Comprehensive Maritime Inspection & NDT Services
NDTest offers a complete range of inspection and non-destructive testing services for ship structures, hull assessments, and technical reporting. All services comply with classification society requirements and international marine standards.
Ultrasonic Thickness Measurements (UTM)
Precise hull structure thickness measurements according to classification society requirements.
Rope Access Close-Up Inspections
Access hard-to-reach areas safely without scaffolding using IRATA-certified techniques.
Remote Inspection Techniques (RIT)
Non-destructive inspection in confined and hard-to-reach areas using advanced techniques.
Technical Reporting
Comprehensive reports with thickness tables, corrosion analysis, repair estimates, and detailed documentation accepted by major classification societies.
Certified & Approved By:
Ultrasonic Thickness Measurements (UTM)
Precise measurement of hull steel thickness to detect corrosion, wear, and define steel renewal scope according to classification society requirements.
What is Ultrasonic Thickness Measurement?
Ultrasonic Thickness Measurement (UTM) is a non-destructive testing method that uses high-frequency sound waves to precisely measure the thickness of ship hull steel and structural components. An ultrasonic probe is placed against the steel surface, and the instrument calculates thickness based on the time it takes for the sound wave to travel through the material and return.
This fast, accurate, and non-invasive technique allows inspectors to assess the condition of vessel structures without cutting into the steel or requiring extended vessel downtime. UTM measurements are performed at multiple locations across the hull to create a comprehensive profile of steel condition and corrosion patterns.
Why UTM Matters to Shipowners
Define Steel Renewal Scope
UTM measurements precisely identify which sections of the hull require steel renewal, allowing you to prepare accurate repair scope and budgets before entering dry dock.
Avoid Unexpected Findings
Pre-dock UTM surveys eliminate surprises during docking. You know exactly what repairs are needed before the shipyard starts work, preventing costly scope creep and delays.
Support Class Survey Compliance
UTM reports prepared by NDTest meet DNV CP-0620, RINA, and ClassNK requirements for class surveys (CLASS, CAP, ESP). Reports are accepted directly by classification societies.
Negotiate with Confidence
Independent UTM data gives you objective documentation to support negotiations with shipyards. You can justify repair scopes and budgets with technical evidence, not estimates.
How UTM Works
Non-Destructive Probe Application
A certified NDT technician applies an ultrasonic probe to the steel surface. The probe transmits sound waves into the material without damaging the surface or requiring paint removal.
Sound Wave Transmission
High-frequency sound waves travel through the steel to the opposite surface, then reflect back to the probe. The instrument measures the time delay to calculate precise thickness.
Fast, Systematic Measurement
Measurements are taken at multiple locations across critical hull areas—cargo holds, ballast tanks, tank tops, and structural compartments. The process is fast, allowing comprehensive coverage without extended downtime.
Data Analysis & Reporting
All measurements are recorded and analyzed to identify corrosion patterns, remaining service life, and steel renewal scope. Results are compiled into a comprehensive technical report.
Class Society Compliance & Certification
NDTest's UTM services are certified and approved by major classification societies. Our reports meet all applicable standards for class surveys and ship inspections:
DNV CP-0620
Ultrasonic thickness measurement certification for DNV class surveys. Our reports fully comply with DNV standards for hull condition assessment.
RINA Certification
RINA-approved UTM and Remote Inspection Techniques for ships and mobile offshore units. Full compliance with RINA classification requirements.
ClassNK Approval
ClassNK-approved ultrasonic thickness measurement and RIT for class compliance. Reports accepted for ClassNK surveys and inspections.
All reports are prepared to meet CLASS, CAP, and ESP survey requirements, ensuring seamless integration with your classification society compliance program.
What You Receive
NDTest UTM surveys deliver comprehensive technical documentation that supports planning, budgeting, and class compliance:
Thickness Measurement Tables
Detailed tabulated data organized by compartment, location, and measurement point. Easy to reference for repair scope definition and class compliance documentation.
Corrosion Analysis
Professional assessment of corrosion patterns, wear rates, and remaining service life for each structural section. Identifies high-risk areas requiring priority repair.
Steel Renewal Scope Estimation
Quantified repair scope with weight calculations for steel renewal. Provides accurate basis for shipyard quotes and budget planning.
Structural Sketches & Diagrams
Visual representation of affected areas, repair locations, and structural details. Helps shipyards understand scope and plan repair execution.
Photo Documentation
High-quality photographs of inspected areas, corrosion patterns, and identified defects. Provides visual reference for class surveys and shipyard discussions.
UTM Applications
Pre-Dock Steel Condition Surveys
Comprehensive UTM inspection before dry docking to define renewal scope, avoid surprises, and prepare accurate budgets for shipyard negotiations.
Class Survey Support (CLASS, CAP, ESP)
UTM reports prepared to DNV, RINA, and ClassNK standards to support class survey compliance and condition assessment requirements.
Condition Assessment During Docking
Real-time UTM measurements during dry docking to assess newly exposed steel areas and support repair scope refinement.
Steel Renewal Planning & Budgeting
Detailed UTM data enables accurate repair scope definition, weight calculations, and budget planning for multi-year vessel maintenance programs.
Why Choose NDTest for UTM Services
- DNV, RINA, ClassNK Certified — All reports meet classification society standards and are accepted for class compliance.
- Experienced Marine Inspectors — Our team has practical maritime experience and deep knowledge of ship structures and steel renewal requirements.
- Comprehensive Documentation — Detailed reports with thickness tables, corrosion analysis, repair estimates, sketches, and photos support confident decision-making.
- Fast Mobilization — We can mobilize quickly worldwide to support your inspection schedule and docking timeline.
- Independent Third-Party Assessment — Our reports provide objective documentation for class compliance and shipyard negotiations, free from conflicts of interest.
Rope Access Close-Up Inspections
IRATA-certified technicians access hard-to-reach areas safely and efficiently without expensive scaffolding. Our rope access expertise enables detailed structural assessment in confined spaces, cargo holds, and elevated structures.
What is Rope Access Inspection?
Rope access is a specialized technique using certified technicians and safety equipment to access difficult-to-reach areas on ships and structures. Our team holds IRATA (International Rope Access Trade Association) certification, ensuring the highest safety and professional standards.
Rather than requiring expensive scaffolding or vessel immobilization, rope access enables rapid, safe inspection of:
- Vertical hull structures and overhangs
- Confined spaces and cargo holds
- Under-deck areas and ballast tanks
- Mast areas and rigging structures
Key Benefits
Faster Mobilization
No scaffolding setup required—rapid deployment and inspection
Enhanced Safety
IRATA-certified professionals using proven safety protocols
Reduced Docking Time
Complete inspections without extended vessel immobilization
Cost-Effective
Eliminates expensive scaffolding and equipment rental costs
Areas We Access & Inspect
Cargo Holds & Hatch Covers
Confined spaces requiring detailed visual assessment, thickness measurement, and corrosion evaluation. Rope access enables safe, thorough inspection without vessel entry restrictions.
Ballast Tanks & Void Spaces
High-risk structural areas prone to corrosion. Rope access allows detailed inspection of tank tops, internal structures, and coating condition in confined spaces.
Under-Deck Spaces
Structural decking and support members in confined areas. Rope access enables close-up inspection and thickness measurement where conventional access is difficult.
Hull Overhangs & Underwater Sections
Stern areas, propeller surrounds, and hull sections below waterline (in dry dock). Rope access provides safe access without scaffolding or diving operations.
Mast Areas & Rigging
High structures, mast attachments, and rigging components. Rope access technicians safely inspect elevated structures and assess structural integrity.
Tank Tops & Double Bottoms
Internal ship structures accessed via confined spaces. Rope access enables detailed visual and thickness assessment for structural condition evaluation.
Inspection Methods
Visual Testing (VT)
Detailed close-up visual assessment of structural surfaces, welds, coatings, and defects in confined areas.
High-Quality Photography
Professional photo documentation of inspected areas, identified defects, and structural conditions for detailed reporting.
Ultrasonic Thickness Measurement (UTM)
Precise steel thickness measurement in accessible areas to assess corrosion and wear rates.
Remote Inspection Techniques (RIT)
Advanced inspection methods (UT, MT, ET, PT) deployed in confined spaces where conventional access is impossible.
Structural Assessment
Professional evaluation of structural condition, repair requirements, and safety implications.
Deliverables
Detailed Photo Reports
High-quality annotated photographs documenting all inspected areas, identified defects, and structural conditions.
Condition Assessment Report
Professional written assessment of structural condition, wear patterns, and remaining service life evaluation.
Repair Scope Estimation
Quantified repair scope with weight calculations and material specifications for shipyard planning and budgeting.
Structural Sketches & Diagrams
Visual diagrams and technical sketches showing affected areas, repair locations, and repair recommendations.
Professional Recommendations
Expert recommendations for repairs, maintenance priorities, and structural safety considerations.
IRATA Certification & Safety Standards
All NDTest rope access technicians hold IRATA (International Rope Access Trade Association) certification, the globally recognized standard for rope access work. Our team maintains rigorous safety protocols, regular training, and equipment inspections to ensure the highest professional standards.
IRATA certification ensures that rope access inspections are performed safely, professionally, and in compliance with international maritime industry standards and classification society requirements.
Why Choose NDTest for Rope Access Inspections?
IRATA-Certified Expertise
Certified rope access technicians with practical maritime inspection experience and proven safety records.
Rapid Mobilization
Fast deployment without extended vessel preparation or scaffolding setup—critical for tight docking schedules.
Safety-First Approach
Comprehensive safety protocols, regular equipment inspections, and professional hazard management throughout every inspection.
Professional Documentation
Detailed photo reports, condition assessments, and structural sketches accepted by classification societies.
Worldwide Availability
Based in Tallinn, Estonia with rapid mobilization capability to ports and shipyards worldwide.
Integrated Services
Rope access combined with UTM, RIT, and comprehensive NDT methods for complete structural assessment.
Pre-Dock Steel Condition Surveys
Know your vessel's true steel condition before entering dry dock. Avoid unexpected repairs, delays, and budget overruns with NDTest's comprehensive pre-dock assessment.
The Challenge
Many shipowners enter dry dock without understanding their vessel's true steel condition. This uncertainty leads to:
- • Unexpected steel renewal scope during docking
- • Project delays and extended docking time
- • Increased repair costs and budget overruns
- • Difficult negotiations with shipyard repair teams
NDTest's Solution
Comprehensive pre-dock surveys that give you complete visibility into your vessel's steel condition before entering dry dock:
- ✓ Define renewal scope with confidence
- ✓ Prepare accurate repair budgets
- ✓ Eliminate unexpected findings during docking
- ✓ Negotiate with shipyards using independent data
What's Included in a Pre-Dock Survey
Ultrasonic Thickness Measurements (UTM)
Precise measurement of hull steel thickness in critical areas to identify corrosion and wear patterns.
Close-Up Visual Inspections
Detailed assessment of suspect areas, compartments, and structural elements using professional visual testing techniques.
Rope Access Assessment
IRATA-certified technicians access hard-to-reach compartments (cargo holds, ballast tanks, under-deck spaces) safely without scaffolding.
Photo Documentation
High-quality photographic records of all inspected areas, defects, and structural conditions for permanent documentation.
Corrosion Analysis
Professional assessment of corrosion patterns, wear rates, and remaining service life of structural elements.
Repair Recommendations
Detailed structural sketches, diagrams, and specifications for all identified repairs and steel renewal work.
The Pre-Dock Survey Process
Initial Consultation
We discuss your vessel, inspection scope, timeline, and budget requirements. Define critical areas and survey objectives.
Survey Planning & Coordination
Coordinate with ship management, finalize inspection scope, schedule survey dates, and prepare technical requirements.
On-Deck Inspection & Data Collection
Our team performs UTM measurements, close-up visual assessments, rope access inspections, and comprehensive photo documentation of all areas.
Data Analysis & Assessment
Analyze all collected data, perform corrosion assessment, calculate steel renewal scope, and estimate repair costs and weights.
Comprehensive Report Preparation
Prepare detailed technical report including thickness tables, corrosion analysis, structural sketches, repair recommendations, and high-quality photo documentation.
Report Delivery & Discussion
Deliver comprehensive report and discuss findings with ship management. Answer technical questions and provide guidance for dry dock planning.
Why Pre-Dock Surveys Matter
Accurate Planning
Know exactly what repairs are needed before entering dry dock. No surprises, no scope creep.
Budget Control
Prepare accurate repair budgets and negotiate with confidence based on independent inspection data.
Faster Docking
Reduce docking delays by having a clear repair scope and repair strategy defined before arrival at the yard.
Class Compliance
Reports meet DNV, RINA, and ClassNK requirements and are accepted for class survey compliance.
Typical Survey Scope
Areas Typically Inspected
- Hull side shell plating (all accessible areas)
- Deck structures and hatch coamings
- Cargo hold boundaries and tank tops
- Ballast tank structures (internal surfaces)
- Engine room structural elements
- Accommodation area bulkheads (where required)
Report Deliverables
- Executive summary of findings
- Detailed thickness measurement tables
- Corrosion analysis and assessment
- Steel renewal scope with weight calculations
- Structural sketches and repair diagrams
- Comprehensive photo documentation
Class Society Compliance
NDTest pre-dock surveys are conducted according to classification society requirements and standards. Our reports are accepted by:
All surveys comply with DNV-CP-0620, RINA rules, and ClassNK requirements for ultrasonic thickness measurements and technical reporting standards.
Ready to Understand Your Vessel's True Condition?
Schedule a pre-dock steel condition survey before your next dry docking. Contact NDTest today for a consultation.