SIST EN 3790:2002

Aerospace series - Pipe coupling 8°30' - Protective caps with internal threads

This standard specifies the characteristics for plastic caps for pipe couplings 8°30' used to protect the couplings during transportation, storage and removal of units in system, for aerospace applications. The caps incorporate an internal thread for screwing on to the threaded portion of a pipe coupling.

Luft- und Raumfahrt - Rohrverschraubung 8°30' - Schutzkappen mit Innengewinde

Série aérospatiale - Systeme de raccordement 8°30' - Capuchons de protection a filetage intérieur

Aerospace series - Pipe coupling 8-30' - Protective caps with internal threads

General Information

• Status: Published
• Publication Date: 31-Dec-2001
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2002
• Due Date: 01-Jan-2002
• Completion Date: 01-Jan-2002
• Ref Project: EN 3790:2001 - Aerospace series - Pipe coupling 8°30' - Protective caps with internal threads

Relations

• Corrected By: SIST EN 3790:2002/AC:2004 - Aerospace series - Pipe coupling 8°30' - Protective caps with internal threads
• Effective Date: 01-May-2004

Overview

SIST EN 3790:2002 is a European standard developed by CEN, specifying the characteristics of protective plastic caps with internal threads designed for aerospace pipe couplings with an 8°30' angle. These caps are used to safeguard the couplings during transportation, storage, and removal of units in aerospace fluid systems. Their internal threaded design allows secure fitting onto the threaded portion of the pipe coupling, preventing contamination and damage.

This standard aligns with aerospace industry requirements for reliability and quality in fluid system components, promoting consistent protection methods for sensitive pipe connections in aerospace applications.

Key Topics

• Scope and Application
  SIST EN 3790:2002 covers plastic protective caps specifically for pipe couplings with an 8°30' flare angle in aerospace fluid systems. The caps are intended for temporary protection during handling, transportation, and storage phases, ensuring component integrity until installation.

• Material Specifications
  The caps are made of white polyethylene, offering durability and resistance to contamination without compromising sealing performance under normal aerospace system handling conditions.

• Design and Dimensions
  Caps feature internal threads conforming to MJ thread limits as defined in ISO 5855-3 to match the coupling threads precisely. Dimensions follow strict tolerances specified in the standard and ISO 2768-1 for linear and angular measurements, with manufacturer options for unspecified dimensions.

• Performance Requirements
  The caps must be free of visible contamination and burrs, ensuring clean internal surfaces and threads. They are capable of withstanding a 0.1 MPa overpressure for 8 hours without leakage, demonstrating effective sealing under typical aerospace storage and transport conditions.

• Marking and Identification
  Markings comply with EN 2424, style F, including the standard number, product code (based on coupling size), and optionally, the code I9005. Proper marking ensures traceability and easy identification during logistics and integration processes.

Applications

SIST EN 3790:2002 protective caps are essential in the aerospace industry for:

• Transportation Protection
  Safeguarding pipe couplings from dirt, moisture, mechanical damage, and contamination during shipment between manufacturing sites and assembly plants.

• Storage Safeguards
  Maintaining component cleanliness and thread integrity during extended storage periods in warehouses or on-site before installation.

• Maintenance and Assembly
  Protecting pipe couplings when units are removed for repair or service, preventing damage while disconnected.

• Quality Assurance in Aerospace Fluid Systems
  Ensuring that critical hydraulic and fluid system pipe couplings remain uncontaminated and damage-free, which is vital for operational safety and system functionality.

Related Standards

• ISO 2768-1 - General tolerances for linear and angular dimensions without individual tolerance indications, referenced for dimensional accuracy.
• ISO 5855-3 - Aerospace series MJ threads, defining limit dimensions for fluid system fittings compatible with these protective caps.
• EN 2424 - Aerospace series marking codes, specifying marking styles for aerospace products to promote consistent identification.
• AECMA Guidelines - The standard reflects aerospace manufacturers' consensus, governed by the European Association of Aerospace Manufacturers (AECMA), ensuring industry-wide acceptance.

Conclusion

SIST EN 3790:2002 provides clear, detailed specifications for protective caps with internal threads used on aerospace pipe couplings with an 8°30' flare angle. This standard is critical for maintaining the integrity, cleanliness, and functionality of pipe couplings in aerospace fluid systems throughout manufacturing, storage, transportation, and maintenance stages. Applying this standard supports aerospace industry best practices for component protection, safety, and reliability.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 8-30' - Protective caps with internal threadsLuft- und Raumfahrt - Rohrverschraubung 8°30' - Schutzkappen mit InnengewindeSérie aérospatiale - Systeme de raccordement 8°30' - Capuchons de protection a filetage intérieurAerospace series - Pipe coupling 8°30' - Protective caps with internal threads49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 3790:2001SIST EN 3790:2002en01-januar-2002SIST EN 3790:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3790September 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' - Protective caps withinternal threadsThis European Standard was approved by CEN on 29 December 2000.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3790:2001 ESIST EN 3790:2002
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