Structural Integrity Assessment Services for Industrial Assets

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Industrial equipment and infrastructure are often expected to operate safely and reliably for many years. Over time, however, exposure to high temperatures, pressure, vibration, corrosion, erosion, fatigue, and other operating conditions can affect the strength and performance of critical assets. Regular inspection is important, but inspection data alone may not always provide enough information to determine whether an asset can continue operating safely.

Structural integrity assessment provides a systematic engineering approach to evaluating the condition, strength, remaining life, and fitness for service of industrial equipment and structures. By combining inspection information, engineering codes, materials science, finite element analysis, and advanced computational techniques, organizations can make better-informed decisions about repair, continued operation, life extension, or replacement.

ProSIM provides structural integrity assessment services for energy-sector assets, heavy machinery, processing facilities, offshore infrastructure, oil and gas facilities, thermal power plants, and nuclear applications. Its services include Fitness for Service studies, Remaining Life Assessment and Extension, Engineering Critical Analysis, and advanced structural analysis.

What Is Structural Integrity Assessment?

Structural integrity assessment evaluates whether an existing asset can safely perform its intended function under specified operating conditions. The assessment considers the design, material properties, operating history, inspection findings, damage mechanisms, and applicable engineering standards.

Industrial equipment can deteriorate in different ways. Corrosion can reduce wall thickness, fatigue can initiate and grow cracks, creep can affect materials exposed to high temperatures, and erosion can gradually change component geometry. A comprehensive assessment considers these degradation mechanisms and determines their potential impact on structural performance.

The objective is not simply to identify damage. It is to understand whether the damage affects the asset's ability to operate safely and what action should be taken.

Fitness for Service Assessment

Fitness for Service, commonly referred to as FFS, is an important component of structural integrity engineering. It helps determine whether equipment containing defects or damage remains suitable for continued operation.

ProSIM provides Level-3 Fitness for Service assessments for aging and degraded machinery and industrial infrastructure. These assessments can evaluate permissible stress levels and structural stability under different loading conditions. The company's FFS work includes applications involving power generation equipment, oil and gas infrastructure, piping networks, stationary machinery, and static equipment.

Level-3 FFS assessments can be particularly useful when conventional inspection or simpler assessment methods cannot adequately characterize a complex defect or structural condition.

API 579 and the ASME Boiler and Pressure Vessel Code are among the standards referenced by ProSIM for its structural integrity and FFS work.

Remaining Life Assessment and Extension

Industrial assets are expensive to replace, particularly when they form part of large power plants, processing facilities, pipelines, or energy infrastructure. Replacing equipment solely because it has reached a certain age may not always be the most technically or economically appropriate decision.

Remaining Life Assessment, or RLA, helps determine how long an asset may continue to operate under defined conditions. ProSIM focuses on RLA for high-temperature and high-pressure piping systems used in oil, gas, and power generation applications. Its assessment approach combines inspection information, engineering code evaluations, and Finite Element Analysis.

The assessment can consider degradation mechanisms such as corrosion, erosion, and pitting when evaluating the remaining strength and stiffness of affected sections.

Remaining Life Extension, or RLE, can then support decisions about safely extending the operational period of an asset where engineering analysis demonstrates that continued service is appropriate.

The Role of Finite Element Analysis

Finite Element Analysis is a powerful computational method used in structural integrity assessments. It allows engineers to create detailed numerical models and evaluate stresses, deformation, and other structural responses under different load cases.

Complex industrial components may have unusual geometries, localized damage, welds, supports, openings, or connections that require detailed analysis. Advanced FEA can provide a more detailed understanding of how these features affect structural behavior.

ProSIM uses nonlinear FEA, multiphysics modelling, and specialized sub-modeling techniques for structural integrity investigations. Its engineers can combine one-dimensional pipe elements with detailed three-dimensional finite element models to perform more localized stress evaluations.

This type of analysis can be valuable when assessing complex piping systems and localized areas of damage.

Evaluating Corrosion, Erosion and Pitting

Corrosion and erosion are common degradation mechanisms in industrial equipment and piping systems. Material loss can reduce wall thickness and potentially affect the strength of an asset.

A structural integrity assessment can incorporate inspection information to evaluate the severity and location of material loss. Engineers can then determine how the affected section performs under the expected operating loads.

Pitting can be particularly challenging because localized defects may create stress concentrations. Advanced engineering analysis can help determine whether a particular defect is acceptable under the applicable assessment methodology.

Understanding the relationship between current damage and structural capacity is essential for making reliable maintenance and operating decisions.

Fatigue, Creep and Crack Growth

Not all structural damage results from simple material loss. Equipment operating under repeated loads may experience fatigue, while components exposed to elevated temperatures for long periods can experience creep.

The interaction between creep and fatigue can create additional challenges in high-temperature equipment and piping. Crack growth can also become an important consideration when defects are identified during inspection.

ProSIM's structural integrity methodology includes materials and damage modelling for crack propagation, creep, fatigue, and creep-fatigue interaction. Advanced computational methods can be used to investigate how these mechanisms influence the remaining strength and serviceability of an asset.

Engineering Decisions: Repair, Reuse or Retire

One of the most important outcomes of a structural integrity assessment is a practical engineering recommendation.

When an asset shows signs of deterioration, operators may need to decide whether the equipment should be repaired, reused, monitored, or retired. Continuing to operate without adequate assessment can introduce unnecessary risk, while premature replacement can result in significant capital expenditure.

ProSIM provides Engineering Critical Analysis and engineering judgments intended to support repair, reuse, or retirement decisions. The assessment findings can help asset owners understand the technical implications of each option and select an appropriate course of action.

Standards and Engineering Compliance

Structural integrity assessments must be performed using appropriate engineering standards and assessment methodologies. The applicable requirements depend on the equipment, industry, operating conditions, and type of damage being evaluated.

ProSIM states that its structural integrity and remaining life studies incorporate standards and codes including API 579, ASME Boiler and Pressure Vessel Code, DNVGL, IS, and ASME B31.2/B31.3, depending on the application.

Following recognized standards provides a structured basis for evaluating defects, loads, material behavior, and allowable operating conditions.

Applications Across Industrial Sectors

Structural integrity assessment has applications across a wide range of industries. In oil and gas, it can be used for pipelines, piping networks, pressure equipment, and other critical infrastructure. Power generation facilities may require remaining life assessments for high-temperature and high-pressure piping and other equipment.

Offshore facilities face additional challenges because of environmental exposure and difficult maintenance conditions. Thermal and nuclear power facilities also require rigorous engineering evaluation because of the importance of equipment reliability and safety.

ProSIM identifies offshore, oil and gas, thermal power, nuclear power, processing facilities, heavy machinery, static equipment, and complex piping networks among its structural integrity applications.

Digital Transformation in Asset Integrity

Modern asset management is increasingly incorporating digital technologies. Structural integrity programs can benefit from operational data, inspection histories, computational models, and continuous monitoring.

ProSIM states that it assists customers with AI/ML-based Digital Twins, cloud computing, and Industrial Internet of Things technologies Design Optimisation Service as part of the digital transformation of asset management.

These technologies can potentially support more proactive monitoring and provide asset owners with improved visibility into equipment condition and degradation trends.

Conclusion

Structural integrity assessment is an important engineering discipline for organizations operating expensive and safety-critical industrial assets. It provides a technical basis for understanding degradation, evaluating structural capacity, estimating remaining life, and making informed asset management decisions.

Fitness for Service assessments can determine whether damaged equipment remains suitable for operation, while Remaining Life Design Optimisation Service Assessment can help establish the expected service capability of aging assets. Advanced FEA, materials and damage modelling, and Engineering Critical Analysis provide additional technical depth for complex cases.

For industries such as oil and gas, power generation, offshore operations, nuclear energy, and heavy engineering, a comprehensive structural integrity program can support safer operations, reduce the likelihood of unexpected failures, and help organizations make more informed decisions about repair, life extension, monitoring, or replacement.

By combining inspection data with engineering analysis, recognized codes, computational simulation, and materials expertise, structural integrity assessment provides a practical framework for managing industrial assets throughout their operational lifecycle.