Sphere & Drum Internal Inspection

Storage spheres and process drums operate under severe pressure, thermal, and environmental conditions across refining, petrochemical, and gas-processing facilities. Maintaining their structural integrity requires rigorous internal inspection during scheduled turnaround outages to detect internal wall thinning, pitting, environmental cracking, tray-support degradation, and nozzle erosion. TechCorr delivers end-to-end Sphere & Drum Internal Inspection solutions utilizing conventional and advanced non-destructive examination (NDE) methods to assure mechanical integrity and compliance with statutory operating limits.

Internal vessel assessments demand safe entry, specialized access configurations, and thorough surface evaluation. TechCorr integrates API-certified inspectors with experienced confined-space entry and rescue personnel, utilizing certified rope access technicians to inspect the apex, top crown, and internal shell courses of large spherical tanks without interior staging. Technicians apply detailed visual testing (VT), high-resolution automated ultrasonic testing (AUT), phased array ultrasonic testing (PAUT), wet fluorescent magnetic particle testing (WFMT), and pulsed eddy current (PEC) to evaluate base metals, shell-to-head weld seams, nozzle attachments, and clad linings. Our data-driven evaluations pinpoint localized corrosion, hydrogen-induced damage, stress cracking, and weld discontinuities, providing owner-operators with exact wall-thickness profiles and flaw sizing for engineering fitness-for-service evaluations.

Key Capabilities

• Comprehensive internal visual inspection (VT) and dimensional assessment of vessel shells, heads, internal baffles, trays, demisters, and nozzle welds.
• Advanced weld inspection via phased array ultrasonic testing (PAUT) and time-of-flight diffraction (TOFD) to detect in-service crack initiation and manufacturing flaws.
• Wet fluorescent magnetic particle testing (WFMT) and dye penetrant testing (PT) for surface and near-surface crack detection in high-stress zones.
• Confined-space rope access deployment, eliminating the high cost, prolonged downtime, and safety hazards of complex internal scaffolding systems.
• High-density ultrasonic thickness mapping (UTM) across bottom-tangent lines, liquid-vapor interfaces, and localized impingement zones.

Compliance & Standards

Inspections are executed in strict accordance with API 510 (Pressure Vessel Inspection Code), API 572 (Inspection of Pressure Vessels), API 579-1/ASME FFS-1 (Fitness-For-Service), ASME Section VIII (Rules for Construction of Pressure Vessels), ASME Section V (Nondestructive Examination), and applicable OSHA/AMPP confined space and corrosion mitigation guidelines.

TechCorr’s internal inspections supply conclusive quantitative data, enabling clients to meet regulatory mandates, establish safe operational envelopes, and optimize long-term asset life cycles.