A Smarter Way to Inspect

It’s costly and time-consuming to inspect storage tanks. Many facilities apply risk-based inspection (RBI) techniques to defer these costly internal inspections that were scheduled using a time-based interval.

Proactively applying RBI to storage tank inspections will optimize costs and inspection schedules and can replace the traditional API 653, time-based inspection intervals for initial and all subsequent inspections of storage tanks. E2G offers a quantitative RBI methodology, based upon API 581, to help organizations and tank farm or terminal personnel:

Align inspection strategy with risk & projected financial impact

Develop a repeatable risk assessment across the entire organization

Proactively evaluate how change of service will impact inspection schedules

Reduce the risk of an unexpected failure

Tank RBI Methodology

Tank RBI follows API RP 581 to calculate risk using the probability of failure (POF) and consequence of failure (COF) of the shell course and bottom.

POF: Loss of Containment

  • Generic failure frequency
  • Active damage mechanisms
  • Management systems factor

COF: Effects of Loss of Containment

  • Financial consequence analysis
  • Environmental clean-up, repair, and production
  • Safety area (applicable only to shell courses)

Tank RBI uses data that is straightforward to determine and is very basic to a tank’s design.

Tank Integrity Management Program (IMP)

Expand your existing tank IMP to include a quantitative tank RBI program.

  • Easily review and update risk assessments after inspections, unplanned events, or on a set interval to help keep future inspections up to date
  • Determine critical areas on which to concentrate inspections efforts by combining a proactive tank fitness-for-service (FFS) review with a tank RBI assessment
  • Evaluate the viability of a change of service program on a new or existing tank farm and understand the impact on future inspection schedules

Damage Mechanism Reviews

Identifying damage mechanisms helps predict a tank’s remaining life and potential risk for failure. During a damage mechanism review (DMR), we work with you to identify active and potential damage mechanisms and use that data to calculate the tank’s POF. Common storage tank damage mechanisms are internal corrosion, internal thinning, external corrosion, and corrosion under insulation (CUI).

Aboveground storage tanks (ASTs) can accumulate a wide range of anticipated and unanticipated damage due to service, operational upsets, and environment. Applying FFS techniques to tanks can help you make informed run-repair-replace decisions, determine remaining life, and limit the extent of repairs.

Recommended Reading

Tank RBI Expertise

E2G pioneered RBI, and we continue to foster innovation by performing cutting-edge research and developing software tools and procedures to improve industry practices. API RBI, SagePlus™ and the Equity Engineering Practices® (EEPs) apply our knowledge of storage tanks, tank RBI, and tank FFS to help terminal and tank farm personnel with a facility’s IMP.

E2G’s multi-disciplinary subject matter experts collaborate to provide clients with a repeatable risk assessment that can be applied across an organization.

Our RBI experts:

  • Have 250+ years of combined field experience
  • Served as lead investigators on API 581
  • Developed the only API-branded and fully compliant API 581 RBI software
  • Collaborate with FFS and materials & corrosion experts to manage an asset’s lifecycle