What is Storage Tank Inspection?
Storage Tank Inspection involves both in-service and out-of-service inspections of vertical and horizontal bulk storage tanks, located above or below ground. These inspections utilize a combination of techniques to comprehensively assess tank floors, shells, roofs, and structural integrity.
Relevant Industry Standards
API 620 – Welded Low-Pressure Storage Tanks
Applicable for above-ground tanks with a single vertical axis.
Key Specifications:
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Internal pressure: > 3.4 KPA (0.5 PSIG) but ≤ 103 KPA (15 PSI)
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Metal temperature: −168°C to +120°C
API 650 – Welded Steel Tanks for Oil Storage
Designed for vertical, cylindrical, above-ground storage tanks.
Key Specifications:
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Internal pressure: Atmospheric to 17 KPA (2.5 PSIG)
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Non-refrigerated
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Design temperature: < 200°F
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Suitable for petroleum, liquid products, or water
API 653 – Tank Inspection, Repair, Alteration, and Reconstruction
Covers API 650 tanks already in service.
Sections Include:
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Suitability for service
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Inspection procedures
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Reconstruction and repair
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Welding standards
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Examination and testing
Types of Storage Tanks
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Fixed Roof Tanks
Permanently affixed cone or dome-shaped roof; older types may be riveted or bolted. -
External Floating Roof Tanks
Open-topped tanks with a floating deck that adjusts with liquid level. -
Internal Floating Roof Tanks
Feature both a fixed roof and an internal floating deck, either contact or non-contact. -
Domed External Floating Roof Tanks
Retrofitted tanks with an aluminum self-supporting dome roof and external floating deck. -
Horizontal Tanks
Used for above-ground or underground service; made of steel or FRP. -
Spherical Pressurized Tanks
Used for high-pressure storage, supported by legs or concrete foundation. -
Variable Vapor Space Tanks
Equipped with expandable vapor reservoirs to accommodate volume changes. -
LNG Tanks
Specialized tanks for Liquefied Natural Gas, operating at −162°C, typically double-walled for insulation.
Why Choose TUV Austria Bureau of Inspection & Certification for Storage Tank Inspection?
As a leading inspection service provider, TUV Austria Bureau of Inspection & Certification ensures compliance with international standards for the evaluation, inspection, and testing of storage tanks. With a robust network of certified inspectors across Pakistan, we deliver accurate, timely, and cost-effective inspection solutions across all industries.
Our Storage Tank Inspection Services Include:
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Welding procedure qualification to international standards
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Leak detection and material strength evaluation
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Project management and construction supervision
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Identification plate stamping and adjustments
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External thickness measurements and calculation reviews
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Automated tank floor scanning
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Assessment of water and sludge accumulation
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3D modeling of tank floor and shell
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Subsoil corrosion evaluation
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Environmental risk analysis
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Hydrotesting
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Non-Destructive Testing (NDT)
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Ultrasonic thickness and density testing
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Tank floor volume measurement
Additional Services Offered by TUV Austria Pakistan
Alongside Storage Tank Inspection, we offer a broad range of inspection services, testing, and compliance solutions:
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