Established 1998 · UK & Europe Coverage

Non Destructive Testing (NDT)/ Examination

Non-Destructive Testing, Inspection & Lifting Services supporting Oil & Gas and Renewable Energy projects.

Non‑Destructive Testing Services That Protect Asset Integrity and Operational Uptime

OTI provides a comprehensive range of Non‑Destructive Testing (NDT) and Non‑Destructive Examination (NDE) services designed to help operators assess asset condition, manage risk, and maintain safe operations — without interrupting production or damaging components.

Our services support clients across oil & gas, energy, petrochemical, marine, fabrication, and renewables, delivering inspection data that can be relied on for compliance, integrity management, and maintenance planning.

All inspections are carried out by certified technicians in accordance with recognised international standards, including ASNT, ISO, API, and ASTM.

Inspection That Supports Decisions Not Just Compliance

NDT only adds value when the results are clear, accurate, and usable.

OTI’s inspection approach focuses on:

  • early identification of defects and degradation
  • clear assessment of severity and extent
  • inspection data that supports repair, re‑run, or continued service decisions

This allows asset owners and operators to manage integrity proactively rather than reacting to failures.

Visual, Optical, and Dimensional Inspection

Often the first stage of integrity assessment, visual and dimensional inspections provide rapid identification of surface‑level defects and fabrication issues.

OTI inspectors assess:

  • surface cracks, corrosion, dents, and deformation
  • weld profile issues such as undercut, misalignment, porosity, and spatter
  • dimensional compliance against drawings, codes, and specifications

Where required, remote visual inspection using borescopes and video probes allows access to confined or internal areas without dismantling equipment.

Magnetic Particle Inspection (MPI)

MPI is used to detect surface and near‑surface defects in ferromagnetic materials where cracking or fatigue is a concern.

OTI’s MPI services:

  • identify cracks, seams, and laps in welds, castings, and forgings
  • support wet or dry techniques, fluorescent or visible contrast
  • can be performed in‑shop or on‑site
  • provide fast, repeatable results for high‑volume components

This method is commonly used where early crack detection is critical to preventing failure.

Liquid Penetrant Inspection (LPI / DPI)

For non‑magnetic or non‑porous materials, LPI provides high sensitivity surface defect detection.

OTI applies LPI to:

  • stainless steel, aluminium, and other alloys
  • components where surface integrity is critical

This method highlights:

  • surface‑breaking cracks
  • pinholes and porosity
  • leaks and fabrication defects

All inspections are carried out in line with ASME and ASTM requirements.

Ultrasonic Testing (UT) and Flaw Detection

OTI’s ultrasonic inspection services identify internal and subsurface defects that are not visible externally.

Using digital flaw detectors and phased array systems, we detect:

  • laminations and inclusions
  • internal cracking
  • lack of fusion in welds

Results include accurate defect sizing and reporting, supporting integrity assessments and fitness‑for‑service decisions.

Ultrasonic Thickness Measurement

Thickness gauging allows material condition to be assessed without cutting or disassembly, making it essential for ongoing integrity monitoring.

OTI supports:

  • corrosion monitoring of pipelines, tanks, and pressure vessels
  • erosion measurement in high‑wear areas
  • early identification of wall thinning

Reports can include remaining wall life assessments and visual mapping to support maintenance planning.

Ultrasonic Bonding and Adhesion Checks

For bonded and composite structures, ultrasonic inspection verifies joint integrity and identifies hidden defects.

This method detects:

  • debonding
  • delamination
  • voids and poor adhesion

It is commonly used in composite structures, bimetallic interfaces, and pipeline sleeve applications where bond failure presents a significant risk.

Field Gradient and Thermal Inspection

Field gradient and thermal techniques are used for predictive and condition‑based maintenance, identifying abnormal behaviour before failure occurs.

These inspections can reveal:

  • stress concentrations
  • ferrous contamination
  • internal defects causing abnormal thermal patterns

Applications include rotating equipment, pipelines, transformers, and high‑voltage systems.

Hardness Testing

Hardness testing provides insight into material strength, wear resistance, and heat treatment condition.

OTI offers portable, on‑site testing using:

  • Brinell
  • Rockwell
  • Vickers
  • UCI methods

Results support:

  • weld verification
  • heat treatment confirmation
  • failure investigations
  • correlation with mechanical properties such as tensile strength

Delivered by Certified Technicians Who Understand Operational Environments

All NDT services are delivered by qualified, experienced personnel who understand the constraints of live operations, shutdowns, and project schedules.

For clients, this means:

  • inspections completed efficiently
  • results that stand up to scrutiny
  • clear reporting that supports confident decision‑making

If you’re responsible for asset integrity, inspection planning, or compliance and need NDT results you can rely on, OTI provides testing services designed to support safe operations and informed decisions.

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