ISO 21601-2013 PDF

Full title and description

Corrosion of metals and alloys — Guidelines for assessing the significance of stress corrosion cracks detected in service. This International Standard provides guidance on the steps to follow after a stress corrosion crack (SCC) is found in service so that the implications for structural integrity can be assessed and managed appropriately.

Abstract

ISO 21601:2013 gives guidelines for evaluating the significance of stress corrosion cracks detected in-service, including considerations for inspection, assessment of crack severity, monitoring and documentation. It emphasises that any evaluation should be performed in the context of the consequences of failure and appropriate risk-based management methods; application‑specific risk decisions are outside the scope of the standard.

General information

• Status: Published. (Confirmed current as of ISO review activity.)
• Publication date: April 2013 (2013-04).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.060 (Corrosion of metals and alloys).
• Edition / version: Edition 1 (2013).
• Number of pages: 19 pages.

Scope

ISO 21601:2013 covers guidance on the appropriate steps to take when a stress corrosion crack has been detected in service and on how to assess the implications of that crack for structural integrity. The standard describes assessment principles, inspection and monitoring approaches, and reporting considerations, but it does not provide application-specific risk acceptability criteria or prescriptive remedies — those decisions are to be made using risk-based management methods by the responsible parties.

Key topics and requirements

• Identification and characterisation of stress corrosion cracks (SCC) and associated damage mechanisms.
• Guidance on initial response, inspection frequency and monitoring after SCC detection.
• Assessment principles for judging the significance of detected cracks with respect to structural integrity and safe operation.
• Recommendations for documentation, reporting and communication of findings to asset management and safety stakeholders.
• Contextualisation of assessments within risk-based management frameworks (note: specific acceptance criteria and remedial actions are outside the standard’s scope).

Typical use and users

Used by corrosion and materials engineers, structural and mechanical integrity engineers, inspection and NDT specialists, asset integrity managers, maintenance planners and regulatory/compliance personnel to guide post-detection assessment and decision-making when SCC is found in equipment, pipelines, tanks or structures. It supports fitness‑for‑service evaluations and inspection programmes.

Related standards

Commonly referenced and complementary documents include API 579-1/ASME FFS-1 (fitness-for-service assessment guidance), ISO 15156 / NACE MR0175 (materials selection and cracking-resistance in H2S-containing environments) and other ISO corrosion-series standards such as ISO 8044 (corrosion vocabulary) and ISO 8407 (removal of corrosion products from test specimens). These publications are often used together with ISO 21601 when evaluating SCC and making repair or continued‑service decisions.

Keywords

stress corrosion cracking; SCC; corrosion of metals and alloys; crack assessment; inspection; nondestructive testing; structural integrity; fitness-for-service; risk-based inspection; ISO/TC 156.

FAQ

Q: What is this standard?

A: ISO 21601:2013 is an International Standard providing guidelines for assessing the significance of stress corrosion cracks detected in service.

Q: What does it cover?

A: It covers the recommended sequence of actions after SCC detection (inspection, characterisation, assessment and monitoring), guidance on judging significance for structural integrity, and documentation/reporting practices; it does not set prescriptive acceptability criteria or application‑specific risk thresholds.

Q: Who typically uses it?

A: Corrosion/materials engineers, NDT inspectors, integrity engineers, maintenance and asset managers, and safety/regulatory personnel involved in evaluating and managing cracked metallic components in service.

Q: Is it current or superseded?

A: ISO 21601:2013 was published in April 2013 and, per ISO metadata, was reviewed (confirmed) during its scheduled review cycle and remains the published edition. Users should check the ISO catalogue or national standards body for any amendments or revisions if absolute currentness is required.

Q: Is it part of a series?

A: ISO 21601 is a standalone International Standard within ISO’s corrosion portfolio (ISO/TC 156) and is commonly used alongside related standards (for example, ISO 15156 / NACE MR0175, API 579/ASME FFS-1, ISO 8044, ISO 8407) depending on the application and industry.

Q: What are the key keywords?

A: Stress corrosion cracking (SCC), crack assessment, corrosion of metals and alloys, inspection, NDT, structural integrity, fitness-for-service, risk-based inspection.