Acoustic Emission Testing (AET) Services in Lagos 2026 — Atlantis NDT

How Acoustic Emission Testing (AE) works

Acoustic emission listens rather than interrogates. Sensors on the structure detect the transient elastic waves released when a defect grows, when a crack face rubs, or when a leak turbulently escapes, while the item is under a controlled stress or pressure. It is a global, real-time method: a small number of sensors monitor an entire vessel or tank rather than a single location.

What it detects

• Active, growing defects during a controlled pressure or load test — the distinction between a flaw that is stable and one that is propagating
• Tank floor corrosion activity and leakage on in-service aboveground storage tanks without taking them out of service
• Crack growth in pressure vessels, spheres and reactors during hydrotest or over-pressure
• Leakage in valves, heat exchangers and buried lines

What it will not do

AE locates and ranks activity; it does not size or characterise a defect. Every zone it flags requires follow-up by UT, radiography or visual examination to determine what is actually there. It is also sensitive to background noise, so test conditions and sensor coupling govern the quality of the result far more than in other methods.

When Acoustic Emission Testing (AE) is the right choice

Choose AE where the question is "is anything actively degrading right now, and where" across a large item, particularly where taking it out of service for internal inspection is the expensive alternative.

Codes and acceptance criteria

Examinations are performed to written procedures qualified against ASME Section V Article 11 and Article 12, ASTM E569, ASTM E1930 for pressure vessel examination, ASTM E1067 for fibre-reinforced vessels, and API 653 Annex E practice for tank floor evaluation. Acceptance criteria come from the construction or in-service code governing the item — ASME Section VIII for pressure vessels, ASME B31.3 for process piping, API 510, API 570 and API 653 in service, AWS D1.1 for structural steel — and the applicable edition is recorded against the examination so the disposition can be reconstructed later.

Lagos context

Lagos serves as the commercial hub for Nigeria's petroleum industry, with the Dangote Refinery — Africa's largest at 650,000 bpd capacity — recently commissioned alongside existing NNPC-operated refineries and the growing deepwater offshore sector. The scale of new refinery assets and the need to establish world-class inspection data management from commissioning create an ideal environment for digital twin implementation. External corrosion from the hot, humid coastal environment and the critical nature of new export infrastructure make real-time 3D condition monitoring essential.

How the examination is controlled

Every examination carries its own evidence chain: the technician's certification for the method and level under ASNT SNT-TC-1A or ISO 9712, current on the day of inspection; the calibration status of the instrument, probes, wedges and reference blocks used, traceable under ISO 17025; and the revision of the procedure and technique sheet in force at the time. An ASNT NDT Level III reviews and signs the final disposition. That bundle is exactly what a client or accreditation audit asks for, and it is recorded as the work happens rather than assembled afterwards.

What you receive

• A report in your required format, with indications located against the component and, where relevant, against a persistent corrosion monitoring location so trends stay continuous between campaigns
• Raw data files in the instrument-native format plus an open export, so the dataset outlives any single supplier relationship
• The procedure revision, technician certification state and instrument calibration status applicable at the time of examination
• Where a finding affects continued service, a clear statement of the code clause that governs the acceptance decision

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