ISO 21012:2024

Overview

ISO 21012:2024 - Cryogenic vessels - Hoses defines requirements for the design, construction, testing and marking of cryogenic hoses used to transfer low-temperature fluids. It covers both non‑insulated cryogenic flexible hoses and insulated vacuum‑jacketed hoses intended to operate in the temperature range −270 °C to +65 °C and nominal sizes DN 10 to DN 100. End fittings for mounting couplings are included, while couplings themselves are covered by other standards.

Key technical topics and requirements

• Scope and application: Hoses for transfer of cryogenic fluids; DN 10–100 and the specified working temperature range.
• Design & construction (Clause 4.1): Requirements for corrugated metal, elastomer or plastic inner tubes; braids/protection coils; secure end fittings and marking area.
• Materials (Clause 4.2): Material compatibility with conveyed fluids, documented chemical and physical properties, and manufacturer control per recognized specifications.
• Cleanliness (Clause 4.3): Cleanliness for cryogenic service is mandated to avoid contamination-related hazards.
• Mechanical properties (Clause 4.4): Includes burst pressure, pressure cycling, bending and rolling‑bend tests, resistance to abuse, low‑temperature resistance, leak tightness, and electrical properties.
• Testing:
  • Hose sample tests (Clause 5): Non‑destructive and destructive tests (pressure, leak, crushing, hydraulic burst, rolling‑bend cycles).
  • Production testing (Clause 6): Routine pressure and leak tests on manufactured assemblies.
• Marking, cleaning and documentation: Marking of rated pressure and identification, cleaning procedures (Clause 8), periodic examination guidance (Clause 9), and mandatory test certificate (Clause 10).
• Annexes: Informative and normative annexes include typical assemblies, rolling‑bend tests, periodic examination guidelines and a new Annex E on acceptable materials.

Practical applications and users

ISO 21012:2024 is intended for:

• Manufacturers of cryogenic hoses and hose assemblies
• Designers and integrators of cryogenic piping and vessel systems
• Plant and maintenance engineers responsible for cryogenic transfer equipment
• Inspection, testing and quality assurance personnel
• Procurement and regulatory bodies specifying safety and conformity for cryogenic fluid transfer

Typical applications include transfer lines for liquefied gases and cryogenic services in industrial gas supply, research facilities, and any systems requiring safe, tested hoses for sub‑ambient cryogenic fluids.

Related standards (normative references)

• ISO 7369 - Vocabulary for metal hoses
• ISO 10806 - Fittings for corrugated metal hoses
• ISO 21010 - Cryogenic gas/material compatibility
• ISO 21028‑1 - Toughness requirements at cryogenic temperatures
• ISO 23208 - Cleanliness for cryogenic service

Keywords: ISO 21012:2024, cryogenic hoses, vacuum jacketed hoses, DN 10–100, −270 °C to +65 °C, hose testing, burst pressure, leak tightness, cryogenic hose standards.