Ultrasonic thickness measurement
Corrosion stays invisible until it is measured. We gauge plating and stiffeners to a plan laid out on your drawings and report every reading against the original thickness and the diminution class allows.
- Surveys
- Renewal · intermediate · condition
- Probe
- Dual-element, calibrated
- Report
- By member, location and % diminution
- ADual-element probe
- BGauging grid
- CPitting · 9.6 mm left
What we do
01 / 05- 01Gauging plans on the ship's drawings
- 02Plating, stiffeners, frames and brackets
- 03Transverse sections and close-up survey areas
- 04Readings through coatings where the instrument allows
- 05Pitting and grooving assessment
- 06Steel renewal estimates from the readings
Side shell plating between frames — read on a grid and compared with the original scantlings.
How we work
02 / 05- 01
Plan
Members and sections to gauge, set out from the survey requirements and the ship's drawings.
- 02
Prepare
Access, each spot cleaned, couplant applied; the gauge calibrated on a reference block.
- 03
Measure
Readings taken and logged by member and location, with a second reading wherever a value is low.
- 04
Report
Readings against original thickness and allowable diminution, with the members to renew highlighted.
What you receive
03 / 05- IACS UR Z10 — hull surveys of ESP ships
- IACS UR Z17 — service suppliers
- Class society rules for thickness measurement
Questions
04 / 05Q.01Who can take thickness measurements for a class survey?
A firm approved by the classification society for that survey, working with the surveyor present or with the measurements verified by the surveyor.
Q.02How many readings does a survey need?
It depends on the survey, the ship's type and age and the condition found. The class rules give the minimum; suspect areas add more.
Q.03What is allowable diminution?
The share of its original thickness a member may lose before it must be renewed. Each class society sets it per member and per ship type.
Request a repair.
Tell us the ship, the port and the job. We reply with questions, a plan or a quote.