ISO 16422-5:2024

Overview

ISO 16422-5:2024 - "Pipes and joints made of oriented unplasticized poly(vinyl chloride) (PVC-O) for the conveyance of water under pressure - Part 5: Fitness for purpose of the system" specifies how PVC-O piping systems and their joints must perform to be considered fit for purpose. It covers solid-wall PVC-O pipes, fittings and joints used underground or above ground (when protected from direct sunlight) for water supply, buried drainage, sewerage, treated wastewater and irrigation under pressure. The standard applies to systems for cold water (up to and including 25 °C) and to components up to 45 °C, and to system pressures up to 25 bar.

Key topics and technical requirements

• Scope and applicability: PVC-O pipes, PVC-O/PVC-U fittings, joints with other plastics, metals or GRP for water mains, service lines, building water supply, pressurised drainage, sewerage and irrigation.
• Temperature and pressure limits: Intended for cold water up to 25 °C and system pressures up to 25 bar; components may be used up to 45 °C (see ISO 16422-2 for intermediate temperature guidance).
• Fitness-for-purpose criteria: Defines required performance of joints and full piping assemblies rather than on-site testing procedures.
• Joint classifications:
  • Non-end-load-bearing joints (e.g., elastomeric-sealing-ring sockets) - specific leaktightness and long-term pressure tests apply.
  • End-load-bearing joints (e.g., flanged assemblies, special couplings) - additional mechanical load and bending tests apply.
• Test methods referenced or specified:
  • Short-term leaktightness under internal pressure with angular deflection (based on ISO 13845)
  • Short-term leaktightness under negative pressure with angular deflection and deformation (based on ISO 13844)
  • Long-term leaktightness under internal water pressure (ISO 13846)
  • Short-term positive/negative pressure tests with bending for certain joint types
• Assembly types covered: Integrally socketed pipe-to-pipe, PVC-O/PVC-U fittings, metal/GRP adaptors, valves, tapping saddles and mechanical couplings assembled with corresponding PN-rated pipes.

Practical applications and users

ISO 16422-5:2024 is designed for:

• Pipe manufacturers and compound formulators validating PVC-O product families
• System designers and civil/water engineers specifying pressurised water and wastewater piping
• Water utilities and contractors assessing fitness for purpose, pressure fluctuation and impact resistance
• Testing laboratories performing leaktightness and long-term pressure testing of assemblies
• Regulators and procurement teams referencing accepted standards for infrastructure projects

This part is best used in conjunction with ISO 16422-1, ISO 16422-2, ISO/TS 16422-3 and ISO 1452-3 to create a complete compliance and specification package for PVC-O pressure piping systems.

Related standards

• ISO 16422-1 (General)
• ISO 16422-2 (Pipes)
• ISO/TS 16422-3 (Fittings)
• ISO 1452-3 / ISO 1452-4 (PVC-U fittings and valves)
• ISO 13844, ISO 13845, ISO 13846 (test methods referenced)