Editorial Technical Reference

Flange Assembly

This page explains how Flange Assembly is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A structural component that provides mechanical connection and sealing interface in high-voltage insulating bushings.

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Flange Assembly in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Flange Assembly

Definition
The flange assembly is a critical part of a high-voltage insulating bushing that serves as the mounting and sealing interface between the bushing and the transformer or switchgear tank. It ensures proper mechanical support, electrical insulation continuity, and environmental sealing to prevent oil or gas leakage while maintaining dielectric integrity under high-voltage conditions. The assembly typically includes a flange body, bolting, and sealing elements such as gaskets or O-rings. It is designed to match the bushing flange size and is available in nominal diameters from 50 to 300 mm, with operating pressures from 1.0 to 1.6 MPa. The rated voltage range for high-voltage bushings is 12 to 36 kV, and the assembly is intended for operating temperatures from -40°C to 85°C. The flange assembly is manufactured from materials such as aluminum alloy (e.g., 6061-T6), stainless steel, or galvanized steel, depending on the application requirements. The tolerance grade for machining is IT6 to IT8, and the surface roughness is Ra 0.8 to 1.6 μm, which is critical for gasket sealing. The ingress protection rating is IP54 to IP65, with higher ratings for outdoor use. The weight of the assembly ranges from 5 to 25 kg, depending on size and material. These values are reference ranges and must be confirmed for the specific model and application. The flange assembly is a component used in electrical equipment manufacturing, and its design and verification should follow relevant standards such as IEC 60137, ISO 286, ISO 1302, IEC 60068-2-14, and IEC 60529. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The flange assembly creates a secure mechanical connection between the bushing and equipment housing through bolted joints, while incorporating gaskets or sealing systems to prevent fluid leakage. It maintains electrical insulation by properly spacing conductive elements and may include grading rings or shielding to manage electric field distribution. The assembly ensures that the bushing is properly aligned and supported, and that the sealing surfaces are flat and smooth to achieve the required ingress protection. The operating pressure range is 1.0 to 1.6 MPa, and above 1.6 MPa, it may cause damage. The tolerance grade and surface roughness are critical for achieving a reliable seal. The assembly must be installed with the correct torque on the bolts and proper gasket placement to maintain dielectric integrity and prevent leakage.
Common Materials
Aluminum alloy, Stainless steel, Galvanized steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal Diameter50–300 mmMatches bushing flange size
Rated Voltage12–36 kVFor high-voltage bushingsIEC 60137
Tolerance GradeIT6–IT8Ensures sealing surface flatnessISO 286
Surface RoughnessRa 0.8–1.6 μmCritical for gasket sealingISO 1302
Operating Temperature-40–85 °COutside range may cause material degradationIEC 60068-2-14
Ingress ProtectionIP54–IP65Higher IP for outdoor useIEC 60529
Material Grade6061-T6Aluminum alloy for lightweight and corrosion resistanceASTM B211
Weight5–25 kgDepends on size and material

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

Components / BOM
  • Flange Plate Part
    Primary structural element providing mounting surface and mechanical strength
    Material: Aluminum alloy or steel
  • Sealing Gasket Part
    Creates fluid-tight seal between flange and mating surface
    Material: Nitrile rubber or silicone
  • Mounting Bolts Part
    Secure the flange assembly to the equipment housing
    Material: Stainless steel
  • Insulating Sleeve Part
    Provides electrical insulation around mounting bolts
    Material: Porcelain or composite polymer
  • Grading Ring Optional
    Evens out the electric field at the flange so it does not concentrate and discharge.

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (145 psi)
other spec: Voltage rating: 72.5 kV to 800 kV, Sealing force: 20-100 kN
temperature: -40°C to +150°C
Media Compatibility
✓ SF6 gas insulation systems ✓ Mineral oil transformer fluids ✓ Dry air/nitrogen environments
Unsuitable: Corrosive chemical environments with acids or strong bases
Sizing Data Required
  • Bushing nominal voltage (kV)
  • Flange mounting interface dimensions (mm/in)
  • Required sealing pressure and gasket type

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Flange face corrosion
Cause: Chemical attack from process fluids or atmospheric exposure leading to material degradation and sealing surface loss
Gasket failure
Cause: Improper gasket selection, over-torquing during assembly, or thermal cycling causing compression set or blowout
Maintenance Indicators
  • Visible fluid leakage at flange joint interface
  • Audible hissing or whistling sound indicating pressure escape
Engineering Tips
  • Implement proper bolt torque sequence and tension monitoring during assembly to ensure uniform gasket compression
  • Use corrosion-resistant flange materials or protective coatings matched to service environment, and conduct regular NDT thickness testing

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 7005-1:2011 (Pipe flanges) ANSI/ASME B16.5:2020 (Pipe Flanges and Flanged Fittings) DIN EN 1092-1:2018 (Flanges and their joints)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/- 0.05 mm
  • Flatness: 0.1 mm per 300 mm diameter
Quality Inspection
  • Dye Penetrant Test (DPT) for surface defects
  • Dimensional verification with coordinate measuring machine (CMM)
Technical documentation
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Manufacturing capability
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Inspection readiness
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Manufacturers of Flange Assembly

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Shandong Friend Control System Co., Ltd.
Shandong, CN
Also makes: Signal Processor, Pressure Gauge/Sensor, Level Transmitter and 4 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “flange assembly”
View source page ↗ frdsensor.com · recorded 2026-09-18
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Frequently Asked Questions

What is the purpose of a flange assembly in a high-voltage bushing?

The flange assembly provides a mechanical connection and sealing interface between the bushing and the transformer or switchgear tank. It ensures proper support, electrical insulation continuity, and prevents oil or gas leakage.

What are the typical materials used for flange assemblies?

Common materials include aluminum alloy (e.g., 6061-T6), stainless steel, and galvanized steel. The choice depends on factors like corrosion resistance, weight, and mechanical strength requirements.

What standards apply to flange assemblies for high-voltage bushings?

Relevant standards include IEC 60137 for bushings, ISO 286 for tolerances, ISO 1302 for surface roughness, IEC 60068-2-14 for temperature, and IEC 60529 for ingress protection. Always verify compliance with the manufacturer.

How should I verify the correct flange assembly for my application?

Check the nominal diameter, operating pressure, rated voltage, operating temperature, and ingress protection rating against your requirements. Confirm material grade and surface finish. Always consult the legal manufacturer or supplier for model-specific data.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Viewport Assembly
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Thermowell Assemblies
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High-Voltage Bushings
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Sterile Product Tank Interface
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Gas Offtake
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Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

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 · Page last updated 10 October 2026

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