A Smarter Way to Inspect

It’s costly and time consuming to inspect storage tanks. To optimize costs and inspection schedules, Risk-Based Inspection (RBI) 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 and projected financial impact 
  • Develop a repeatable risk assessment across the entire organization 
  • Proactively evaluate how change of service may impact inspection schedules 
  • Reduce the risk of an unexpected failure 

Jurisdictional Regulations for Tank Risk-Based Inspection

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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 & production 
  • Safety area (applicable only to shell courses) 

All these procedures use data that is straightforward to determine and very basic to a tank’s design.


Tank Integrity Management Program (IMP)

Expand your existing tank integrity management program 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 to concentrate inspections efforts by combining a proactive tank fitness-for-service [hyperlink] 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 probability of failure (POF). Common storage tank damage mechanisms are: internal corrosion, internal thinning, external corrosion and corrosion under insulation (CUI).  


Tank RBI Expertise

As an RBI industry leader, we continue to foster innovation by performing cutting-edge research and development into software tools and procedures to improve industry practices.  API RBISagePlusTM and the Equity Engineering Practices (EEPs) include our knowledge of storage tanks, tank RBI and tank Fitness-for-Service to help terminal and tank farm personnel with a facility’s Integrity Management Program (IMP). 

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

E2G Help Desk Services


Our Help Desk IT specialists and engineers are available for questions about all E2G products. Our goal is to facilitate upgrades and conversions, quickly answer your questions, and help you benefit from our state-of-the-art software products.

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