API-certified inspection standards and certified personnel programmes ensuring compliance, safety, and integrity across all critical industrial assets.
Certified Inspectors Inspection
Ensuring structural integrity & regulatory compliance
Certified Inspection Personnel
We provide highly qualified and certified inspection personnel across a broad range of disciplines, ensuring your operations meet rigorous global quality and safety standards. Our experts hold top-tier industry certifications and have extensive experience in both conventional and advanced NDT methods.
Scope / Focus
- API Inspectors for Visual Testing (VT): API 510, API 570, API 579, API 580, API 653, and API 936.
- American Welding Society (AWS): Certified Weld Inspector (CWI).
- ASME Boiler & Pressure Vessel Codes compliance.
- SNT – TC – 1A & CP189 compliant.
Key Objectives & Process
- ASNT Level 3 Experts: UT, RT, PT, MT, ET, VT, IR, LT, and Acoustic Emission Testing (AE).
- NACE Certified Coating Inspectors: Providing CIP Level 1, CIP Level 2, and CIP Level 3 personnel.
- Guaranteeing compliance with statutory, regulatory, and mechanical integrity requirements.
ASNT Level 3 Inspectors
Niger Delta Engineering Limited provides ASNT Level 3 qualified personnel — the highest certification tier defined by the American Society for Nondestructive Testing (ASNT) under SNT-TC-1A and CP-189 standards. Our Level 3 experts are authorised to establish and approve NDT procedures, interpret codes and standards, designate the NDT methods to be used, and certify Level 1 and Level 2 personnel. We deploy these elite specialists across the full spectrum of NDT disciplines to guarantee the most rigorous quality assurance for your assets.
Scope / Focus
- Personnel certified and compliant with ASNT SNT-TC-1A and CP-189 qualification and certification guidelines.
- Authorised to develop, qualify, and approve written NDT procedures and techniques.
- Responsible for interpreting applicable codes, standards, and specifications for NDT programmes.
- Empowered to certify Level 1 and Level 2 NDT technicians within their area of expertise.
Key Objectives & Process
- Ultrasonic Testing (UT): Detection of internal flaws, wall-thickness measurement, and weld evaluation.
- Radiographic Testing (RT): Film and digital radiography for volumetric inspection of welds and castings.
- Liquid Penetrant Testing (PT): Surface-breaking defect detection on non-porous materials.
- Magnetic Particle Testing (MT): Detection of surface and near-surface discontinuities in ferromagnetic materials.
- Electromagnetic Testing (ET): Eddy-current inspection for conductivity, thickness, and crack detection.
- Visual Testing (VT): Systematic direct and remote visual examination of components.
- Infrared / Thermal Testing (IR): Thermographic surveys for heat anomalies and insulation defects.
- Leak Testing (LT): Detection of leaks in pressure-containing systems.
- Acoustic Emission Testing (AE): Real-time monitoring of crack growth and structural changes under load.
ASNT Level 3 Inspection
Ensuring structural integrity & regulatory compliance
AWS CWI Inspection
Ensuring structural integrity & regulatory compliance
American Welding Society (AWS): Certified Weld Inspector
We provide American Welding Society (AWS) Certified Weld Inspectors (CWI) — one of the most widely recognised welding quality credentials in the world. Our CWIs are trained to evaluate weld quality, verify compliance with welding procedures and codes, and ensure that all welded fabrications meet the exacting safety and structural integrity standards required by the oil & gas, petrochemical, and structural engineering sectors.
Scope / Focus
- Inspection of welds against AWS D1.1 (Structural Welding Code — Steel), D1.6 (Stainless Steel), ASME Section IX, and other applicable codes.
- Review and approval of Welding Procedure Specifications (WPS) and Procedure Qualification Records (PQR).
- Verification of Welder Performance Qualifications (WPQ) to ensure welders are certified for the work scope.
- Pre-weld, in-process, and post-weld visual and dimensional inspections on all weld joint configurations.
Key Objectives & Process
- Verify that base metals, filler metals, and consumables conform to applicable material specifications.
- Confirm that welding parameters (amperage, voltage, travel speed, preheat, and interpass temperature) are within qualified ranges.
- Identify and document weld discontinuities including porosity, undercut, incomplete fusion, overlap, and cracks.
- Coordinate supplementary NDT methods (RT, UT, MT, PT) to ensure complete weld integrity assurance.
- Prepare detailed inspection reports and non-conformance reports (NCRs) to support quality management systems.
National Association of Corrosion Engineers (NACE)
Niger Delta Engineering Limited provides NACE International (now merged with SSPC as AMPP) Certified Coating Inspectors at all three CIP (Coating Inspector Program) levels. Corrosion is the single greatest threat to asset integrity in the oil & gas and marine industries. Our NACE-certified specialists ensure that protective coatings and linings are correctly applied and maintained, dramatically extending asset service life and preventing costly corrosion-related failures.
Scope / Focus
- Inspection of surface preparation standards (Sa 2.5, SSPC-SP 6, NACE No. 3, etc.) prior to coating application.
- Monitoring and verification of coating application conditions — ambient temperature, dew point, relative humidity, and substrate temperature.
- Dry Film Thickness (DFT) measurement using calibrated gauges to verify coating meets specified thickness requirements.
- Holiday (pinhole) detection testing using low- and high-voltage detectors to identify coating voids.
- Coating adhesion testing (pull-off and cross-cut methods) to verify bond strength to substrate.
Key Objectives & Process
- CIP Level 1 — Coating Inspector: Performs routine coating inspections under the supervision of a senior inspector, documenting surface preparation, environmental conditions, and application quality.
- CIP Level 2 — Senior Coating Inspector: Independently plans and executes comprehensive coating inspection programmes, prepares technical inspection reports, and resolves coating application deficiencies.
- CIP Level 3 — Coating Inspection Specialist: Provides expert consultation on coating system selection, specification development, failure analysis, and quality assurance programme management for large-scale projects.
- Ensure compliance with NACE, SSPC, ISO 12944, and client-specific coating specifications throughout the full project lifecycle.
NACE Inspection
Ensuring structural integrity & regulatory compliance
API 510: Pressure Vessel Inspection
API 510 is a widely recognized standard developed by the American Petroleum Institute (API) that provides guidelines for the inspection, repair, alteration, and rerating of in-service pressure vessels. This standard is crucial for ensuring the safety, reliability, and integrity of pressure vessels used in various industries, particularly in the oil and gas sector, chemical processing, and power generation.
Scope / Focus
- Applies to pressure vessels designed to operate at pressures greater than 15 psi.
- Covers inspections during operational life: routine, periodic, and special inspections.
Key Objectives & Process
- Ensure pressure vessels are safe for operation.
- Identify potential issues before they lead to failures.
- Provide guidelines for maintenance, repair, and defect evaluation.
API 510 Inspection
Ensuring structural integrity & regulatory compliance
API 570 Inspection
Ensuring structural integrity & regulatory compliance
API 570: Piping Inspection
API 570 provides guidelines for the inspection, repair, alteration, and rerating of in-service piping systems. This standard is particularly relevant in industries such as oil and gas, petrochemical, and chemical processing, where piping systems are critical for transporting fluids and gases safely and efficiently.
Scope / Focus
- Applies to piping systems transporting hazardous materials.
- Covers carbon steel, stainless steel, and other piping materials.
- Includes routing, periodic, and special inspections using NDT methods like UT, RT, and MT.
Key Objectives & Process
- Ensure the integrity and safety of piping systems.
- Identify potential issues before they lead to failures.
- Guidelines for maintenance, repair, and defect evaluation (corrosion, cracks).
API 579: Fitness-For-Service (FFS)
API 579 provides guidelines for evaluating the fitness of in-service equipment, such as pressure vessels, piping, and storage tanks, to continue operating safely and effectively despite the presence of damage or degradation.
Scope / Focus
- Applies to pressure vessels, piping systems, and storage tanks.
- Addresses damage mechanisms like corrosion (uniform, localized, pitting), cracking (fatigue, brittle), and deformation.
Key Objectives & Process
- Level 1 Assessment: Qualitative preliminary evaluation.
- Level 2 Assessment: Semi-quantitative analysis calculating remaining strength.
- Level 3 Assessment: Detailed quantitative analysis using advanced engineering (e.g., Finite Element Analysis).
API 579 Inspection
Ensuring structural integrity & regulatory compliance
API 580 Inspection
Ensuring structural integrity & regulatory compliance
API 580: Risk-Based Inspection (RBI)
API 580 provides guidelines for implementing a risk-based approach to the inspection of in-service equipment. The goal is to enhance the effectiveness of inspection programs by focusing resources on the equipment and areas that present the highest risk to safety, environmental protection, and operational reliability.
Scope / Focus
- Identify Assets & Hazards: Cataloging equipment and identifying potential damage mechanisms.
- Assess Consequences: Evaluating the impact of failure (safety, environmental, economic).
- Assess Likelihood: Estimating failure probability based on historical and inspection data.
Key Objectives & Process
- Use Risk Matrix to prioritize high-risk equipment for more frequent/detailed inspections.
- Integrate RBI principles with API 510, 570, and 579 programs.
- Optimize inspection resources and minimize operational risks.
API 653: Above-Ground Storage Tank Inspection
API 653 provides guidelines for the inspection, repair, alteration, and reconstruction of above-ground storage tanks (ASTs) used in the petroleum and chemical industries. This ensures the structural integrity and safety of tanks holding hazardous materials.
Scope / Focus
- Applies to above-ground storage tanks built to API 650 or API 12C.
- Involves Visual, Internal (emptied and cleaned), and External inspections.
Key Objectives & Process
- Address uniform corrosion, localized pitting, stress corrosion cracking, and settlement.
- Provide criteria for when tank repairs and alterations are necessary.
- Evaluate whether reconstruction is needed if the tank no longer meets safety standards.
API 653 Inspection
Ensuring structural integrity & regulatory compliance
API 936 Inspection
Ensuring structural integrity & regulatory compliance
API 936: Refractory Inspection
API 936, 'Refractory Quality Assurance,' provides guidelines for the inspection and quality assurance of refractory materials used in high-temperature applications like fired heaters, reformers, kilns, and incinerators.
Scope / Focus
- Covers castable refractories, brick refractories, precast shapes, and insulating refractories.
- Involves multi-stage inspections: Material, Installation, and Post-Installation.
Key Objectives & Process
- Ensure refractory linings perform effectively to protect structural components from extreme heat.
- Execute quality assurance programs covering material selection and supplier qualification.
- Perform testing via visual inspection, NDT, destructive compressive strength tests, and thermal cycling.
Ready to Discuss Your Inspection Requirements?
Contact our certified inspection experts for API-compliant assessment of your assets.