ISO 17885:2021

Overview

ISO 17885:2021 specifies requirements and test methods for mechanical fittings used to join plastic pressure piping systems, including transition fittings to metal pipes. It covers applications for the supply of gaseous fuels (GAS), water for human consumption and general use (W/P), irrigation (I) and industrial services (IS). The standard applies only to fittings with operating temperature and pressure limits set by the relevant system standards. Not covered: flanges, mechanical fittings for hot/cold water systems inside buildings and district heating.

Key topics and technical requirements

ISO 17885:2021 provides a unified framework for evaluating and documenting mechanical fittings. Major technical topics include:

• Materials: requirements and verification for plastics, metals, elastomers, and permitted lubricants/greases.
• Manufacturer’s declaration: specifying the intended field of application (GAS, W/P, I, IS) and any operating limits.
• Geometrical and physical characteristics: dimensional, appearance, colour, weathering protection and thread requirements.
• Performance requirements and test methods: verification of pressure resistance of fitting bodies, assembly testing, long‑term behaviour of plastics (MRS evaluation), cyclic testing and resistance to specific media (e.g., gas constituents).
• Application‑related checks: effects on water quality, chemical resistance for industrial use, and transition fitting behavior with metal pipes.
• Product marking and packaging: identification, traceability and packaging requirements to support installation and regulatory compliance.
• Normative and informative annexes: include lists of pipe standards (Annex A) and detailed test procedures/parameters (Annexes B–G).

Practical applications

ISO 17885:2021 is used to:

• Ensure mechanical fittings meet safety, durability and leak tightness requirements for pressure piping systems.
• Provide harmonized test methods for manufacturers and third‑party test labs to demonstrate conformity.
• Support specifiers and purchasers in selecting fittings that are suitable for gas distribution, potable water, irrigation and industrial fluid transport.
• Aid regulatory bodies, utilities and infrastructure project teams to set procurement and acceptance criteria.

Who should use this standard

• Fitting manufacturers and product designers
• Test laboratories and certification bodies
• Pipeline and distribution system engineers and specifiers
• Utilities, installers and procurement teams seeking compliant components

Related standards

ISO 17885 references and aligns with other ISO standards for pipe materials and tests, for example: ISO 1167 (resistance to internal pressure), ISO 3451‑4, ISO 3458, ISO 7‑1, ISO 228‑1, ISO 306 and ISO 1133‑1. Annex A lists relevant pipe standards for which these mechanical fittings are suitable.

Keywords: ISO 17885:2021, mechanical fittings, plastics piping systems, pressure piping systems, gas supply, potable water, irrigation, industrial applications, test methods, materials.