ISO 21009-1:2022

Overview

ISO 21009-1:2022 - Cryogenic vessels - Static vacuum‑insulated vessels - Part 1: Design, fabrication, inspection and tests specifies requirements for the safe design, manufacture, inspection and testing of static vacuum‑insulated cryogenic vessels designed for a maximum allowable pressure (MAWP) greater than 0.5 bar. It applies to vessels for cryogenic fluids (excluding vessels designed for toxic fluids) and provides guidance for vessels with MAWP of 0.5 bar or less. The standard covers mechanical, chemical and thermal effects, materials, detailed design methods, fabrication processes and acceptance testing.

Key topics and requirements

• Scope and definitions: Terms, symbols and applicability for static vacuum‑insulated cryogenic vessels.
• Mechanical loads & thermal conditions: Design loads, pressure test loads and thermal effects specific to cryogenic service.
• Materials: Selection, material properties at low temperature, inspection certificates and special materials (including provisions for 9 % Ni and austenitic stainless steels in annexes).
• Design methods: Options for design by calculation, pressure strengthening, and experimental supplementation; design of inner vessels, outer jackets, supports, openings, piping and accessories.
• Fabrication: Cutting, cold/hot forming, welding qualifications, tolerances and non‑welded joints.
• Inspection & tests: Quality plans, production control plates, non‑destructive testing (NDT), pressure testing and acceptance criteria; rectification procedures and pressure relief requirements.
• Marking, final assessment & periodic inspection: Labelling, documentation and in‑service inspection intervals.
• Annexes: Normative/ informative annexes cover elastic stress analysis, pressure strengthening, relief systems, weld details, outer jacket relief devices and calculation guidance for shells, openings and ends.

Applications

This standard is essential for industries and installations that design, build or operate stationary cryogenic storage and handling equipment where vacuum insulation is used to limit heat ingress. Typical uses include design and qualification of bulk cryogenic storage vessels, stationary tanks at plants, and associated piping and relief systems for cryogenic fluids.

Who should use this standard

• Design and mechanical engineers performing calculations for cryogenic vessels
• Fabrication shops and welders producing vacuum‑insulated tanks
• Quality and inspection teams performing NDT and pressure tests
• Plant operators and maintenance personnel responsible for in‑service inspection and periodic checks
• Regulatory authorities and certification bodies assessing compliance with cryogenic vessel requirements

Related standards

For comprehensive compliance, ISO 21009-1 should be used alongside other standards on pressure vessels, material specifications and safety devices (pressure relief systems, welding codes and low‑temperature material standards). Use this document as the primary reference for vacuum‑insulated cryogenic vessel design, fabrication, inspection and testing.