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Best API 653 Tank Inspection Companies

API 653 (Aboveground Storage Tank Inspection, Repair, Alteration, and Reconstruction) governs the in-service inspection of aboveground atmospheric storage tanks used in the petroleum and chemical process industries. API 653 inspection companies deploy certified inspectors (API 653 Authorized Inspector) combined with specialized NDT capabilities — ultrasonic floor scanning systems, shell thickness surveys, weld examination, and corrosion monitoring — to assess tank integrity and recommend maintenance action. Tank inspections under API 653 are performed at risk-based intervals using API RP 580 methodology, with requirements for floor condition assessment, shell assessment, roof inspection, and weld examination. Regulatory requirements from EPA (SPCC rules) and state environmental agencies also drive demand for documented API 653 inspection.

Why these suppliers?

  • ✓API 653 Authorized Inspector certification requires passing a rigorous API examination covering tank construction (API 650), inspection techniques, fitness-for-service, and repair/alteration requirements — distinct from general ASNT or API RP 578 inspection credentials.
  • ✓Tank floor inspection uses specialized automated ultrasonic scanning systems (floor scanners) and magnetic flux leakage (MFL) tools to assess floor plate condition from the tank exterior or interior — identifying corrosion and pitting without requiring tank cleaning and entry until necessary.
  • ✓API 653 inspection companies with risk-based inspection (RBI) capability can develop inspection intervals and maintenance strategies under API RP 580/581, potentially extending inspection intervals for low-risk tanks while focusing resources on higher-consequence assets.

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Frequently Asked Questions

What is an API 653 inspection and what does it cover?
An API 653 inspection assesses the condition of an aboveground atmospheric storage tank per the API 653 code. Key inspection elements include: shell thickness measurement by external UT scanning; floor condition assessment using internal UT scanning or external MFL scanning where accessible; roof inspection (floating roof seal condition, pontoon integrity, fixed roof support condition); weld examination (visual, MT, or PT on accessible welds); nozzle and connection inspection; and settlement survey. Results are documented in an inspection report that identifies remaining life, required maintenance, and recommended next inspection dates.
What is the required inspection interval for API 653 tanks?
API 653 allows risk-based inspection intervals determined by the remaining corrosion allowance and corrosion rate. For tank floors, the maximum interval between in-service inspections (external) is typically 10 years, and the interval to the next floor reconstruction or internal inspection is based on remaining life calculations. Shell inspections use UT thickness measurements to calculate corrosion rates and remaining safe operating life. With RBI per API RP 581, intervals can be extended beyond the prescriptive maximums for tanks with low calculated risk — but require documented RBI analysis.
When does a tank floor require replacement under API 653?
API 653 requires floor plate replacement when remaining thickness falls below the minimum required thickness calculated from the corrosion rate and remaining life assessment. Minimum required thickness is typically 0.10 inches (2.5 mm) for the tank floor, though the calculation considers corrosion rate, allowable stress, and remaining service life until the next inspection. Tank floor condition assessment by MFL scanning or ultrasonic floor scanner can identify areas of significant wall loss requiring patch repair or plate replacement before tank failure.