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Nellai NDT Private Limited
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NDT Methods & Services

Complete non-destructive testing & inspection, under one roof

From conventional UT and radiography to advanced imaging, material analysis, thermography and third-party inspection — carried out by certified technicians to ASME, API and international acceptance standards.

UT · UTM
Conventional ultrasonic & thickness
PAUT · TOFD
Advanced phased-array imaging
IRIS · RFT
Tube & heat-exchanger inspection
RT · DR · CR
Radiography — film & digital
MT · PT · VT
Surface & visual methods
ECT · ACFM
Eddy current & ACFM
PMI · Ferrite
Material verification
Hardness
Portable hardness testing
MFL
Tank-floor scanning
Infrared
Thermography surveys
Leak Testing
Vacuum-box & leak
PWHT
Post-weld heat treatment
Third Party
Inspection & expediting
Ultrasonic TestingUT · Field inspection
UT · Ultrasonic Testing

Ultrasonic Testing

High-frequency sound waves detect internal and surface-breaking flaws and measure remaining wall thickness — the backbone of in-service and fabrication inspection for welds, plates, forgings and castings.

  • Conventional UTStraight & angle-beam flaw detection to code.
  • Thickness Gauging (UTM)Corrosion & erosion wall-loss monitoring.
  • Weld ExaminationVolumetric scanning of butt & fillet welds.
  • Bond / LaminationDe-bond and lamination detection in plate.
Advanced Ultrasonic TechniquesPAUT · TOFD · IRIS
Advanced Ultrasonics

Advanced Ultrasonic Techniques

Beyond conventional UT, our advanced ultrasonic methods deliver imaging, sizing and high-coverage screening for critical assets and demanding acceptance criteria.

  • Phased Array (PAUT)Electronic beam steering & imaging.
  • Time-of-Flight Diffraction (TOFD)Precise flaw sizing for critical welds.
  • IRISInternal rotary inspection of tubes.
  • Corrosion Mapping / AUTAutomated C-scan wall-loss mapping.
  • HIC & AUBTHydrogen damage & on-stream tube testing.
  • SRUT / LRUTShort- & long-range screening.
Sample techniques
PAUT
PAUT
TOFD
TOFD
IRIS
IRIS
Corrosion Map
Corrosion Map
Radiographic TestingRT · Volumetric imaging
RT · Radiographic Testing

Radiographic Testing

Radiography reveals internal weld and casting defects as a permanent image — from conventional film to fully digital detectors for faster results and lower dose.

  • Conventional (Film) RTX-ray & gamma film radiography.
  • Digital Radiography (DR)Instant digital imaging.
  • Computed Radiography (CR)Phosphor-plate digital workflow.
  • Panoramic / DWDISingle-wall & double-wall techniques.
Radiography techniques
Film RT
Film RT
Digital (DR)
Digital (DR)
Computed (CR)
Computed (CR)
Panoramic
Panoramic
Magnetic Particle, Penetrant & VisualMT · MPI · Fluorescent
Surface Methods

Magnetic Particle, Penetrant & Visual

Fast, reliable detection of surface and near-surface discontinuities on welds, machined parts and castings — using magnetic particle, liquid penetrant, visual and electromagnetic surface methods.

  • Magnetic Particle (MT / MPI)Yoke, wet & fluorescent methods.
  • Liquid Penetrant (PT / DPT)Visible & fluorescent dye.
  • Visual Testing (VT)Direct & remote visual to code.
  • ACFMAlternating current field measurement.
Eddy Current & ElectromagneticECT · Tube inspection
ECT · Eddy Current Testing

Eddy Current & Electromagnetic

Electromagnetic induction inspects heat-exchanger and condenser tubing and non-ferrous components for wall loss, pitting and cracking — without couplant or surface preparation.

  • Conventional ECTSurface & tube crack detection.
  • Remote Field (RFT)Ferromagnetic tube wall loss.
  • Near Field (NFT)Fin-fan & carbon-steel tubing.
  • IRIS cross-checkCorrelated tube integrity data.
Material, Hardness & CorrosionPMI · Ferrite · Hardness
Material & Corrosion Analysis

Material, Hardness & Corrosion

Confirm the metal is what the spec demands, and quantify its condition — alloy identification, ferrite content, in-situ hardness and storage-tank floor corrosion mapping.

  • PMI / OESAlloy grade & chemistry confirmation.
  • Ferrite TestingFerrite number in stainless welds.
  • Hardness (Leeb · UCI · Telebrinneller)Portable in-situ hardness.
  • MFL — Tank FloorStorage-tank bottom corrosion mapping.
Infrared, Leak Testing & PWHTIRT · Leak · PWHT
Specialised & Integrity

Infrared, Leak Testing & PWHT

Specialised techniques that protect plant integrity — thermal imaging, leak detection, remote visual access and controlled post-weld heat treatment with recorded profiles.

  • Infrared Thermography (IRT)Thermal survey of equipment & insulation.
  • Vacuum Box Leak TestingWeld & plate leak detection.
  • Video Scope / BorescopeRemote visual of bores & vessels.
  • Holiday / Spark TestingCoating & lining integrity.
  • PWHTLocalised heat treatment with recorded charts.
Third Party InspectionTPI · Independent witness
TPI · Third Party Inspection

Third Party Inspection

Independent, impartial inspection and expediting across fabrication and in-service assets — protecting quality, safety and compliance on your behalf.

  • Vendor / Witness InspectionStage & final inspection at source.
  • In-service InspectionPlant integrity & fitness-for-service.
  • Fabrication QA/QCWelding & NDT surveillance.
  • Level III ConsultancyProcedures & personnel certification.

Need an inspection, or a technique not listed here?

Tell us your requirement — we'll recommend the right method and mobilise quickly.