mitigation: Use lock washers or thread-locking compounds, and implement regular maintenance checks.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1 mm for bolt hole alignment, ±2 mm for flange flatness per ISO 2768-m

Test Method

Pressure testing per ISO 5801, leak detection using smoke or ultrasonic methods, visual inspection for gaps and corrosion.

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 Duct Connection Flange

Manufacturer profiles associated with Duct Connection Flange.

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Frequently Asked Questions

What is the purpose of a duct connection flange in a containment hood?

It ensures a secure, leak-proof joint between duct sections, maintaining system efficiency, safety, and compliance with ventilation standards by preventing air or contaminant escape.

How do you select the right flange material?

Choose based on environmental factors: galvanized steel for general use, stainless steel for corrosive or high-temperature environments, and aluminum for lightweight needs, considering cost and durability.

What are common installation errors with duct flanges?

Errors include improper gasket placement, uneven bolt tightening leading to leaks, misalignment causing stress, and using incorrect bolt sizes or materials for the application.

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.

Duct Connection Flange