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Storage Tanks

API 579 Fitness for Service Assessments

If your Storage Tank doesn’t meet criteria by EEMUA 159 or API 653, our Specialist API 579 Fitness For Service Assessments can help.

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What is it? Key benefits How we work The process Why choose us

What is API 579 Fitness for Service Assessments?

API 579 Fitness for Service Assessments are suitable for tank shells that exhibit localised corrosion that exceeds the allowable limits defined in EEMUA 159 or API 653 standards. However, it is important to note that these assessments are not applicable for tanks with widespread or severe corrosion or for tanks that have already undergone significant repairs or modifications. 

If your Storage Tank  does not meet required thickness criteria as per EEMUA 159 (or API 653) standard calculations due to localised corrosion, further assessment on the locally corroded area can be conducted to potentially assure integrity, possibly avoiding repairs or reducing capacity/inspection intervals.

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Key benefits of API 579 Fitness for Service Assessments

Extend tank service life

By confirming the integrity of the localised corrosion area, you can potentially avoid costly repairs or replacements, extending the lifespan of your tank shell and reducing your overall maintenance costs.

Avoid capacity reductions and inspection interval changes

If the assessment demonstrates that the tank shell can still safely operate, you can avoid capacity reductions or more frequent inspections, ensuring uninterrupted operations and maintaining efficiency.

Prevent unexpected outages

By identifying and addressing localised corrosion issues proactively, you can minimise the risk of unexpected outages caused by structural failures, ensuring the continued reliability of your tank.

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The industry requires competence to be demonstrated, typically through UKAS accreditation, which is a prerequisite for many major clients. BES is type A accredited, which is preferred, they can provide highly objective opinions.

Customer

Senior Project Manager

The BES inspectors are way more technically competent and diligent compared to other providers. BES definitely stands out due to their strong technical competence and strong back office support.

Customer

Project Operations Manager

BES is a really disruptive force in the market, they are able to provide a variety of necessary services to their customers and none of the other big players are able to provide that breadth of services.

Industry competitor

We have been with BES for the past 5 years and don’t plan on switching providers. They are very flexible with their services and are able to bring the best inspectors who can deal with on the ground challenges and build real relationships with clients.

Customer

Global Technical Services Manager

API 159 assessments from BES Group

Don’t let localised corrosion compromise the integrity of your tank shell. An API 579 Fitness for Service Assessment can provide valuable insights into the condition of your tank, allowing you to make informed decisions about its continued use and maintenance.

We employ a standardised API 579 assessment process that ensures a rigorous and consistent evaluation of your tank shell’s condition.  

By investing in this assessment, you can protect your investment, ensure operational continuity, and potentially extend the service life of your tank shell. 

 

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Our process

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Our API 579 assessment process encompasses the following key steps

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01

Preliminary inspection

We conduct a thorough inspection to locate and assess the extent and severity of localised corrosion on the tank shell.

02

Detailed UT Grid

If localised corrosion is identified, we perform a detailed UT grid to map the corrosion with precise accuracy.

03

UT data analysis

We analyse the UT data to create a detailed corrosion map, highlighting areas of significant thinning and providing a comprehensive overview of the corrosion’s impact.

04

Assessment calculations

Utilising the UT data and API 579 guidelines, we perform calculations to evaluate the remaining structural integrity of the tank shell.

05

Fitness for Service Evaluation

We conduct a comprehensive fitness for service evaluation, determining whether the tank shell can continue to operate safely with the existing corrosion or whether repairs or other measures are required.

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Why choose BES Group?

800+ expert
engineers

Our team of skilled engineers possesses a wealth of expertise.

A legacy of 160+ years
of experience

We’re always evolving our approach to future proof our services.

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35,000 satisfied customers

A strong reputation for providing exceptional service.

An end-to-end solution

Servicing the full life cycle, from concept through to decommission.

Accredited assurance

Confidence assured with all relevant certifications and accreditations.

800+ expert
engineers

Our team of skilled engineers possesses a wealth of expertise.

A legacy of 160+ years
of experience

We’re always evolving our approach to future proof our services.

An icon of people standing in a circle

35,000 satisfied customers

A strong reputation for providing exceptional service.

An end-to-end solution

Servicing the full life cycle, from concept through to decommission.

Accredited assurance

Confidence assured with all relevant certifications and accreditations.

Need more? Learn more about us

Did you know...

20 years

Life extension

20 years

Life extension

can be achieved on tank shells when carrying out a API 579 Fitness for Service Assessments, according to a study carried out by American Petroleum Institute (API).

50%

Reduction in costs

50%

Reduction in costs

of tank repairs and replacements can be achieved when API 579 assessments are carried out, according to a report by the National Association of Corrosion Engineers (NACE)

90%

Reduction in tank outages

90%

Reduction in tank outages

can be achieved following API 579 Fitness for Service Assessments, according to a study by the European Federation of Corrosion (EFC)

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