Overview
What we map. Shell courses, roofs and nozzles, supporting API 653 style integrity programmes and insurance inspections. Erosion at bends and tees, corrosion under insulation entry points, and pressure system thinning. Beams, columns and connections in car parks, plants and marine structures, through coatings where present. Splash zone and submerged steel, with ROV-deployed UT below the waterline. Plate thickness surveys for condition assessment and class support. Section loss on ageing riveted and welded members, quantified for assessment engineers.
What we survey
Storage tanks
Shell courses, roofs and nozzles, supporting API 653 style integrity programmes and insurance inspections.
Pipework & vessels
Erosion at bends and tees, corrosion under insulation entry points, and pressure system thinning.
Structural steel
Beams, columns and connections in car parks, plants and marine structures, through coatings where present.
Sheet piling & gates
Splash zone and submerged steel, with ROV-deployed UT below the waterline.
Hulls
Plate thickness surveys for condition assessment and class support.
Bridges & gantries
Section loss on ageing riveted and welded members, quantified for assessment engineers.
Methods, matched to the job. Thickness work follows recognised ultrasonic practice (BS EN ISO 16809), with multiple-echo techniques used so coatings are excluded from the reading. Where access is the constraint, the probe goes to the steel by ROV or rope access rather than scaffolding.
From readings to decisions. The deliverable is not a pile of numbers. Minimum readings are flagged against nominal thickness and corrosion allowance, thinned zones are dimensioned and located on the structure, and repeat surveys convert the change into a corrosion rate. That is what an integrity engineer needs to defer a repair with confidence, or to stop deferring one. See also our thickness testing and corrosion mapping equipment.
Scan before you repair. That is the standing advice for every Corrosion Mapping client, and the reason NDTScan reports what the concrete contains before anyone specifies what to do about it.
Services Available Nationwide
- GPR Concrete Scanning Pre-drill and pre-coring surveys, rebar and mesh mapping, post-tensioned tendon detection, void detection, slab thickness and cover estimation and RAAC identification.
- Ultrasonic Testing of Concrete Ultrasonic pulse velocity, pulse echo and SONREB for uniformity, thickness, delamination and compressive strength estimation where GPR alone cannot answer the question.
- Concrete Compressive Strength Assessment Rebound hammer, UPV combined method and managed core extraction to BS EN 13791, with independent reporting for engineering acceptance and building control.
Related Services
Related: Thickness testing and corrosion mapping equipment; Underwater NDT inspection for steel below the waterline; Oil and gas NDT services for tanks, terminals and pressure systems; Ultrasonic testing of concrete and concrete and structural integrity; Emergency NDT response.
About NDTScan
NDTScan is a specialist non-destructive testing company based in Oxford and led by Neil Smuts. Its core disciplines are GPR concrete scanning, ultrasonic testing and in-situ compressive strength assessment, brought together in its concrete scanning and structural condition survey service. NDTScan is a Level 4 UKCSS Operator, the first in the UK to achieve that certification. Corrosion Mapping and the whole of the United Kingdom are within the company's everyday working area, and all work is reported to a standard suitable for engineering acceptance. RAAC identification is covered on the RAAC surveys page, and steel on the ultrasonic thickness and corrosion mapping page.
Corrosion Mapping NDT Services
- Storage tanks Shell courses, roofs and nozzles, supporting API 653 style integrity programmes and insurance inspections.
- Pipework and vessels Erosion at bends and tees, corrosion under insulation entry points, and pressure system thinning.
- Structural steel Beams, columns and connections in car parks, plants and marine structures, through coatings where present.
- Sheet piling and gates Splash zone and submerged steel, with ROV-deployed UT below the waterline.
- Hulls Plate thickness surveys for condition assessment and class support.
- Bridges and gantries Section loss on ageing riveted and welded members, quantified for assessment engineers.
Our Services
- Concrete & Structural Integrity
- Drone-Based Aerial Surveying
- Vehicle-Mounted Inspection
- Handheld & Portable Inspection
- Underwater Surveying & Inspection
- Digital Twin & 3D Modelling
- Advanced Data Analytics & Reporting
Sectors We Support
- Aerospace & Aviation
- Education & Public Sector
- Archaeology & Heritage
- Smart Cities & Urban Planning
- Waste & Recycling
- Defence & Security
- Emergency Response
- Construction & Real Estate
- Mining & Minerals
- Agriculture & Environment
- Maritime & Underwater
- Rail & Transportation
- Oil & Gas
- Civil Engineering
- Utilities & Energy
Equipment & Technologies
- IML
- GSSI
- Sylva
- Leica
- Voyis
- Testo
- Hilti
- Cygnus
- Proceq
- MALA GPR
- SlipAlert
- Flyability
- Protimeter
- Matterport
- Saab Seaeye
- Deep Trekker
- IDS GeoRadar
- FLIR Systems
- Sonatest Ltd
- Wagner Meters
- Mistras Group
- Munro Stanley
- Blue Robotics
- DJI Enterprise
- Teledyne Marine
- Quantum Systems
- Argus Electronic
- Fakopp Enterprise
- Eddyfi Technologies
- Olympus Corporation
- FARO
- NavVis
- Trimble
Why Choose NDTScan
Corrosion Mapping NDT FAQs
Frequently Asked Questions.
Common questions about ultrasonic thickness testing & corrosion mapping from NDTScan, answered by the team that does the work.
What is corrosion mapping?
Corrosion mapping is a grid of ultrasonic thickness measurements across a surface, presented as a colour-coded map. Instead of a handful of spot readings, you see the full thickness profile of the plate, shell or wall, including isolated pitting that spot checks miss.
What is the difference between spot UT and corrosion mapping?
Spot UT gives single thickness values at chosen points. Mapping covers an area on a defined grid, so localised pitting, erosion patterns and corrosion under coatings show up as shapes on a map rather than depending on whether a spot happened to land on them.
Can you measure thickness through coatings?
Yes, with multiple-echo techniques the coating is excluded from the reading, so painted or coated steel can be surveyed without removing the protection.
What do the results look like?
A colour-mapped grid of thickness values referenced to the structure, minimum readings flagged against design and corrosion allowance, and a written assessment. Repeat surveys give corrosion rates and support remaining-life decisions.
Can corrosion mapping be done underwater?
Yes. UT payloads on our ROVs take thickness readings on submerged steel such as sheet piles, lock gates and hulls, so the same quantified approach extends below the waterline.