Conventional NDT Services

Comprehensive, Proven Inspection Methods

We deliver reliable conventional nondestructive testing (NDT) services that provide critical data for assessing structural integrity, ensuring compliance, and supporting safe, efficient operations.

From ultrasonic thickness testing and radiography to magnetic particle, liquid penetrant, and eddy current methods, our team applies proven inspection techniques across a wide range of assets and industries. These services form the foundation of effective asset integrity programs—delivering accurate results without disrupting operations.

Conventional Nondestructive Testing (NDT) remains a critical tool for gathering data, assessing structural integrity, ensuring compliance, and verifying engineering designs—without compromising asset functionality. XCEL delivers accurate, reliable conventional NDT services across a wide range of industries and applications.

Ultrasonic Thickness Testing (UTT)

Ultrasonic Thickness Testing (UTT) provides precise measurements of material thickness, helping determine the condition and remaining life of piping, tanks, and vessels. Using high-frequency sound energy, this method delivers highly accurate results in a variety of environments.

Key Advantages:

Requires access to only one side of the test surface
Highly accurate measurements when performed by qualified technicians
No inherent hazards associated with the method

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Visual Testing (VT)

Visual Testing (VT) is the foundation of nondestructive testing, encompassing direct, remote, and translucent inspection methods to identify surface and structural anomalies. Using tools such as video probes, camera crawlers, and drones, XCEL’s certified professionals perform detailed inspections to detect corrosion, damage, and other signs of integrity loss across critical assets.

Direct visual examination remains one of the most effective and cost-efficient inspection methods when applied correctly, while remote visual technologies enable access to confined or otherwise inaccessible areas. Translucent viewing techniques are also used to evaluate non-metallic materials such as fiber reinforced plastic (FRP) tanks and piping.XCEL’s inspection team includes AWS-Certified Welding Inspectors (CWI), Senior CWI, VT Level II, and ASNT VT Level III professionals, ensuring qualified evaluation across a wide range of applications.

VT Applications Include:

AWS-CWI/SCWI – Welder qualification and weld inspection
Mechanical Measurement – Evaluation of surface conditions and dimensions using precision instruments
Condition Assessment – Detection of corrosion, distortion, damage, and other integrity concerns
Remote Visual Inspection – Examination of inaccessible areas using video probes, zoom cameras, crawlers, and drones
Translucent Viewing – Inspection of FRP and other non-metallic materials

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Radiographic Testing (RT)

Radiographic Testing (RT) uses ionizing radiation—X-rays or gamma rays—to inspect welds, castings, and pressure vessels. This method is highly effective for detecting subsurface defects, corrosion, and structural discontinuities, while also creating a permanent record for evaluation and documentation.

RT has long been a trusted method for determining weld integrity across pipelines, piping systems, tanks, and structural components. The selection of radiation source depends on material type, thickness, safety considerations, and inspection requirements.

Applications:

Examination of welds, castings, forgings, and composites
Corrosion detection and wall thickness measurement (profile radiography)

Advantages:

Applicable across a wide range of material types
Sensitive to changes in thickness from corrosion, erosion, voids, and density variations
Detects both surface and subsurface defects
Creates a permanent record of inspection

Limitations:

Requires strict safety precautions due to radiation use
Access to both sides of the test specimen is required
Orientation of the test piece and flaw positioning are critical
Multiple steps required to produce a final, interpretable radiograph

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Magnetic Particle Testing (MT)

Magnetic Particle Testing (MT) is a fast, cost-effective method for detecting surface and near-surface flaws in ferromagnetic materials. Commonly used on welds, pipelines, and pressure vessels, MT helps identify critical discontinuities such as cracks, seams, and laps across industries like refining and power generation.

This method works by inducing a magnetic field into the test object. Discontinuities disrupt the magnetic field, creating leakage fields that attract magnetic particles and form visible indications on the surface. MT can be performed using dry particles or wet suspension techniques, depending on the application and inspection requirements.

Magnetic Particle Methods:

Dry Powder – Iron oxide particles coated with dye for contrast on clean, dry surfaces
Black on White – Black particles applied over a white contrast background to enhance visibility
Fluorescent – Fluorescent particles used under UV light to increase sensitivity and detectability

Advantages:

Quick inspection with minimal surface preparation compared to PT
Detects surface and near-surface flaws
Produces visible indications directly on the surface
Portable with relatively low equipment cost

Limitations:

Limited to ferromagnetic materials such as carbon steel
Detects only surface and near-surface discontinuities
Proper alignment of magnetic field and flaw is critical

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Ultrasonic Testing (UT)

Ultrasonic Testing (UT) remains a cornerstone of NDT and inspection services, providing reliable flaw detection across a wide range of materials and components. Using proven techniques prescribed by industry codes and standards—including ASME—UT delivers accurate evaluation of material integrity without compromising asset functionality.

Prior to advanced methods like PAUT and TOFD, ultrasonic testing relied on traditional variables such as contact or immersion techniques, pulse-echo or through-transmission methods, and straight beam or angle beam applications. These techniques are still widely used and tailored to meet specific inspection requirements based on material, flaw orientation, and applicable standards.

Techniques:

Angle Beam Examinations – Commonly used for welds, tubular products, and forgings in accordance with industry standards
Straight Beam Examinations – Ideal for detecting laminations in plates and inspecting castings, forgings, and shafts

Capabilities:

Detection of internal flaws based on material configuration and flaw orientation
Techniques tailored to meet code, standard, and specification requirements
Support for compliance with industry standards, including ASME
Application across piping, vessels, and structural components

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Leak Testing (LT)

Leak Testing (LT) verifies the integrity of pressure boundaries in tanks, valves, and other pressure-retaining equipment, helping ensure safety, reliability, and compliance with industry standards. XCEL applies a range of proven techniques to detect leaks and confirm system integrity across critical assets.

Methods:

Bubble Leak Testing (BLT) – Vacuum box testing for tank floor welds
Direct Pressure Bubble Testing – Inspection of valves, re-pads, and pressure-retaining components
Pressure Change Testing – Monitoring pressure over time to identify leaks
Selection of appropriate methods based on application, sensitivity, and system requirements

Capabilities:

Detection of leaks in pressure-retaining systems and components
Support for compliance with industry codes and standards
Advanced methods available for increased sensitivity
ASNT Level III certified Leak Testing personnel

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Liquid Penetrant Testing (PT)

Liquid Penetrant Testing (PT) is a fast, reliable method for detecting surface-breaking discontinuities across a wide range of materials, including metals, ceramics, and composites. Commonly used in mechanical integrity inspections and pipe field services, PT provides clear visual indications of defects such as cracks, porosity, and lack of fusion.

The process relies on capillary action, where liquid penetrant is drawn into surface defects and then revealed using a developer. Proper surface preparation, application, and inspection techniques are critical to ensuring accurate and reliable results.

Basic Steps:

Precleaning – Removal of dirt, oil, paint, and contaminants to ensure proper penetrant coverage
Penetrant Application – Even application of visible or fluorescent penetrant with proper dwell time
Excess Penetrant Removal – Removal using water wash or solvent, depending on penetrant type
Developer Application – Application of developer to draw penetrant from discontinuities
Inspection – Visual or UV light examination to identify indications
Post Cleaning – Cleaning of the surface as required for service conditions

Advantages: