API 653 Tank Inspection Services (NDT) for Aboveground Storage Tanks

Dexon Technology delivers API 653 tank inspection with: 
• 45 years of inspection experience 
• Advanced tank floor scanning and structural assessment capability 
• A highly certified workforce 

Using proven non-destructive testing (NDT) methods, Dexon enables operators to accurately assess tank integrity—identifying corrosion, metal loss, weld defects, settlement, and deformation. 

With efficient execution developed over decades, inspections are carried out with minimal distruption to support: 
• Safe operation 
• Regulatory compliance (API 653) 
• Structural reliability 
• Long-term asset integrity 

This page covers: 
• Inspection techniques and capabilities 
• Access solutions for difficult-to-reach areas 
• Accreditations and certifications 
• Area of operations – Thailand, Singapore & Southeast Asia 
• Why tank operators choose Dexon 

Inspection Techniques & Capabilities

Inspection Scope (External vs Full Tank) 

External Inspection (In-Service) 
• VT and UTM of shell and roof 
• Settlement, plumbness, and deformation checks 
• Grounding system verification 

Full Tank Inspection (Out-of-Service) 
• Internal VT and full UTM coverage 
• MFL floor scanning for corrosion mapping 
• MT / PT of welds and critical joints 
• Vacuum box testing for leak detection 
• Structural reassessment and deformation analysis 

Access Solutions for Difficult-to-Reach Areas 

Dexon combines rope access and drone-based inspection to ensure full tank coverage while minimizing setup time: 
• Rope Access (IRATA-certified): Direct inspection of tank shells, roofs, and elevated structures without scaffolding 
• Drone Inspection (RVI): Rapid visual screening of tank roofs and external areas; UT drone loadouts also enable rapid UTM inspection 

Accreditations & Certifications for API 653 Inspection 

Area of Operations – Thailand, Singapore & Southeast Asia 

Dexon Technology delivers API 653 inspection services across Thailand, Singapore, and Southeast Asia, supporting operators in oil & gas, petrochemical, and storage sectors. 

Primary Coverage 
• Thailand & Singapore – Refineries, tank farms, and terminals 
• Eastern Economic Corridor (EEC) – Industrial hubs in Rayong, Chonburi, Chachoengsao 
• Singapore energy hub – High-criticality tank inspection 

Southeast Asia Operations 
• Malaysia, Indonesia, Vietnam, Philippines 
• Tank inspection across regional storage facilities 

Deployment Capability 
• Rapid mobilization from Thailand and Singapore 
• Experience in shutdown and in-service inspection environments 
• Confined space entry and specialized access capability 
• Compliance with regional regulatory and safety requirements 

Why Tank Operators Choose Dexon Technology 

Dexon Success Metrics

• 96% customer satisfaction rating 
• 500+ projects completed annually 
• 60+ awards and accreditations 
• 45 years of experience inspecting and certifying storage assets 

Talk to Dexon for API 653 Tank Inspection