Thickness Measurement (Ultrasonic Thickness Measurement, UTM)
The ESP Code and UR Z10 govern specific bulk-carrier/tanker categories; for other ships UTM extent, diminution limits and acceptance criteria follow applicable class Rules.
Operational Explanation
The ESP Code and UR Z10 govern specific bulk-carrier/tanker categories; for other ships UTM extent, diminution limits and acceptance criteria follow applicable class Rules.
Regulatory Reference
2011 ESP Code A.1049(27) and relevant Z10 part for SOLAS XI-1/2 ships; class hull-survey Rules for other ships.
Scope of Application
Ship type, survey number/age and specific table determine extent. Substantial corrosion is not a universal percentage transferable outside scope.
Procedure / How to Complete It
- Classify ESP/non-ESP and ship type.
- Select correct Code/Z10 table or class Rule.
- Use approved TM firm where required.
- Compare with approved diminution limits.
- Extend measurements only from findings/surveyor direction.
Practical Example
A general cargo ship does not automatically receive the Z10.2 bulk-carrier table; it uses its Society's Rules.
What Typically Goes Wrong
Applying Z10.1–Z10.5 to every ship or transferring substantial-corrosion definitions outside ship/survey scope.
Common Mistakes Mistake Library
| Mistake | Consequence | How to Avoid It |
|---|---|---|
| Applying Z10.1–Z10.5 to every ship or transferring substantial-corrosion definitions outside ship/survey scope. | Non-compliant decision or treatment | Follow the approved arrangement and applicable sources |
What the PSCO Checks
Operational Tips
- Separate current requirement, class/maker, SMS and voluntary guidance.
- Do not improvise tests, thresholds or intervals.
- Record deviations and corrective action.
Preparation checklist
- Ship type
- Applicable table
- Approved firm
- Diminution limits
- Surveyor extent
FAQ
Related Topics
Last substantive revision of this page: 31 August 2026 · page fingerprint 21d2a2f3bc94