ISO 21307:2017/Amd 1:2020

Overview

ISO 21307:2017/Amd 1:2020 is an important amendment to the international standard that specifies butt fusion jointing procedures for polyethylene (PE) piping systems. This update, issued by the International Organization for Standardization (ISO), refines key parameters related to the fusion process of plastic pipes and fittings, particularly focusing on enhancing the accuracy and reliability of butt fusion joints in PE piping systems. The amendment includes updated tables on fusion parameters designed to improve the performance and safety of polyethylene pipe installations used for fluid transport.

This amendment targets stakeholders involved in the manufacture, installation, and maintenance of PE piping systems, ensuring standardized procedures for butt fusion jointing that meet international quality and safety requirements.

Key Topics

• Butt Fusion Jointing Procedures
  The amendment provides revised parameters for both low-pressure and high-pressure fusion processes, detailing the time, temperature, pressure, and cooling requirements critical to achieving strong, reliable welds in polyethylene pipes.

• Updated Fusion Parameters
  Two key tables are replaced with updated parameters:

  • Dual Low-Pressure Fusion Jointing: Includes specifics such as nominal outside diameter, wall thickness, bead-up size, heat soak time, cycle cooling time, and minimum cooling times under pressure and after machine removal.
  • Single High-Pressure Fusion Jointing: Defines heater plate times, bead size after heating, heating removal durations, and cooling periods critical to the high-pressure fusion process.

• Temperature and Time Recommendations
  The amendment underscores the importance of adjusting heater temperatures and fusion times based on ambient conditions, especially recommending higher temperatures and heat soak times in lower ambient temperatures to ensure adequate fusion quality.

• Safety and Quality Compliance
  Following these updated parameters ensures joints comply with internationally recognized standards, minimizing joint failures and ensuring longevity and operational safety in PE pipeline systems.

Applications

• Water Supply Systems
  Ensures the integrity of PE pipes used in potable water distribution by standardizing butt fusion joints for leak-free performance.

• Gas Distribution Networks
  Enhances safety and reliability in gas transportation pipelines, where secure fusion joints are critical to preventing leaks and maintaining system pressure.

• Industrial Fluid Transport
  Supports industries that utilize PE piping for chemicals and fluids, ensuring that jointing procedures maintain structural and chemical resistance properties.

• Infrastructure and Construction
  Facilitates standard-compliant installation practices for infrastructure projects involving PE piping, reducing maintenance and repair costs caused by joint failures.

Related Standards

• ISO 12176-1
  This standard complements ISO 21307 by specifying fusion machine performance and heating plate requirements used in butt fusion welding of PE pipes.

• ISO/TC 138 Series
  Covers related standards for plastics pipes, fittings, and valves used in fluid transport, providing a comprehensive regulatory framework for pipe jointing procedures.

• ISO/IEC Directives, Part 1 and Part 2
  Guide the development, editorial rules, and maintenance of ISO standards such as ISO 21307.

By adhering to ISO 21307:2017/Amd 1:2020, manufacturers, engineers, and inspectors can enhance the durability and safety of polyethylene piping systems through standardized butt fusion welding techniques, aligning with global best practices and improving overall pipeline performance.