ISO 16486-2:2020

Overview

ISO 16486-2:2020 specifies requirements for pipes made from unplasticized polyamide (PA‑U) intended to be buried and used for the supply of gaseous fuels. It defines physical and mechanical properties, test parameters for referenced methods, dimensional characteristics and marking rules for PA‑U piping systems that are jointed by fusion (butt or electrofusion) and/or mechanical jointing. The document is part of the ISO 16486 series covering PA‑U systems for gas distribution.

Key topics and technical requirements

• Material and compound
  • Pipes shall be made from virgin PA‑U (no rework/recycled material); compound requirements reference ISO 16486‑1.
• Appearance and colour
  • Internal/external surfaces must be smooth and defect‑free; colour options are yellow or black (black may have yellow/orange stripes).
• Fusion compatibility
  • PA‑U11 must only be fusion‑joined to PA‑U11; PA‑U12 only to PA‑U12. PA‑U is not fusion compatible with other polymers.
• Geometrical characteristics
  • Mean outside diameter, out‑of‑roundness, wall thicknesses and tolerances are specified (measurement at 23 ± 2 °C after conditioning for ≥4 h and ≥24 h after manufacture).
• Mechanical and physical characteristics
  • Conditioning procedures and test parameter limits are defined for mechanical and physical tests; referenced test methods include standards such as ISO 1167, ISO 3126, ISO 6259 series, among others.
• Marking
  • Requirements for pipe identification and marking are included to support traceability and safe installation.
• Annexes
  • Normative Annex A - Squeeze‑off technique (for temporary flow restriction).
  • Informative Annex B - Water uptake examples as a function of sample thickness.

Applications and who uses this standard

ISO 16486‑2 is intended for:

• Manufacturers of PA‑U pipes (product design, quality control, production tolerances)
• Gas utilities and network operators specifying buried gas distribution piping
• Engineers and designers creating gas infrastructure and specifying materials and jointing methods
• Testing and certification bodies validating compliance with mechanical/physical tests
• Installers and contractors selecting compatible jointing techniques (mechanical, electrofusion, butt fusion)

Benefits include improved safety, interoperability, quality assurance and regulatory compliance for buried gas supply systems using PA‑U piping.

Related standards

• ISO 16486‑1, ‑3, ‑4, ‑5, ‑6 (other parts of the PA‑U piping systems series)
• ISO/TS 16486‑7 (conformity/assessment in preparation)
• Referenced test standards: ISO 1167, ISO 3126, ISO 6259, ISO 11922‑1, ISO 13477, ISO 13479, etc.

Keywords: ISO 16486-2:2020, PA-U, unplasticized polyamide, plastics piping systems, gaseous fuels, fusion jointing, mechanical jointing, gas distribution pipes, pipe dimensions, pipe marking.