Thickness Measurement Intervals (IACS UR Z10)
UR Z10 survey schedule for oil tankers (Z10.1) and bulk carriers (Z10.2) by age and survey cycle.
Applicable survey regime
Annual - selective + Intermediate Survey - full exterior
Formula, assumptions, and limits
UR Z10 is the reference every thickness-measurement firm works to. Special Survey at 5-year intervals; each SS adds more close-up + gauging scope. Post-20-year ships face extended inspection under CAS regime for tankers.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Special Survey | - | IACS Z10 | |
| Years since delivery | years | ship certificate |