EN 4802:2017

Overview

EN 4802:2017 is a European Standard that defines the characteristics and specifications for swivel flanges with three fastening holes, made from nickel alloy, used in aerospace flange couplings. This standard covers inch series flange couplings designed for critical aerospace fluid systems, ensuring reliable and safe connections under demanding operational conditions. The standard establishes requirements for material, dimensions, tolerances, surface treatments, and quality assurance processes essential for aerospace industry applications.

Nominal pressure ratings for these swivel flanges can reach up to 21,000 kPa, depending on factors such as seal type, tube material, diameter, and wall thickness, as specified in EN 4814. It is vital that assembly complies with TR 4815 to guarantee proper functionality and safety.

Key Topics

• Material Composition: The swiveled flanges are made from specialized nickel alloys as detailed in aerospace-specific standards (EN 3671, EN 4376, EN 4377, EN 4379, EN 4380). The material is selected for high strength, corrosion resistance, and heat resistance to comply with aerospace environmental demands.

• Design and Dimensions: The standard specifies flange configurations with three equally spaced fastening holes. Detailed dimensional data in millimeters and allowable tolerances are provided to ensure interchangeability and compliance with aerospace manufacturing standards.

• Surface Treatment: Flanges must undergo passivation and decontamination processes according to EN 2516, enhancing corrosion resistance and longevity in aerospace environments.

• Marking and Identification: Markings must comply with EN 2424 Category A to ensure traceability and quality control of aerospace components.

• Quality Assurance: Manufacturer approval is mandatory under EN 9100, which governs quality management systems for aviation, space, and defense organizations.

Applications

EN 4802:2017 swivel flanges are primarily used in aerospace fluid systems where precise, durable, and lightweight flange couplings are crucial. Key applications include:

• Hydraulic and fuel lines in aircraft and spacecraft requiring high pressure and temperature resistance
• Fluid transfer systems in aerospace manufacturing and assembly where reliability and compliance with stringent aerospace standards are mandatory
• Replacement or maintenance parts in aerospace vehicles needing certified couplings that match existing inch series flange configurations

Their ability to withstand nominal pressures up to 21,000 kPa, combined with corrosion-resistant nickel alloy composition, makes these swivel flanges ideal for harsh aerospace environments demanding robust and secure fluid connections.

Related Standards

To fully implement and comply with EN 4802:2017, familiarity with the following related standards is important:

• EN 4814: Technical specifications for flange couplings rated up to 21,000 kPa, providing complementary requirements for assembly and performance.
• TR 4815: Assembly guidelines for aerospace flange couplings, ensuring correct installation practices.
• EN 2516: Passivation and decontamination procedures for corrosion-resistant steels and nickel alloys.
• EN 2424: Marking requirements for aerospace products, critical for traceability.
• EN 9100: Quality management standards specific to aviation, space, and defense sectors.
• Aerospace nickel alloy specifications such as EN 3671, EN 4376, EN 4377, EN 4379, and EN 4380, detailing material standards for different nickel-based alloys used in flange manufacturing.

By adhering to EN 4802:2017 alongside these complementary standards, aerospace manufacturers and suppliers can ensure flange couplings meet the highest quality, safety, and performance requirements demanded by the aerospace industry.

Keywords: EN 4802:2017, aerospace flange couplings, swivel flange, nickel alloy, inch series, aerospace fluid systems, flange with 3 fastening holes, aerospace nickel alloy flanges, aerospace standards, flange pressure rating, EN 4814, EN 2516, EN 9100 compliance.