IACS UR Z17 Compliance for Inspection Service Providers
Firms not employed by a classification society whose measurement, test or maintenance results a class surveyor relies on when making decisions affecting classification or statutory certification. Personnel are qualified under employer-based certification, so a contracted Level III can sign the written practice and administer examinations for the firm.
For NDT businesses the binding categories are thickness measurement on ships and mobile offshore units (excluding non-ESP ships under 500 gross tonnage and all fishing vessels), in-water survey by diver or ROV, ultrasonic tightness testing of closing appliances, remote inspection techniques, and tightness testing of membrane gas carrier barriers. UR Z17 sets the minimum requirements every IACS member society applies before it will accept a service supplier's results. The firm — not the individual technician — is approved. It must submit a company outline, personnel and equipment records, work procedures, training programmes, report formats and a quality manual; pass a document review; pass an on-site audit; and pass a practical demonstration of the actual service. Approval is granted per service category and per station: where a company owns several servicing stations, each is assessed and approved separately. Subcontractors performing the approved service must themselves meet Section 5. Every report issued must include a copy of the Certificate of Approval.
Source: IACS UR Z17 Rev.21, January 2025 — full 41-page text (Sections 1–9 plus Annex 1) read clause by clause from the ClassNK-hosted copy of the IACS requirement. The revision history in that text records Rev.19 and Rev.20 for uniform implementation by IACS Societies from 1 January 2026 and Rev.21 from 1 July 2026. Verified August 2026.
| Item | What applies | Why it matters |
|---|---|---|
| Authority | International Association of Classification Societies (IACS); applied and enforced by each IACS Member class society | The body that issues, audits and can withdraw |
| Applies to | Firms not employed by a classification society whose measurement, test or maintenance results a class surveyor relies on when making decisions affecting. | Whether this binds your firm at all |
| Personnel certification | Employer-based — the firm certifies its own, under a qualified Level III | Decides whether an outsourced Level III can sign for you |
| Renewal | Renewal or endorsement of the Certificate of Approval at intervals not exceeding five years by verification audit (6.2), or on expiry of the supplier's manufacturer approval where that applies, whichever comes first. For firms engaged in thickness measurements the interval must not exceed three years. Individual societies may impose shorter intervals and intermediate audits; failure to undergo a required intermediate audit is listed as grounds for cancellation under 8.2.4. | Diarise from the certificate date, not from memory |
| Methods in scope | UT (ultrasonic thickness measurement), UT (ultrasonic tightness and leak testing), VT (close-up and remote visual), AE (acoustic emission), IRT (infrared/thermographic testing), MT | Each method needs its own procedure and qualified personnel |
| Industries | Marine classification and statutory survey, Shipyards and ship repair, Ship owners and managers, Mobile offshore units, LNG and membrane gas carriers | Where this regime shows up in contracts |
Who does IACS UR Z17 apply to?
Firms not employed by a classification society whose measurement, test or maintenance results a class surveyor relies on when making decisions affecting classification or statutory certification. For NDT businesses the binding categories are thickness measurement on ships and mobile offshore units (excluding non-ESP ships under 500 gross tonnage and all fishing vessels), in-water survey by diver or ROV, ultrasonic tightness testing of closing appliances, remote inspection techniques, and tightness testing of membrane gas carrier barriers.
Can an outsourced Level III sign for IACS UR Z17 compliance?
Yes. IACS UR Z17 accepts employer-based certification, which places the obligation on the employer and allows a contracted Level III to write and sign the written practice, approve procedures and administer examinations. The Level III must be qualified in each method they sign for, and the employer still owns the records.
What documents does a IACS UR Z17 audit ask for?
Outline of company — organisation and management structure, including subsidiaries to be covered by the approval, List of nominated agents, subsidiaries and subcontractors, List of operators/technicians/inspectors documenting training, experience and qualifications to recognised national, international or industry standards, Description of the equipment used for the service, plus a guide for operators of that equipment, Training programmes for operators/technicians/inspectors. Auditors open records before they open manuals, because a manual describes intent while records show practice. The most common failure is a documented system that does not match what the technicians actually do.
How often is IACS UR Z17 renewed?
Renewal or endorsement of the Certificate of Approval at intervals not exceeding five years by verification audit (6.2), or on expiry of the supplier's manufacturer approval where that applies, whichever comes first. For firms engaged in thickness measurements the interval must not exceed three years. Individual societies may impose shorter intervals and intermediate audits; failure to undergo a required intermediate audit is listed as grounds for cancellation under 8.2.4. Firms that diarise renewal from the certificate date rather than from the last audit avoid the lapse that forces a full reapplication.
What are the most common IACS UR Z17 findings?
Operator or supervisor certificates on file do not cover the method or level the relevant Annex 1 category requires, No evidence of the minimum one year of tutored on-the-job training for operators required by 5.2.2, Equipment records missing maintenance history or the results of calibration and verification (5.2.5), Reports issued without a copy of the Certificate of Approval attached, which 5.2.11 requires. These recur because they are records problems rather than capability problems — the work is being done correctly and the evidence is not being kept.
Which NDT methods does IACS UR Z17 cover?
UT (ultrasonic thickness measurement), UT (ultrasonic tightness and leak testing), VT (close-up and remote visual), AE (acoustic emission), IRT (infrared/thermographic testing), MT, PT. Each method in scope needs its own approved procedure and personnel qualified in that specific method; a Level III qualified in ultrasonics cannot sign for radiography.
Personnel certification under IACS UR Z17
Employer-based, with a third-party overlay. Under 5.2.2 the supplier itself qualifies and trains its personnel to a recognised national, international or industry standard; operators need at least one year of tutored on-the-job training and supervisors at least two years' experience as an operator. For thickness measurement, Annex 1 gives EN 473 or ISO 9712 Level II for the supervisor and Level I for operators as examples of an acceptable standard. Annex 1 Section 15 names ASNT SNT-TC-1A explicitly alongside ISO 9712, but requires SNT-TC-1A holders to evidence that training was administered by an independent training body centrally certified to ASNT. An outsourced Level III can author and approve procedures and act as technical authority, but cannot replace the operator and supervisor certificates the audit inspects.
The audit sequence
- Application to an IACS member society for a named service category listed in Annex 1
- Document review of the 5.1.1 submission — quality manual, work procedures, personnel and equipment records
- On-site audit under 5.3 to confirm the firm is organised and managed in accordance with the submitted documents and is capable of the service
- Practical demonstration of the specific service under 5.4, with satisfactory reporting; at renewal this may be verified by documentary review of jobs already accepted by a QSCS-verified society
- Issue of a Certificate of Approval under 6.1 stating the type and scope of services and any limitations or restrictions
- Renewal or endorsement audit under 6.2; any alteration to the certified service operating system must be reported immediately (Section 7)
Documents an auditor asks for
- Outline of company — organisation and management structure, including subsidiaries to be covered by the approval
- List of nominated agents, subsidiaries and subcontractors
- List of operators/technicians/inspectors documenting training, experience and qualifications to recognised national, international or industry standards
- Description of the equipment used for the service, plus a guide for operators of that equipment
- Training programmes for operators/technicians/inspectors
- Check lists and record formats for recording the results of the services referred to in Annex 1
- Quality Manual and/or documented procedures covering the items listed in 5.5
- Documented procedures for communication with the crew before commencing work, so equipment can be safely decommissioned
- Record of customer claims and of corrective actions requested by certification bodies
- Operators' documented acknowledgement of the code of conduct
Findings firms get against IACS UR Z17
- Operator or supervisor certificates on file do not cover the method or level the relevant Annex 1 category requires
- No evidence of the minimum one year of tutored on-the-job training for operators required by 5.2.2
- Equipment records missing maintenance history or the results of calibration and verification (5.2.5)
- Reports issued without a copy of the Certificate of Approval attached, which 5.2.11 requires
- Subcontractors used on approved work with no evidence they meet the requirements of Section 5 (5.2.9)
- Thickness measurement or reporting software not documented and confirmed as fit for the intended application before first use (5.2.6)
- Alterations to the certified service operating system — new offices, new operators, revised procedures — not notified to the society (Section 7)
- A second servicing station operating under the parent certificate without having been separately assessed and approved (5.2.7)
Related: the IACS UR Z17 overview, outsourced ASNT Level III cover, written practice development, NDT procedure development, a programme gap assessment, interim Level III cover.