Pipe Stress Analysis
Resolv Engineering provides pipe stress analysis services in the UK for pipelines and pipework modifications. We deliver CAESAR II whole-system stress analysis and Abaqus finite element assessments in accordance with IGEM/TD/12, IGEM/TD/1, PD 8010, and ASME B31.3 / B31.4 / B31.8 / B31.12 (Hydrogen), supported by clear technical reporting and practical engineering recommendations.
Approvals and appraisal
Our engineers support pipe stress analysis for gas transmission and distribution projects, including assessments associated with appraisal, approvals, and management procedures. We understand the requirements of brownfield modifications, new pipework, and projects where stress, flexibility, localised loading, or code compliance require detailed engineering assessment.
Our engineers are CDA-certified Approvers and Appraisers, with experience supporting UK gas industry approval, appraisal and management procedures, including T/PM/G/35, GD/PM/G/17, NGN/PM/G/17, SGN/PM/PS/5 and IGEM/GL/5.
Analysis approach
We select the analysis method to suit the scope of work and the applicable design code. Whole-system stress assessments are typically undertaken in CAESAR II, with local finite element analysis in Abaqus used where more detailed assessment is required.
Typical scope
Our work includes sustained, thermal, occasional and fatigue assessment, support and restraint load checks, dynamic and seismic studies, slug flow loading, and local assessment of branch connections, nozzles and other geometric discontinuities.
FEA and code stress exceptions
Where a project identifies a potential over stresses, or where a component falls outside the scope of beam modelling alone, we undertake local FEA to assess the detail in more depth and provide practical engineering recommendations.
If you require pipe stress analysis for a pipeline or pipework modification, contact Resolv Engineering to discuss your project.
Managing Existing IGEM/TD/12 Code Stress Exceptions
When it comes to managing pre-existing pipework stress exceptions, cost-effective solutions can make a big difference. Here are three proven approaches to address pre-existing IGEM/TD/12 code stress exceptions without costly site outages and premature replacement of piping components. Click here, or on the image below, to find out more.
Pipe Stress Analysis - FAQs
When is a pipe stress analysis required?
Pipe stress analysis is typically required for new pipework systems, modifications to existing installations, buried or above-ground pipelines, branch connections, high-temperature systems, and any arrangement where thermal movement, support loads, settlement, vibration or code compliance needs to be assessed.
What codes and standards do you work to?
Assessments are undertaken in accordance with the applicable project requirements, including IGEM/TD/12, IGEM/TD/1, IGEM/TD/13, PD 8010 and ASME B31, including hydrogen applications where relevant.
What software do you use?
Whole-system stress assessments are typically undertaken in CAESAR II, with local finite element analysis carried out in Abaqus where more detailed assessment is required.
When is local FEA required?
Local FEA is typically used where beam modelling alone is not sufficient, such as for branch connections, nozzles, local discontinuities, complex geometries, or where a potential code stress exception requires more detailed assessment.
Can you help with existing code stress exceptions?
Yes. We regularly assess existing pipework stress exceptions and provide practical recommendations to support continued operation, modification works or more detailed review where required.
Do you support G/35 and related approval processes?
Yes. Our engineers are CDA-certified Approvers and Appraisers, with experience supporting UK gas industry approval, appraisal and management procedures, including T/PM/G/35, GD/PM/G/17, NGN/PM/G/17, SGN/PM/PS/5 and IGEM/GL/5.
Do you work on hydrogen projects?
Yes. We undertake pipe stress analysis for hydrogen projects, including new installations, modifications to existing assets, and hydrogen repurposing studies, in accordance with the applicable project requirements, including IGEM/TD/13 and ASME B31.12 where relevant.
Why choose Resolv?
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Specialist pipe stress analysis for pipeline and pipework projects
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Experience with CAESAR II whole-system modelling and Abaqus local FEA
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Assessments aligned with IGEM/TD/12, PD 8010, and ASME B31 requirements
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Clear, practical outputs to support design decisions and project delivery
Overview
A pipe stress analysis was conducted to ensure compliance with IGEM/TD/12 and industry standards for a new preheat installation. The assessment evaluated stress levels, fatigue life, and structural integrity under various loading conditions.
Key Findings
Thermal Expansion Concerns: Identified in the expansion loop, requiring mitigation to prevent excessive stress buildup.
Weldoflange Stress Exceptions: Initial stress analysis using CAESAR II software highlighted sustained and shakedown stress issues, particularly due to material variability in the 600NB pipeline (Grade B from Q/10 sampling).
Recommended Solution
Engineered Backfill: Proposed to allow unrestrained thermal expansion and contraction, reducing stress concentrations.
Finite Element Analysis (FEA): A detailed FEA was conducted using ABAQUS in accordance with IGEM/TD/12 Design-By-Analysis (DBA) methodology to address the Weldoflange stress exceptions.
Conclusion
The design meets all required standards and is structurally sound. Engineering backfill will prevent stress-related failures and ensure long-term reliability.The use of advanced FEA provided critical insights into stress distribution, ensuring compliance with safety and operational standards.