ISO 10931:2005

Overview

ISO 10931:2005 defines requirements for plastics piping systems made from poly(vinylidene fluoride) (PVDF) used in above‑ground industrial applications. The standard covers pipes, fittings, valves and ancillary equipment, their joints (including joints with other plastics and non‑plastics), and system‑level requirements for safe, long‑term conveyance of liquids, gases and solid‑in‑fluid media. It is applicable for service temperatures up to 150 °C (with caution and manufacturer advice for temperatures above 120 °C) and is intended for designers, manufacturers, certifiers and users of PVDF piping systems.

Key topics and technical requirements

• Material requirements: PVDF material characteristics, virgin and reprocessable materials, and related material definitions.
• Geometrical characteristics: nominal sizes, outside/inside diameters, wall thickness, SDR and pipe series (S) definitions and tolerances.
• Mechanical and physical properties: performance under internal pressure, long‑term hydrostatic strength concepts (e.g., MRS - minimum required strength), and design stress considerations.
• Chemical and electrical characteristics: resistance considerations for conveyed media and electrical protection/installation guidance where applicable.
• Performance, classification and testing: requirements for component performance, classification of components, and referenced test methods (e.g., hydrostatic and pressure tests; see normative references such as ISO 1167 and ISO 9080).
• System design and installation: guidance on designing thermoplastics piping systems for industrial use and on correct installation practices.
• Marking and declaration: requirements for marking components and declaring compliance with the standard.
• Manufacture and ancillary guidance: production controls and an informative Annex A with specific PVDF characteristics and requirements.

Practical applications and who uses ISO 10931:2005

Typical industrial applications include:

• Chemical plants and aggressive‑fluid handling
• Industrial sewerage engineering
• Power plant cooling and general water systems
• Electroplating, pickling and surface‑treatment plants
• Semiconductor manufacturing
• Agricultural production facilities
• Water treatment installations

Primary users:

• Design engineers specifying PVDF piping systems
• Manufacturers of PVDF pipes, fittings and valves
• Certification and inspection bodies performing compliance checks
• Testing laboratories executing referenced test methods
• Plant operators and maintenance teams ensuring safe installation and service

Related standards

ISO 10931 references and complements many ISO/IEC standards relevant to threads, dimensions and test methods (for example, ISO 1167, ISO 9080, ISO 3126) and points to valve standards for thermoplastic valves (ISO 16135–16139 series and others). Users should consult these normative references when specifying or testing PVDF systems.

Keywords: ISO 10931:2005, PVDF piping systems, plastics piping systems, industrial applications, pipes fittings valves, thermoplastics, hydrostatic strength, MRS, SDR, pipe series.