ISO 20421-1-2019 amd1-2022 PDF

Full title and description

St ISO 20421-1-2019 amd1-2022 — Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design, fabrication, inspection and testing — Amendment 1. This document is Amendment 1 (2022) to ISO 20421-1:2019 and updates specific design, fabrication, inspection and testing requirements for large transportable vacuum‑insulated cryogenic vessels.

Abstract

This amendment revises and clarifies selected technical requirements of ISO 20421-1:2019 for large transportable vacuum‑insulated cryogenic vessels (typically >450 L), including changes to tables and clauses that affect minimum wall‑thickness calculations, material and fabrication criteria, inspection tolerances and testing procedures. It is a short amendment (published April 2022) intended to be read together with ISO 20421-1:2019.

General information

• Status: Published (Amendment to ISO 20421-1:2019).
• Publication date: April 2022 (published 11 April 2022 as Amendment 1, 2022).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.020.40 — Cryogenic vessels.
• Edition / version: Edition 2 of ISO 20421‑1 (2019) with Amendment 1 (2022).
• Number of pages: 3 (amendment document).

Scope

The amendment applies to ISO 20421-1:2019, which specifies requirements for the design, fabrication, inspection and testing of large transportable vacuum‑insulated cryogenic vessels (generally for volumes greater than about 450 litres) that are permanently or not permanently attached to a means of transport. ISO 20421-1 (and this amendment) excludes vessels designed for toxic fluids; transport by public road, rail, sea or air may require additional regulatory provisions. The amendment updates selected technical tables and clauses and is intended to be used together with the 2019 edition.

Key topics and requirements

• Revisions to numerical tables used in design calculations (e.g., replacement/updates of Table 3 and related entries).
• Updated rules for minimum wall thickness calculations based on material properties and vessel geometry.
• Clarified material requirements and allowable property limits (stainless steels, aluminium alloys, etc.).
• Refinements to fabrication and welding requirements to preserve vacuum integrity and structural strength.
• Revised inspection and testing tolerances (including out‑of‑roundness and safety factors for different geometry regions).
• Guidance on inspection, non‑destructive testing and final acceptance testing following fabrication and before commissioning.

Typical use and users

Used by designers, manufacturers and fabricators of large transportable vacuum‑insulated cryogenic vessels; third‑party inspectors and testing organizations; industrial gas producers and distributors; LNG and cryogenic transport operators; engineering consultancies; and laboratories and facilities that specify, purchase or maintain cryogenic storage and transport equipment. The amendment is applied when the project or product references ISO 20421‑1:2019 to ensure the amended numeric criteria and tolerances are followed.

Related standards

ISO 20421-1:2019 (base document — Design, fabrication, inspection and testing) and other parts of the ISO 20421 series (for example ISO 20421-2:2017 — Operational requirements). The amendment should be used in combination with the 2019 edition and with any other applicable national or international transport and pressure‑equipment regulations.

Keywords

cryogenic vessels, vacuum‑insulated, transportable tanks, design, fabrication, inspection, testing, amendment 2022, ISO 20421, large transportable vessels, minimum wall thickness, material requirements

FAQ

Q: What is this standard?

A: This item is Amendment 1 (2022) to ISO 20421‑1:2019 — the international standard that sets design, fabrication, inspection and testing requirements for large transportable vacuum‑insulated cryogenic vessels.

Q: What does it cover?

A: It updates specific technical requirements in ISO 20421‑1:2019, such as numeric tables, minimum thickness calculations, material and fabrication criteria, inspection tolerances and testing procedures. The amendment itself is short (3 pages) and must be read together with the 2019 edition.

Q: Who typically uses it?

A: Vessel designers and fabricators, inspection and testing bodies, industrial gas and LNG equipment suppliers, transport operators and engineering teams responsible for procurement, certification and maintenance of large cryogenic transportable vessels.

Q: Is it current or superseded?

A: The amendment was published in April 2022 and is current as an amendment to ISO 20421‑1:2019. ISO has indicated work toward a subsequent DIS (ISO/DIS 20421‑1) in the standards development pipeline, so users should watch for a future revision that may consolidate changes. Always confirm whether a later consolidated edition has been published before finalizing designs or procurement.

Q: Is it part of a series?

A: Yes — ISO 20421 is a multipart series covering large transportable vacuum‑insulated cryogenic vessels; Part 1 covers design/fabrication/inspection/testing and Part 2 covers operational requirements (ISO 20421‑2:2017), with the amendment applying specifically to Part 1.

Q: What are the key keywords?

A: Cryogenic vessels; vacuum‑insulated; transportable tanks; design; fabrication; inspection; testing; ISO 20421; amendment 2022; material requirements; minimum wall thickness.