02 / Thickness measurement baseline
UTM Handbook / Guided scope
Your question.
The right reference.
Describe your survey. Review the case details and open a summary linked to the actual rule tables.
ClassNK, ABS and DNV use separate controlled rule engines. Ask in English and include the class, survey and vessel construction when known. Each answer retains the conditions and exceptions of its own class rules.
01 / Your survey details
Confirm your survey details.
Check the vessel type and other details against the survey status / job scope. Use the Special Survey number shown in the survey status. Annual and Intermediate also need the age band. The need for a previous Special depends on vessel family and age; gas carriers use their own Intermediate route. CAP is a separate selection. These paths cover conventional steel oil tankers, chemical carriers with integral tanks, bulk/ore carriers, steel-hull gas carriers and general cargo ships. Select the actual hull construction. Gas cargo-containment tests have a separate reference. Dual-service applicability and combination carriers need separate review.
Rule summary · vessel scope not final
ClassNK · Special III
Source edition: June 2026. Source comparison: 13 September 2026. Confirm the applicable edition and selected locations in the vessel Survey Programme.
Requirements and conditions for this survey occasion
Internal examinations linked to this survey
03 / Close-up areas
Close-up survey
Complete rings and bulkheads include adjacent structure. Open the location details below for the definitions.
Part B · B5.5-1, double hull · page 138Member and tank definitions · PDF 139CSR / See the rule on the structure
What does this mean on the drawing?
Choose a structure, then tap a numbered explanation. The diagram shows a rule example; it does not select locations on your vessel.
The diagram could not be loaded. The explanation and original source link remain available.
ClassNK Part B, June 2026 · Figures B5.7-B5.10. Original drawing symbols are unchanged. Coloured regions and numbered controls are our explanatory overlay, not additional measuring points. These patterns apply to CSR-T / CSR-B&T tankers.
Apply the baseline to the job
Plan and carry out the measurements
Corrosion, extensions and strength assessment
For substantial-corrosion extensions, use the relevant member rows and all their conditions:
- B5.11 · bottom and hopper · PDF pages 148-149
- B5.12 · deck · PDF pages 149-150
- B5.13 · side shell and longitudinal bulkheads · PDF pages 150-151
- B5.14 · transverse/swash bulkheads; tank-type exclusions apply · PDF page 151
Extensions depend on the affected members and the survey findings. This guide does not calculate renewal decisions or certify hull strength.
Additional measurements when substantial corrosion is found
Use this conditional reference after substantial corrosion has been established under the applicable criteria. Choose the affected tank type and structure; the listed patterns supplement the baseline.
The reference keeps extent and point pattern together. Confirm actual members and locations in the agreed survey scope; this page makes no renewal or acceptance calculation.
Part B · 5.2.6-3 · PDF 130Non-CSR selected: the CSR point patterns are not applied. Agree the required point layout with the surveyor using the applicable class instructions and approved reporting format.
Prepare the measurement record
04 / Before finalising the scope
Class, CAP and this vessel
ClassNK · what CAP coversConfirm the applicable edition, tank/section locations, previous findings and any class instructions for this vessel. Where required by 1.4.2-2, use the agreed Survey Programme. This guide has not read or approved vessel documents.
Part B Guidance · Survey Programme · PDF page 338 (new tab)ClassNK · TEC-1290 / Survey ProgrammeWhat should I have ready to check?
- Survey status and Survey Programme identifying the vessel.
- Drawings and the previous TM report to identify locations.
- Any agreed CAP scope and additional job instructions.
The cited programme provisions contain the complete document requirements and the restricted-service exception.
This guide covers the UTM baseline and related close-up areas. It is not a complete class-survey checklist or ClassNK approval.