ISO 15876-1:2017

Overview

ISO 15876-1:2017 - "Plastics piping systems for hot and cold water installations - Polybutene (PB) - Part 1: General" defines the general framework for piping systems made from polybutene-1 (PB-1). The standard covers PB pipes, fittings and joints (including joints with other plastics and non‑plastic components) used for domestic water supply and heating systems inside buildings. It sets the scope for service conditions, application classes, pipe dimension classes and the test parameters referenced in the other parts of the ISO 15876 series.

Key topics and requirements

• Material definition and classification: Distinguishes polybutene homopolymer (PB‑H) and polybutene random copolymer (PB‑R) and addresses material-related aspects such as reprocessable material and crystallisation.
• Service conditions and application classes: Specifies a range of application classes (service conditions) and associated limits for design temperature (TD), maximum design temperature (Tmax) and malfunction temperature (Tmal). Values beyond the tabulated limits do not apply.
• Design pressure and pipe dimension classes: Details selection principles for design pressure, pipe series (S) and pipe dimensioning; includes guidance for nominal sizes (DN/OD) and wall thickness considerations.
• System performance and terminology: Defines key terms and symbols used across the system standard - e.g., design stress, hydrostatic stress, and lower confidence limit of predicted hydrostatic strength (LPL).
• Test parameters: Specifies the parameters to be used in test methods referenced by the series (material, pipes, fittings and joint tests), while the specific methods and criteria appear in related parts (Parts 2, 3, 5, etc.).
• Purchaser/specifier responsibility: Emphasises that specifiers must choose appropriate application classes, design pressures/temperatures and account for national regulations and installation codes.

Practical applications

ISO 15876-1 is applicable to:

• Hot and cold water distribution systems in residential, commercial and light industrial buildings
• Heating systems (central heating circuits) using treated or potable water
• Selection and specification of PB pipework, fittings and approved jointing systems

Who benefits:

• Plumbing and mechanical engineers specifying piping systems
• Manufacturers of polybutene (PB) pipes and fittings
• Installers and system designers seeking compliant materials and jointing methods
• Specifiers, purchasers and conformity assessors ensuring fitness for purpose and regulatory compliance

Related standards

• ISO 15876-2: Pipes
• ISO 15876-3: Fittings
• ISO 15876-5: Fitness for purpose of the system
• ISO/TS 15876-7: Conformity assessment guidance
• Related system standards: ISO 15874, ISO 15875, ISO 15877, ISO 21003, ISO 22391

Keywords: ISO 15876-1:2017, polybutene, PB-1, plastics piping systems, hot and cold water installations, design pressure, design temperature, application classes, pipes fittings joints.