ISO 22749-2:2021

Overview

ISO 22749-2:2021 is an international standard published by the International Organization for Standardization (ISO) that focuses on railway applications specifically involving suspension components made of elastomer-mechanical parts. This standard provides a comprehensive approval procedure and quality monitoring framework for these critical rubber and rubber-to-metal components used within railway rolling stock suspension systems. It complements ISO 22749-1, which defines the characteristics and test methods for these parts.

The standard is designed primarily for railway operators, manufacturers, and equipment suppliers involved in the design, production, and maintenance of elastomer-mechanical parts. It outlines mandatory procedures to ensure product reliability, traceability, and consistent quality across manufacturing processes, minimizing risks related to suspension component failures.

Key Topics

• Scope and Exclusions
  ISO 22749-2 applies expressly to elastomer-mechanical parts for railway suspension components, excluding items such as rubber diaphragms for pneumatic springs, elastic parts of buffing springs, seals, hoses, tubings, and transmission belts.

• Approval Procedure
  The customer is responsible for implementing a detailed approval process before components are fitted to vehicles. This includes defining technical specifications, testing requirements, and quality standards tailored to the specific suspension application.

• Qualification Guidelines
  All new components or existing components introduced for new applications must undergo qualification testing to verify conformance with customer specifications. The qualification process involves

  • Test piece sampling from consistent production batches
  • Verification of all critical product characteristics
  • Agreement on testing scope and procedures between customer and supplier

• Traceability and Supplier Qualification
  Suppliers must maintain traceability systems that comply with ISO 9000 principles and ensure that all manufacturing steps occur in qualified production plants with certified quality assurance systems.

• Quality Surveillance and Inspection
  Ongoing quality monitoring via agreed inspection methods and quality plans is essential. The supplier proposes quality control methods, and the customer may request specific checks aligned with ISO 22749-1 testing tables.

• Change Management
  Post-qualification, any changes to design, materials, manufacturing processes, or plant must be reported and approved to maintain valid product qualification. Manufacturing interruptions or incident investigations may also trigger requalification.

Applications

ISO 22749-2:2021 is crucial for industries involved in the lifecycle of railway suspension components that use elastomeric materials. Typical applications include:

• Design and manufacturing of elastomeric suspension parts such as rubber-metal bonded parts used in shock absorption and vibration dampening.
• Quality assurance processes for rubber-to-metal bonded components in railway bogies and suspension systems.
• Supplier management and product approval workflows ensuring compliance with customer and regulatory requirements.
• Enhancing durability and safety of railway rolling stock through stringent quality monitoring and traceability of suspension components.
• Supporting maintenance teams by providing clear documentation on fitting, storage, and inspection based on approved specifications.

Related Standards

• ISO 22749-1:2021 - Railway applications - Suspension components - Part 1: Characteristics and test methods for elastomer-mechanical parts; this standard defines the product characteristics and testing protocols that ISO 22749-2 refers to for quality verification.
• ISO 9000 - Quality management systems - Fundamentals and vocabulary; referenced for traceability and supplier quality system requirements.
• EN 13913 - Railway applications - Rubber suspension components - Elastomer-based mechanical parts; the approval procedure and quality monitoring sections of this European standard informed the development of ISO 22749-2.

By adhering to ISO 22749-2:2021, railway stakeholders can ensure that elastomer-mechanical suspension components meet stringent quality and reliability benchmarks, ultimately improving the safety and performance of railway vehicles worldwide.