SIST EN 3789:2002

Aerospace series - Pipe coupling 8°30' - Protective plugs with external threads

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

Luft- und Raumfahrt - Rohrverschraubung 8°30' - Schutzstopfen mit Außengewinde

Série aérospatiale - Systeme de raccordement 8°30' - Bouchons de protection a filetage exterieur

Aerospace series - Pipe coupling 8-30' - Protective plugs with external 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 3789:2001 - Aerospace series - Pipe coupling 8°30' - Protective plugs with external threads

Relations

• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026
• Refers: oSIST prEN 415-2:2022 - Safety of packaging machines - Part 2: Packaging machines for pre-formed rigid containers
• Effective Date: 28-Jan-2026
• Refers: SIST EN 12631:1999 - Fruit and vegetable juices - Enzymatic determination of D- and L-lactic acid (lactate) content - NAD spectrometric method
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 60965:2016 - Nuclear power plants - Control rooms - Supplementary control room for reactor shutdown without access to the main control room (IEC 60965:2016)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN ISO 15874-2:2013 - Plastics piping systems for hot and cold water installations - Polypropylene (PP) - Part 2: Pipes (ISO 15874-2:2013)
• Effective Date: 28-Jan-2026
• Referred By: SIST EN ISO 15874-2:2004 - Plastics piping systems for hot and cold water installations - Polypropylene (PP) - Part 2: Pipes (ISO 15874-2:2003)
• Effective Date: 28-Jan-2026
• Corrected By: SIST EN 3789:2002/AC:2004 - Aerospace series - Pipe coupling 8°30' - Protective plugs with external threads
• Effective Date: 01-May-2004

Overview

SIST EN 3789:2002 is a European Standard developed by the European Committee for Standardization (CEN) focusing on the aerospace sector. The standard specifies the characteristics of plastic protective plugs with external threads, designed for 8°30' pipe couplings. These plugs are essential for safeguarding the threaded portions of pipe couplings during transportation, storage, and removal of aerospace units.

Protective plugs compliant with SIST EN 3789:2002 help maintain the integrity and performance of aerospace fluid systems by preventing contamination and damage. The use of these standardized components ensures compatibility and safety across a range of aerospace applications.

Key Topics

• Scope and Application
  SIST EN 3789:2002 applies to plastic plugs specifically intended for 8°30' pipe couplings in aerospace environments.
• Design and Material
  • The plugs are produced from high-density polyethylene (HDPE) and are typically white in color.
  • They feature a threaded external surface making them easy to screw onto the coupling ends, ensuring a secure fit that protects the internal threads and sealing surfaces.
• Performance Requirements
  • Plugs must be free from visible contamination and manufacturing defects such as burrs.
  • Designed to contain oil-filled hydraulic components at an overpressure of 0.1 MPa for at least eight hours without leakage.
• Dimensional Standards
  • Detailed dimensional specifications ensure uniformity and interchangeability.
  • References to ISO 5855-3 for MJ thread dimensions and ISO 2768-1 for general tolerances to ensure compatibility with aerospace fluid systems.
• Product Marking
  • Marking must conform to EN 2424 standards, using style F, including the code according to the table and figure outlined in the standard for easy identification.

Applications

SIST EN 3789:2002 is crucial in various aerospace applications where protection of pipe couplings is necessary during non-operational phases:

• Transport and Handling
  Protecting critical pipe coupling threads and seals from dust, moisture, and mechanical damage during transit.
• Storage
  Preventing contamination and corrosion during warehousing and long-term storage.
• Maintenance and Removal Operations
  Ensuring components remain free from particulates and other contaminants when systems are disassembled for inspection, repair, or replacement.

These protective plugs are designed to maintain the cleanliness and operational readiness of aerospace hydraulic systems, contributing to the reliability and safety of the entire aircraft.

Related Standards

For comprehensive aerospace fluid system protection and component compatibility, consider the following related standards:

• ISO 2768-1: General tolerances for linear and angular dimensions without individual tolerance indications.
• ISO 5855-3: Aerospace series - MJ threads - Limit dimensions for fittings for fluid systems, which specifies thread details compatible with SIST EN 3789:2002 plugs.
• EN 2424: Marking of aerospace products, providing the guidelines for marking the protective plugs for identification and traceability.

Practical Value

By adhering to SIST EN 3789:2002, aerospace manufacturers and maintenance teams can ensure high-quality protection of pipe couplings, reduce maintenance costs, and prevent system failures due to contamination or mechanical damage. Standardized protective plugs support interoperability across different manufacturers and countries, facilitating smoother supply chain processes and enhancing overall aircraft safety and durability.

Organizations involved in the aerospace industry should incorporate SIST EN 3789:2002 in their quality and procurement practices to comply with industry best practices and international regulations.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 8-30' - Protective plugs with external threadsLuft- und Raumfahrt - Rohrverschraubung 8°30' - Schutzstopfen mit AußengewindeSérie aérospatiale - Systeme de raccordement 8°30' - Bouchons de protection a filetage exterieurAerospace series - Pipe coupling 8°30' - Protective plugs with external threads49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 3789:2001SIST EN 3789:2002en01-januar-2002SIST EN 3789:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3789September 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' - Protective plugs withexternal 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 3789:2001 ESIST EN 3789:2002
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