SIST EN ISO 16486-4:2025/A11:2025

Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Part 4: Valves

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen Verbindungen - Teil 4: Armaturen

Systèmes de canalisations en matières plastiques pour la distribution de combustibles gazeux - Systèmes de canalisations en polyamide non plastifié (PA-U) avec assemblages par soudage et assemblages mécaniques - Partie 4: Robinets

Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Cevni sistemi iz nemehčanega poliamida (PA-U) z zvari in mehanskimi spoji - 4. del: Ventili - Dopolnilo A11

General Information

• Status: Published
• Publication Date: 23-Oct-2025
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Oct-2025
• Due Date: 25-Dec-2025
• Completion Date: 24-Oct-2025
• Ref Project: EN ISO 16486-4:2025/A11:2025 - Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Part 4: Valves

Relations

• Amends: SIST EN ISO 16486-4:2025 - Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Part 4: Valves (ISO 16486-4:2025)
• Effective Date: 10-Sep-2025

Overview

SIST EN ISO 16486-4:2025/A11:2025 is the latest amendment to the European standard focused on plastics piping systems for the supply of gaseous fuels, specifically addressing unplasticized polyamide (PA-U) piping systems with both fusion jointing and mechanical jointing methods. Part 4 of this standard targets the design, performance, and testing requirements of valves used within these piping systems.

Developed by the Technical Committee CEN/TC 155 under the European Committee for Standardization (CEN), this amendment refines existing regulations to ensure safety, reliability, and interoperability in gaseous fuel distribution infrastructures. The standard harmonizes diverse national requirements and emphasizes high-quality components in modern gas supply chains.

Key Topics

• Unplasticized Polyamide (PA-U) Piping
  Focuses on the use of PA-U materials known for their mechanical strength, chemical resistance, and suitability for delivering gaseous fuels safely.

• Fusion and Mechanical Jointing
  Specifies criteria for connecting piping systems using both heat fusion welding and mechanical fittings, ensuring secure and leak-proof joints.

• Valve Specifications
  Detailed requirements for valves include material properties, pressure ratings, operational reliability, and compatibility with the PA-U piping systems.

• Safety and Compliance
  Addresses safety factors critical for gaseous fuel systems, including resistance to pressure, temperature ranges, and mechanical stress.

• National Deviations (A-Deviations)
  Notes specific national legislative exceptions, such as Italy's regulations mandating steel pipes for certain transmission systems, indicating where compliance with the EN ISO standard may be modulated.

Applications

This standard is essential for manufacturers, designers, and installers involved in:

• Gas Distribution Networks
  Ensuring valves and piping systems meet stringent safety and functional standards in urban and industrial gas supply.

• Industrial Gas Handling
  Use within facilities requiring durable piping solutions for gaseous fuel transport where PA-U's properties offer advantages over traditional materials.

• Building Services Engineering
  Installation in residential and commercial buildings for safe and efficient gas delivery, utilizing fusion or mechanical joints for flexible system layouts.

• Maintenance and Inspection
  Providing benchmarks for inspection criteria, replacement, and maintenance of valves and joints within PA-U piping systems.

Related Standards

• EN ISO 16486 Series
  Covers multiple parts addressing design, materials, jointing, and testing methods for PA-U piping systems supplying gaseous fuels. Part 4 specifically focuses on valves.

• National Standards References
  Includes national standards like Italy’s UNI 9034 concerning pressure limits and piping materials for different gas system categories.

• General Plastics Piping Standards (ICS 83.140.30)
  Relating to polymer pipes and fittings for non-liquid substances, providing overarching guidance relevant to gaseous fuel applications.

• Petroleum and Natural Gas Equipment Standards (ICS 75.200)
  Broad standards covering equipment used for natural gas handling, storage, and distribution, complementing the EN ISO 16486 series.

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By integrating the requirements of SIST EN ISO 16486-4:2025/A11:2025, stakeholders can ensure that PA-U piping systems and valves fulfill the latest safety, quality, and performance criteria vital for efficient gaseous fuel supply. Compliance with this standard supports sustainable energy infrastructure development and contributes to harmonized European gas distribution regulations.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2025
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Cevni sistemi
iz nemehčanega poliamida (PA-U) z zvari in mehanskimi spoji - 4. del: Ventili -
Dopolnilo A11
Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing - Part 4: Valves
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 4: Armaturen
Systèmes de canalisations en matières plastiques pour la distribution de combustibles
gazeux - Systèmes de canalisations en polyamide non plastifié (PA-U) avec
assemblages par soudage et assemblages mécaniques - Partie 4: Robinets
Ta slovenski standard je istoveten z: EN ISO 16486-4:2025/A11:2025
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16486-
EUROPEAN STANDARD
4:2025/A11
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 75.200; 83.140.30
English Version
Plastics piping systems for the supply of gaseous fuels -
Unplasticized polyamide (PA-U) piping systems with
fusion jointing and mechanical jointing - Part 4: Valves
Systèmes de canalisations en matières plastiques pour Kunststoff-Rohrleitungssysteme für die Gasversorgung
la distribution de combustibles gazeux - Systèmes de - Rohrleitungssysteme aus weichmacherfreiem
canalisations en polyamide non plastifié (PA-U) avec Polyamid (PA-U) mit Schweißverbindungen und
assemblages par soudage et assemblages mécaniques - mechanischen Verbindungen - Teil 4: Armaturen
Partie 4: Robinets
This amendment A11 modifies the European Standard EN ISO 16486-4:2025; it was approved by CEN on 20 August 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of ex
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