UTM (Ultrasonic Thickness Measurement)

Poly NDT Pte Ltd was established in 1975 in Singapore to provide third party and independent testing and inspection service, such as NDT(Non-Destructive Testing) services, hazardous materials inspection services.

We are a member of CTI (Centre Testing International Co. Ltd). which is a international testing, inspection and certification group company.


  • POLY NDT Pte Ltd is accredited under 13 Ship Calcification Society
  • POLY NDT PTE LTD is accredited under ISO 9001:2008
  • POLY NDT PTE LTD is accredited under bizSAFE Enterprise Level 4
  • All qualified employees connected with NDT activities are highly
  • Qualified, Experienced and well trained with ASNT or PCN certification.

UTM is frequently used to monitor metal thickness in industrial settings. NDT Technicians equipped with portable UTM equipment and probes can access steel plating in sides, tanks, decks and the superstructure of ships. They can read the steel's thickness by simply touching it with the measurement head (transducer) of the UTM device.

To ensure effective contact, any visible corrosion scale is removed first and then petroleum jelly or similar substance is applied before pressing the probe against metal. These testing methods are used to inspect metal to determine quality and safety without destroying or compromising its integrity. It has now become a requirement of many Classification societies.

Classification Requirements for UTM Hull Surveys

Classification societies have detailed requirements for the thickness measurement of hull structures, which depend greatly on the vessel's type, age and length. The International Association of Classification Socities (IACS) has a set of guidelines which sets out such requirements for all its members. The allowable thresholds of thickness will depend upon the specific construction rules of each Classification society. Each society will also stipulate their own requirements for the number of operators required for UTM surveys.

The UTM operators need to be at least Level II certified according to the requirements of SNT-TC-1A (or similar standard). The company undertaking the UTM survey must be approved by the Classification society to which the vessel is registered.. The Classification society will review the documented procedures of the UTM survey provider as well as conducting an audit to to issue an approval certificate. All equipment used by the UTM survey provider needs to be approved by the appropriate Classification society.

Poly Ndt Company/personnel Qualification

GUIDELINES Mepc.197(62): 2011 Guidelines For The Development Of The Inventory Of Hazardous Materials
Mepc.196(62): 2011 Guidelines For The Development Of The Ship Recycling Plan
Mepc.210(63): 2012 Guidelines For Safe And Environmentally Sound Ship Recycling
Mepc.222(64): 2012 Guidelines For The Survey And Certification Of Ships Under The Hong Kong Convention
Mepc.223(64): 2012 Guidelines For The Inspection Of Ships Under The Hong Kong Convention
The Eu Ship Recycling Regulation

Cti Provide The Service

Approved by 12 Classification societies
1) American Bureau of Shipping
2 ) Det Norske Veritas
3) Nippon Kaiji Kyokai
4) Germanischer Lloyd
5) Korean Register of Shipping
6) Lloyd’s Register
7) Rina
8) Biro Klasifikasi Indonesia
9) Ships Classification Malaysia
10) Bureau Veritas
11) International Ship Classification
12) Indian Register of Shipping

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