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Home › Dry Dock › Thickness Measurement (Ultrasonic Thickness Measurement, UTM)
Operational guide · Certification & surveys

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.

thickness measurementUTMcorrosionspecial survey

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.

PR19 provides for a planning meeting before measurements involving the surveyor, ship’s representative and thickness-measurement firm. Agree access, preparation, criteria and communication of results; final measurement extent and locations also depend on the overall survey of representative spaces. IACS PR19.

Make each reading traceable to its location and structural member, with reference to applicable thicknesses and limits. Promptly report results that may require further measurements or repairs; do not merely deliver an aggregated report at the end of docking. Measurements support the surveyor’s decision rather than replace it. IACS PR19: monitoring and reporting.

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

  1. Classify ESP/non-ESP and ship type.
  2. Select correct Code/Z10 table or class Rule.
  3. Use approved TM firm where required.
  4. Compare with approved diminution limits.
  5. 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

MistakeConsequenceHow to Avoid It
Applying Z10.1–Z10.5 to every ship or transferring substantial-corrosion definitions outside ship/survey scope.Non-compliant decision or treatmentFollow the approved arrangement and applicable sources

What the PSCO Checks

Check UTM reports, area traceability, survey outcomes and repairs or conditions still open. An available report does not establish that every required area was measured or that the hull was accepted.

Operational Tips

Preparation checklist

FAQ

Does Z10 cover every ship?
No.
Is substantial corrosion universal?
No; it follows the applicable regime.

Related Topics

Coating and PSPCSurvey in Dry Dock

Last substantive revision of this page: 15 September 2026 · page fingerprint 6a164dcb5a52