ISO/TS 16422-3:2023 PDF

Overview

ISO/TS 16422-3:2023 - "Pipes and joints made of oriented unplasticized poly(vinyl chloride) (PVC‑O) for the conveyance of water under pressure - Part 3: Fittings" specifies the characteristics and test parameters for solid‑wall oriented PVC‑O fittings. It covers double sockets, repair couplings, reducers and non‑end load bearing elbows intended for buried or protected above‑ground water, drainage, sewerage, treated wastewater and irrigation systems. The document is intended to be used alongside ISO 16422‑1 and ISO 16422‑5 for full system requirements.

Key topics and technical requirements

• Scope and applicability
  • Fittings for PVC‑O piping systems for water under pressure (cold water up to and including 25 °C; components up to 45 °C).
  • Design pressures up to 25 bar; includes considerations for impact loads and pressure fluctuations.
  • Excludes tees, flange adaptors and end‑load bearing fittings (restrained gaskets and ISO 16422‑5 apply for end‑load solutions).
• Material and orientation
  • Requirements for oriented unplasticized PVC (PVC‑O) material, including density and circumferential orientation factor.
  • Background on molecular orientation: improved hoop strength, impact and fatigue resistance through controlled stretching of PVC‑U preforms.
• Geometrical and physical characteristics
  • Design lengths, bend radii, nominal outside diameters, wall thickness and opacity/colour requirements.
  • Specific guidance for fittings with integral sockets and elastomeric sealing rings.
• Mechanical and performance testing
  • Test parameters and methods for resistance to hydrostatic pressure, long‑term hydrostatic strength (Annex A), and determination of orientation (Annex B).
  • Requirements for sealing rings and joint performance.
• Marking and documentation
  • Minimum and additional marking requirements to ensure traceability and correct use.

Practical applications

ISO/TS 16422-3:2023 is applicable to:

• Water mains and service lines
• Building water supply (internal and external)
• Pressurized drainage, sewerage and treated wastewater systems
• Irrigation under pressure

It is suited for projects where improved mechanical performance (reduced wall thickness, higher hoop strength, impact resistance) of PVC‑O fittings is desired.

Who should use this standard

• PVC‑O fittings manufacturers and product developers
• Water utility engineers and pipeline designers
• Specifiers, procurement teams and standards compliance officers
• Test laboratories, certification bodies and installers

Related standards

• ISO 16422‑1 (General)
• ISO 16422‑2 (Pipes - dimensional and temperature guidance)
• ISO 16422‑5 (Fitness for purpose - restrained gaskets and end‑load bearing requirements)
• Referenced test standards such as ISO 1167, ISO 9080 and ISO 3126 for pressure and dimensional tests.

Keywords: ISO/TS 16422-3:2023, PVC‑O fittings, oriented PVC‑O, fittings for water under pressure, double sockets, repair couplings, reducers, hydrostatic strength.