Aboveground storage tanks: SPCC integrity test FAQs
Integrity matters, especially when it’s the one factor standing between your aboveground storage container and the accidental release of thousands of gallons of oil. Consistently checking the structural soundness of aboveground storage tanks (ASTs) is vital to preventing spills and the potential related consequences.
Facilities covered by the Environmental Protection Agency’s (EPA’s) Spill Prevention, Control, and Countermeasure (SPCC) rule must inspect and test ASTs for integrity regularly. By comparing the test results, facilities can monitor changes in the condition of ASTs and determine whether it’s safe to keep using them.
Consider these FAQs about inspections and tests to help ensure your facility’s aboveground tanks are structurally sound.
What do industry standards have to do with integrity testing?
The answer in one word is everything. EPA’s SPCC rule requires facilities to regularly inspect and test ASTs in accordance with industry standards (40 CFR 112.8(c)(6)). The standards are technical guidelines that serve as the minimum practices accepted for inspections and tests.
The regulations require facilities to develop and implement an SPCC Plan to prevent, prepare for, and respond to oil spills. In the plan, facilities establish how they’ll conduct integrity inspections and tests for ASTs (referred to as bulk storage containers in the regulations). If your SPCC Plan states that the facility will use a specific industry standard for integrity inspections and tests, it must comply with all relevant parts of that standard.
In EPA’s Spill Prevention, Control and Countermeasure Plan (SPCC) Program Bulk Storage Container Inspection Fact Sheet, the agency references two industry standards frequently used for integrity inspections and tests:
- American Petroleum Institute (API) Standard 653, Tank Inspection, Repair, Alteration, and Reconstruction; and
- Steel Tank Institute (STI) SP001, Standard for the Inspection of Aboveground Storage Tanks.
When should facilities conduct integrity tests?
EPA requires facilities to inspect or test ASTs for integrity:
- On a regular schedule, and
- Whenever you make material repairs.
Your facility must use industry standards to determine the types and frequency of inspections and tests needed. These considerations have to be based on the AST’s size, configuration, and design.
Who can conduct integrity tests?
Generally, industry standards mandate that certified individuals conduct integrity inspections and tests. The standards should describe the qualifications an individual must have to be considered certified. This may involve certifying individuals in your facility or hiring certified personnel.
What are the types of integrity inspections and testing?
The proper type of integrity inspection or test (which must be nondestructive) depends on the specific container and its configuration. Industry standards identify the type of inspection or test needed and may require using a combination of methods. Examples include:
- Acoustic emissions testing,
- Helium leak testing,
- Hydrostatic testing,
- Inert gas leak testing,
- Liquid penetrant examinations,
- Magnetic flux leakage scanning,
- Magnetic particle examinations,
- Radiographic testing,
- Ultrasonic testing,
- Ultrasonic thickness measurements,
- Vacuum box testing,
- Visual inspections, and
- Weld inspections.
Industry standards may require your facility to establish baseline conditions for ASTs that haven’t undergone integrity testing or where such information isn’t available (e.g., when a business purchases a facility with ASTs). The baseline evaluation determines the container’s metal thickness, corrosion rates, and likely remaining service. Facilities then compare the results of subsequent integrity inspections and tests with the baseline data.
What are the recordkeeping requirements?
The SPCC rule requires facilities to maintain integrity inspection and test records (namely, comparison records) for at least 3 years. These records must be signed by the supervisor or inspector and kept with the SPCC Plan. Consider maintaining these records for the life of the AST, especially since many industry standards recommend it.
What’s a hybrid inspection program?
Sometimes, an alternative inspection program may be more appropriate than using an industry standard. If your facility and a certified Professional Engineer (PE) determine this to be the case, you can implement an environmentally equivalent inspection program. The SPCC rule also allows some facilities to replace certain parts of an industry standard with environmentally equivalent approaches.
However, these hybrid (site-specific) programs have additional regulatory requirements. A facility with a hybrid inspection program must include in the SPCC Plan:
- A certification by the PE of the alternative program,
- An explanation of why the facility isn’t using industry standards,
- A comprehensive description of the alternative program, and
- A description of how the alternative provides the same environmental protection as the relevant industry standard.
What about state requirements?
State and local AST regulations must be at least as stringent as EPA’s requirements. However, some may require additional or stricter compliance obligations. Verify AST rules with the state environmental agency.
Key to remember: Industry standards determine how a facility conducts integrity inspections and tests on aboveground storage tanks.


















































