# Fitness for Service Simulation

Simulation-driven Fitness-for-Service assessments to evaluate structural integrity, remaining life, and asset integrity decisions.

(SIMULIA Maintenance Engineering & Fitness for Service Rich Text) Evaluating Equipment Fitness for Service

Critical assets inevitably degrade over their service life. Be it refining oil, generating nuclear energy, or building batteries, the equipment and infrastructure suffer damage over time. When this damage is identified, organizations need to determine not only the extent of the flaw, but whether equipment can continue to operate safely and efficiently under existing conditions.

**SIMULIA's Fitness-for-Service solutions** combine established assessment methodologies with advanced simulation capabilities to evaluate the structural integrity of pressure vessels, piping systems, and other critical equipment. By enabling a **realistic understanding of damage mechanisms** and their impact on performance, engineers can assess remaining life, support compliance requirements, and make informed decisions to run as-is, rerate, repair, or replace assets with confidence.

Key Benefits of Fitness for Service Simulation

(Benefit Title) Cost Efficiency

 ![](https://www.3ds.com/assets/invest/2020-12/icon-074-reduce-cost.png)

(Benefit Title) Extended Asset Life

 ![](https://www.3ds.com/assets/invest/2021-01/icon-416-machine-boost.png)

(Benefit Title) Informed Decisions

 ![](https://www.3ds.com/assets/invest/2020-07/icon-413-data-leveraging.png)

(Benefit Title) Regulatory Compliance

 ![](https://www.3ds.com/assets/invest/2023-05/icon-405_compliance-check.png)

(SIMULIA Maintenance Engineering & Fitness for Service Highlight) Simulation-Driven FFS Assessments

As industrial assets age, operators face increasing pressure to ensure safety, maximize equipment availability, and make informed decisions about continued service.

Fitness-for-Service (FFS) assessments help determine whether damaged or aging equipment can continue operating safely. This session explores the three API 579 assessment levels and demonstrates how Abaqus and the **3D**EXPERIENCE platform evaluate damage mechanisms, including metal loss, crack-like flaws, shell distortions, and hydrogen embrittlement, to support informed decisions on running as-is, rerating, repairing, or replacing.

[Maintenance Engineering and Fitness for Service Webinar](/media/25204)

(SIMULIA FFS Workflows) Fitness for Service Simulation Workflows

Metal Loss

Simulation is used to evaluate the structural impact of wall thinning and corrosion damage, helping determine remaining strength and safe operating limits.

- Remaining wall thickness and stress redistribution
- Burst pressure and collapse resistance evaluation
- Remaining life and reassessment interval estimation

[Metal Loss](/media/25025)

Weld Misalignment and Shell Distortion

Simulation is used to analyze geometric imperfections and welding-induced distortions, helping assess their effect on structural integrity and code compliance.

- Stress intensification due to misalignment and distortion
- Residual stress and deformation assessment
- Buckling susceptibility and fitness evaluation

[Weld Misalignment and Shell Distortion](/media/25026)

(SIMULIA FFS H3) Crack Flaws

Simulation is used to determine the acceptability of crack-like defects under service loads, helping predict crack growth and fracture risk.

- Fracture mechanics and crack driving force evaluation
- Crack propagation and remaining life prediction
- Critical flaw size and failure assessment

[Crack Flaws](/media/25030)

(SIMULIA FFS H4) Dent

Simulation is used to evaluate localized deformation damage and its interaction with operational loading, helping determine repair or continued service suitability.

- Local strain and stress concentration analysis
- Structural integrity under pressure and external loads
- Dent interaction with corrosion or crack defects

[Dent](/media/25031)

(SIMULIA FFS H6) Hydrogen Embrittlement

Simulation is used to assess material degradation caused by hydrogen exposure, helping evaluate susceptibility to cracking and brittle failure.

- Hydrogen diffusion and trapping behavior
- Embrittlement-induced loss of ductility and fracture toughness
- Crack initiation risk and do failure assessment

[Hydrogen Embrittlement](/media/25034)

(SIMULIA FFS H5) Fatigue

Simulation is used to evaluate cyclic loading effects and accumulated damage, helping estimate remaining fatigue life and inspection requirements.

- Cyclic stress evaluation and damage accumulation
- Fatigue crack initiation and propagation analysis
- Remaining useful life and inspection interval planning

[Fatigue](/media/25033)

## (SIMULIA Maintenance Engineering & Fitness for Service Marketing Asset WOC) SIMULIA Fitness for Service Simulation Resources

Explore the technological advancements, innovative methodologies, and evolving industry demands that are reshaping the world of Fitness for Service. Stay a step ahead with SIMULIA. Discover now.

FAQs about Fitness For Service Simulation

Which SIMULIA products are used for FFS assessments?

Key SIMULIA solutions include: Abaqus for nonlinear structural and thermal analysis, fe-safe for fatigue and remaining life prediction, Isight for automation, parametric studies, and sensitivity analysis, 3DEXPERIENCE Platform for seamless integration of model and simulation, collaboration and democratization.

How does simulation-based FFS differ from traditional handbook calculations?

Traditional empirical methods rely on conservative assumptions and simplified formulas. SIMULIA’s simulation-based approach uses actual geometry and loading conditions, captures complex stress states and material behavior, reduces unnecessary conservatism, enables more accurate remaining life and decisions on managing flawed equipment

What types of damage can be assessed using SIMULIA for FFS?

SIMULIA enables assessment of a wide range of damage mechanisms, including: Brittle Fracture, General Metal Loss, Local Metal loss, Pitting Corrosion, Hydrogen Damage, Weld Misalignment and Shell Distortions, Crack-Like Flaws, High Temperature Operation and Creep, Fire Damage, Dents, Gouges and Dent-Gouge Combinations, Laminations, Fatigue

Which industry standards does SIMULIA support for FFS?

SIMULIA solutions support assessments aligned with major industry standards, including: API 579 / ASME FFS-1, ASME Section VIII, BS 7910, EN standards and company-specific guidelines. These standards are implemented through physics-based simulation rather than simplified screening curves or formulas.

What is Fitness for Service (FFS)?

Fitness for service assessments are quantitative engineering evaluations that are performed to demonstrate the structural integrity of an in-service component, especially a pressurized vessel, that may contain a flaw or damage or that may be operating under a specific condition that might cause a failure.

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