API Tank Inspection Services: When and Why to Use Them

Above-ground storage tanks are critical assets in industries ranging from petroleum and chemicals to agriculture and water treatment. These tanks must be designed, maintained, and inspected to rigorous standards to ensure safety, reliability, and environmental compliance. That’s where API standards come in—and where DEG Survey & Inspection delivers trusted expertise.

What Are API Standards?

The American Petroleum Institute (API) has developed internationally recognised standards for the design, inspection, and maintenance of storage tanks, piping systems, and pressure vessels. The most relevant for tank inspections include:

• API 653 – Inspection, repair, alteration, and reconstruction of steel above-ground storage tanks
• API 570 – In-service inspection of piping systems
• API 510 – Inspection and rerating of pressure vessels

These standards are widely adopted across New Zealand and Australia, and referenced by regulatory bodies including the EPA and local councils.

When Should API Tank Services Be Used?

API tank inspections should be scheduled based on:

• Regulatory requirements – Periodic inspections are mandated for tanks storing hazardous or regulated substances
• Operational changes – After repairs, alterations, or changes in stored product
• Age and condition – Older tanks or those showing signs of corrosion, settlement, or leakage
• Risk management – To prevent costly failures, environmental damage, or safety incidents
• Commissioning and recommissioning – Before a tank enters or re-enters service

API 653 inspections are especially important for tanks operating at atmospheric pressure, such as those storing oil, water, or chemicals. These inspections assess structural integrity, corrosion levels, and remaining service life.

DEG’s API Tank Capabilities

DEG Survey & Inspection provides certified API inspection services across New Zealand, including:

• API 653 tank inspections (in-service and out-of-service)
• API 570 piping system evaluations
• API 510 pressure vessel assessments
• Remnant life calculations and compliance reporting
• Alignment with NZ, Australian, international, and EPA standards
• Support for maintenance planning and operational scheduling

Our inspectors are qualified to assess tank integrity, recommend repair scopes, and ensure all documentation meets regulatory and industry expectations.

Why It Matters

A thorough API inspection helps prevent leaks, structural failures, and unexpected downtime. It also supports compliance with environmental and safety regulations, protects valuable assets, and extends the life of critical infrastructure.

Summary
DEG Survey & Inspection offers certified API inspection services for tanks, piping, and pressure vessels, helping clients meet legal obligations and maintain safe, reliable operations. Whether for routine maintenance, risk mitigation, or regulatory compliance, our team delivers expert evaluations aligned with API 653, 570, and 510 standards.