ISO 17637: Non-Destructive Testing - Visual Testing
International standard for visual testing methods and procedures. ISO 17637 covers direct visual inspection, optical magnification, and remote visual techniques.
The International Organization for Standardization (ISO) publishes the globally harmonised counterparts of regional NDT codes; ISO standards are the default outside the United States.
European, Middle Eastern, and Asia-Pacific procurement specifications routinely cite ISO standards directly; CE-marked equipment requires ISO compliance for entry into the EU market.
ISO 17637 is invoked when the scope of work matches its title — non-destructive testing - visual testing — and when the contract or regulatory regime cites it as the controlling document.
Methods covered
Industries
- All Industries
- Personnel qualification: examinations under ISO 17637 must be performed by inspectors qualified and certified to a recognised scheme (typically ASNT SNT-TC-1A, CP-189, or ISO 9712 depending on jurisdiction), with documented training hours, vision tests, and a controlling written practice.
- Written procedure: every examination requires a written, controlled procedure that names the method, equipment, calibration steps, scanning pattern, and acceptance criteria — and is qualified before first use.
- Acceptance criteria: indications are evaluated against the standard's tabulated limits (length, depth, alignment, frequency); any indication exceeding the criteria is recorded, dispositioned, and either repaired or evaluated for fitness-for-service.
- Documentation: examination reports must include enough information for a third party to reproduce the inspection — equipment serial numbers, calibration records, inspector ID, sketches of indications, and the controlling procedure revision.
- Conformity demonstration: where ISO 17637 is invoked under a CE-mark or third-party certification scheme, conformity must be demonstrated through documented examination records reviewed by a notified body.
ISO standards are revised on a five-year systematic-review cycle. Updates to ISO 17637 typically harmonise the document with parallel EN and ASTM publications, expand coverage of digital techniques, and clarify acceptance-criteria tables. EN-ISO dual-numbered standards reflect direct adoption by CEN; an EN-ISO citation is enforceable across the EU.
On a typical All Industries job, ISO 17637 is reproduced inside the inspection company's written procedure, the procedure is qualified for the customer, and each examination report cites the procedure revision back to the controlling clause of the standard.
What does ISO 17637 cover?
ISO 17637 (Non-Destructive Testing - Visual Testing) is published by ISO. International standard for visual testing methods and procedures.
Is ISO 17637 mandatory or voluntary?
ISO 17637 is a consensus standard. It becomes mandatory when invoked by a contract, by another code that cites it (for example ASME Section V calling out an ASTM practice), or by a regulator that has adopted it into law in a specific jurisdiction.
Who is qualified to perform inspections under ISO 17637?
Inspections under ISO 17637 must be performed by personnel qualified and certified to a recognised NDT certification scheme — most commonly ASNT SNT-TC-1A or CP-189 in the United States, ISO 9712 in much of the rest of the world, and NAS 410 for aerospace work. The written practice that controls qualification must be in place before any examination is started.
Which other standards are commonly cited alongside ISO 17637?
ISO 17637 is most often cited together with the parent code that brings it into the contract — typically ASME Section V or VIII for U.S. pressure equipment, AWS D1.1 for structural welding, API 510/570/653 for in-service petroleum equipment, or the matching EN/ISO standard for European and international work.
Standard Code
ISO 17637
Organization
ISO
Methods Covered
1 method(s)
Industries
1 sector(s)
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