AITECH performs external inspections of aboveground storage tanks (ASTs) following API 653 to assess the mechanical integrity, safety condition, and suitability for continued service.
Our API 653 Certified Inspectors from the American Petroleum Institute conduct a detailed visual examination of the tank’s exterior, including:
Shell, roof, nozzle, foundation, and coating conditions.
Detection of cracks, corrosion, deformation, foundation settlement, or coating failure.
Verification that the tank remains safe for operation or suitable for further detailed inspections.
Inspections are performed in accordance with Appendix C1 – API 653 (Checklist for Tank Examination Items).
All findings are recorded and compiled into a comprehensive inspection report following AITECH’s reporting format.
To evaluate the structural condition in detail, AITECH performs the following advanced tests:
Settlement Survey Test (SST) – to assess tank settlement and foundation deformation.
Plumbness Test (PNT) – to verify tank verticality.
Roundness Test (RNT) – to measure tank shell circularity.
Ultrasonic Thickness Measurement (UTM) – to determine shell, roof, nozzle, and reinforcement pad thickness.
Eddy Current Testing (ET) – to inspect weld surface conditions and detect surface-breaking defects.
Each inspection task includes independent data records, calibration sheets, and result reports, following AITECH’s standard NDT, UTM, and survey procedures.
The collected data are used to:
Calculate the corrosion rate (CR).
Estimate remaining tank life (RL).
Plan the next inspection interval (NII) according to API 653 recommendations.
Acoustic Emission (AE) Testing is a non-invasive method that allows assessment of the tank shell and bottom conditionwithout internal entry or extended downtime.
AITECH’s AE technology detects active corrosion, leakage, and structural anomalies while the tank remains partially filled.
Obtain work permit according to site safety regulations.
Mobilize personnel and AE equipment to the inspection site.
Adjust tank product level suitable for inspection and isolate the tank from flow lines.
Allow stabilization for 6–24 hours before testing.
Install AE sensors on the tank shell and bottom as per API 653 recommendations.
Perform sensor calibration and system verification.
Conduct AE monitoring and data acquisition to identify possible leaks, cracks, or corrosion activity.
Remove sensors and restore the site after inspection.
Resume normal tank operation after system verification.
No need for tank entry or internal cleaning.
Detects active damage mechanisms in real-time.
Reduces downtime and inspection cost.
Enhances safety and reliability for continued operation.
Fully compliant with API 653, ASTM E610, and AEIA guidelines.
Upon completion, AITECH provides:
Detailed inspection reports and AE data analysis.
Corrosion rate and remaining life calculations.
Recommendations for repair or re-inspection intervals.
Digital records, photographs, and 3D survey models (if required).
Certified API 653 Inspectors & ASNT Level III Experts.
Proven experience with major oil, gas, and chemical facilities in Vietnam and the Asia-Pacific region.
Integrated NDT, UTM, and AE capabilities with international traceability.
Commitment to safety, quality, and reliability in all inspection projects.
AITECH JOINT STOCK COMPANY
THE RELIABILITY OF NON-DESTRUCTIVE TESTING
Headquarter:119/27 Bui Quang La Street, An Hoi Tay Ward, Ho Chi Minh city.
Brach: No. 23, Street 27, Van Phuc Residential, Hiep Binh Ward , Ho Chi Minh City
Phone: (+84) 908 886 827, 0981398185
Email:maianhtai@ndt.com.vn
