Overview
ISO 17484-2:2009 - Plastics piping systems - Multilayer pipe systems for indoor gas installations - Part 2: Code of practice - is a recommended practice for the installation of multilayer plastic gas pipe systems in buildings. It applies to indoor gas supply systems with a maximum operating pressure (MOP) up to and including 5 bar (500 kPa). The document complements ISO 17484-1 (system specifications) and provides functional guidance on safe design, installation and commissioning of multilayer pipework for gas.
Key topics and technical requirements
- Scope and intent: Practical installation guidance for multilayer pipe systems (used for gaseous fuels) inside buildings; national regulations take precedence.
- Design principles: Reference to installation standards; consideration of gas type, design pressure, location and operating temperature.
- Location and routing: Minimise length and joints, avoid diagonal runs, place pipework in ventilated spaces, and reduce risk of third‑party damage or building movement.
- Fire protection: Measures to reduce explosion or fire aggravation risk - manual/automatic isolation, enclosures or heat‑resistant coatings; post‑fire inspection and testing recommended.
- Safety devices: Use of additional devices where required by risk assessment (e.g., excess flow or thermal valves); location and sizing should be optimised.
- Materials and temperature limits: Systems must meet ISO 17484-1 requirements; PE‑X systems are cited as suitable for −20 °C to +60 °C, with manufacturer consultation recommended for prolonged use above 40 °C or below 0 °C.
- Construction and jointing: Follow manufacturer assembly instructions; prevent ingress of contaminants; protect pipework during installation.
- Testing and commissioning: Tightness and strength testing, safe test procedures, and appropriate test fluids and conditions.
- Storage and handling: Recommendations for protecting materials before and during installation to preserve integrity.
Practical applications and users
ISO 17484-2 is relevant for:
- Gas system designers and consulting engineers specifying indoor gas distribution using multilayer plastic pipes
- Installers and contractors performing on‑site assembly, jointing and testing
- Manufacturers and product specifiers developing multilayer piping systems and fittings
- Building services engineers, gas utilities and safety regulators assessing compliance with safe installation practice
Typical applications include domestic and commercial gas distribution inside buildings where alternatives to steel and copper are considered for ease of installation and cost-effectiveness.
Related standards
- ISO 17484-1 - Specifications for multilayer pipe systems for indoor gas installations (mandatory companion document)
- National installation codes and standards (take precedence over ISO where applicable)
Keywords: ISO 17484-2:2009, multilayer pipe systems, indoor gas installations, plastics piping systems, code of practice, MOP 5 bar, PE‑X, gas pipe installation, pressure testing.