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Fitness-for-Service Assessment Codes & Standards Explained

Buyers of fitness-for-service assessment tend to ask the same questions: what is actually included, what does it cost, which standards apply and how do you pick a reliable partner? This article answers all four with the level of detail your project team needs.

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Key takeaways3 min read4 sections

The short version

  1. 1The standards that govern fitness-for-service assessmentFitness-for-Service Assessment is governed by ASME Sec VIII Div 2, API 579, EN 13445 Annex B.
  2. 2How code compliance is demonstratedCompliance is shown through documentation, not assertion. Your package should include:
  3. 3Common compliance mistakesThe most frequent compliance failures we see in fitness-for-service assessment are edition drift (working to a superseded code edition), mixing code systems mid-package, and missing project-specific overlays.
  4. 4Working across multiple jurisdictionsGlobal projects often need one package that satisfies several jurisdictions.
  5. 5The bottom lineName the edition, not just the code family — ASME Sec VIII Div 2 compliance is demonstrated through a documented design basis, calculations and a checker's sign-off.

Quick answer

In short, fitness-for-service assessment means assessing damaged or corroded equipment per API 579 to extend safe operating life. The work is governed by ASME Sec VIII Div 2 and API 579, executed on licensed ANSYS Mechanical Enterprise and checked against a documented QA checklist before issue.

The standards that govern fitness-for-service assessment

Fitness-for-Service Assessment is governed by ASME Sec VIII Div 2, API 579, EN 13445 Annex B. Which one leads depends on the project location and the owner's specification — a US refinery package and a European commercial building may need the same discipline executed to entirely different rules.

Beyond the headline code, most projects layer client specifications on top: operator standards (Shell DEPs, Saudi Aramco SAES, ADNOC), fabricator preferences and local authority requirements. A good fitness-for-service assessment partner maps all of them into a compliance matrix at kick-off.

How code compliance is demonstrated

Compliance is shown through documentation, not assertion. Your package should include:

  • Design basis / basis-of-design note referencing the governing code and edition.
  • Calculation reports with load combinations and acceptance criteria.
  • Drawings flagged with the applicable code and material grades.
  • A documented checker's review with sign-off.
  • Revision-controlled transmittals so the latest code-compliant issue is unambiguous.

Common compliance mistakes

The most frequent compliance failures we see in fitness-for-service assessment are edition drift (working to a superseded code edition), mixing code systems mid-package, and missing project-specific overlays. Each is avoidable with a kick-off compliance matrix and a senior review gate.

Working across multiple jurisdictions

Global projects often need one package that satisfies several jurisdictions. We deliver fitness-for-service assessment to ASME Sec VIII Div 2 and API 579 routinely and maintain checklists for each, so multi-code packages are reviewed against every governing standard, not just the primary one.

Fitness-for-Service Assessment — codes & standards

Fitness-for-Service Assessment Codes & Standards Explained: FAQ

Which code applies to fitness-for-service assessment?

In short, fitness-for-service assessment means assessing damaged or corroded equipment per API 579 to extend safe operating life. The work is governed by ASME Sec VIII Div 2 and API 579, executed on licensed ANSYS Mechanical Enterprise and checked against a documented QA checklist before issue.

Which software is used for fitness-for-service assessment?

We deliver on licensed ANSYS Mechanical Enterprise and issue native files plus PDF, DWG and IFC on request.

Which standards do you follow for fitness-for-service assessment?

We work to ASME Sec VIII Div 2, API 579, EN 13445 Annex B, plus client specifications such as Shell DEPs and major operator standards.

How long does a fitness-for-service assessment package take?

Small packages are typically delivered in 3–7 working days; larger scopes are split into phased submissions agreed at kick-off.

How do I get a quote for fitness-for-service assessment?

Send your drawings or scope through our quote form — a senior engineer reviews them and returns a fixed-price proposal within 24 hours, free and without obligation.

Code by code

The standards behind a fitness-for-service assessment package

Each standard below governs a different slice of the scope. A compliant package names the edition of every one that applies and carries the evidence in the transmittal.

Multi-jurisdiction projects need the package reviewed against every governing standard — not only the primary one named in the contract.

  1. ASME Sec VIII Div 2Global

    Governs design by analysis — elastic and elastic-plastic routes with formal stress categorisation.

    Evidence: linearised stress results at each classification line against Pm, PL+Pb and range limits.

  2. API 579Global

    Governs fitness-for-service assessment of in-service damage such as metal loss, cracks and creep.

    Evidence: a level 1, 2 or 3 assessment report with remaining life and a re-inspection interval.

  3. EN 13445 Annex BEurope & UK

    Governs design by non-linear analysis — gross plastic deformation, instability and fatigue checks.

    Evidence: non-linear results with the design check, load cases and partial factors stated.

Work through this

The fitness-for-service assessment checklist

Fifteen points, in the order you will need them — from assembling the enquiry to signing off the final transmittal. Tick them here, or copy them into your own project procedure.

15 checks
01

Before you send the enquiry

Everything a supplier needs in order to price accurately.

02

Proving compliance

Compliance is documented, never asserted.

03

Before you accept the package

Fifteen minutes here saves a fabrication hold.

About this guide

How we know this

Written from delivered work
The guidance here comes from live fitness-for-service assessment packages produced on licensed ANSYS Mechanical Enterprise — not from a content brief.
Checked against the governing codes
Every technical statement is cross-read against ASME Sec VIII Div 2, API 579, EN 13445 Annex B and the operator specifications our teams work to daily.
Reviewed through the same checker gate
A senior engineer who signs off fitness-for-service assessment deliverables reviewed this article, using the independent-check process every client package passes through.
Revised when the standards move
Articles are re-read and re-stamped whenever a governing code edition, software release or client specification changes materially.

2009

Engineering since

1,200+

Projects delivered

40+

Countries served

60+

In-house engineers

Reviewed by

Finite Element Analysis practice

Senior engineer, SES finite element analysis team

Last reviewed
14 January 2026
Review gate
Independent checker

Working toolset

ANSYS Mechanical Enterprise

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Read next: What Is Fitness-for-Service Assessment? A Complete Guide

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