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Ship Management
Oil tankers chartering
Technical Management
Ferrying of Vessels
Ship repair and modernization
Sale and Purchase of Vessels
Survey Services
Thickness measurements
Diesel Diagnosis (DDS)

Ultrasonic thickness measurements of vessel hull constructions

In accordance with Class rules all vessels undergo periodical surveys of hull constructions (annual, intermediate, special) with the purpose of ascertainment of technical condition of hull. The survey includes the damage detection of amount of wear, deformation and other defects of hull constructions. Upon comparison of results and class requirements the conclusion if the repairs are required is made.

Our specialists carry out the defect detection of hull constructions, thickness measurements and develop repairs recommendations.

Our company is certified by the Russian Maritime Register of Shipping, Bureau Veritas, Lloyd’s Register and Russian River Register and issued with the recognition certificate.

Our staff is qualified in accordance with international standards for the measurement on board during passage and in ports.

The measurements of residual thicknesses are performed using the ultrasonic method. The method is based on the electro-magnetic acoustic emittance and receipt of ultrasonic waves. Calculation of time and speed of passage of ultrasonic signals through the material allows the precise ascertainment of thickness of the object without damaging the object itself.

The measurements are taken using ultrasonic equipment manufactured by the UK-based «Cygnus Instruments Ltd», duly certified by the government. The principle of operation of the equipment involves the measurement of time interval between the two consecutive echo signals reflected from the inside surface of the material. The interface signal shows the thickness of the coating therefore the displayed result shows the thickness of the material without the coating. The method allows the measurement of thickness without removal of the paint from the surface of the material.

The measurement and defect detection during the pre-repair period allows evaluation of the volume of steel to be replaced thus saving repair time and customer’s money.

Our services:

  • Defect detection and ultrasonic measurement of residual thicknesses of vessel’s hull constructions;
  • Measurement of residual thicknesses of pipe, pressurized vessels, boilers, steam manifolds, calibration of anchor cables;
  • Issuance of required technical documentation in accordance with requirements of Lloyd’s Register, Germanisсher Lloyd, Det Norske Veritas, Bureau Veritas, Russian Maritime Register of Shipping, Nippon Kaiji Kyokai, Registro Italiano Navale;
  • Evaluation of technical condition of hull constructions (visual inspection, thickness measurement, photographs), issuance of preliminary report on board during passage, calculation of volume of steel to be replaced, professional assistance in creation of repair sheets, selection of repair company and order placement, supervision of repairs in accordance with defect detection;
  • Residual thickness measurements with the following calculation of hull strength and possible change of trading area;
  • Calculation of volume of required repairs of hull plating and constructions based on the performed defect detection;
  • Evaluation of technical condition of hull during renovation to 1SS or 2SS;
  • Survey of hull of the vessel during her sale / purchase.

Stages of operation:

  • Conduct of the meeting between the Class Society surveyor, thickness measurement specialist and ship owner’s representative in order to coordinate all operation and ensure security.
  • Visual inspection of hull elements, defect detection and measurement areas.
  • thickness measurements, evaluation of extent of deformations and other hull constructions defects.
  • Comparison of extent of defects and the corresponding values of the class society regulations, issuance of repair recommendations.
  • Issuance of the formal report and coordination of approval by the class society surveyor.