Actemium UK provides engineering assurance and substantiation for existing assets, plant modifications, and new designs. Our work is undertaken by Suitably Qualified and Experienced Personnel (SQEP) with extensive design and operational plant experience.

We combine plant knowledge, engineering analysis and applicable standards to help you understand asset condition, identify engineering shortfalls, and make informed, defensible decisions about safety, compliance, and asset integrity.

Key customer benefits

  • Confidence engineering
    Confidence in asset integrity
  • Risk Attention
    Clearer understanding of engineering risk
  • Engineering
    Rubust engineering justification
  • Compliance assurance
    Greater confidence in compliance
  • Track Record
    Better informed asset decisions

Our engineering assurance & substantiation capabilities

Our Suitably Qualified and Experienced Personnel (SQEP) engineering teams can support:

  • Safety functions & asset assessment

    • Safety function identification and assessment
    • Structures, Systems and Components (SSC) assessment
    • Safety case requirements
    • Plant surveys and condition assessments
    • Engineering schedule reviews

  • Hazard & compliance assessment

    • HAZOP and HAZAN studies
    • Assessment against applicable legislation
    • Assessment against modern standards and good practice
    • Identification and assessment of engineering shortfalls

  • Engineering substantiation & documentation

    • Design Substantiation Reports
    • Design Justification Reports
    • Design Assessment Reports
    • Supporting engineering calculations and documentation

From plant assessment to engineering evidence

Engineering substantiation starts with understanding the asset, its required functions, and the conditions under which it needs to perform.

Our engineers can review existing plant information, undertake surveys, and assess structures, systems, and components against their required safety functions. Relevant operating conditions, fault scenarios, maintenance requirements, engineering standards, and safety case requirements can then be considered as part of the assessment.

Where potential shortfalls are identified, we assess their engineering significance and develop the evidence needed to support an appropriate course of action.

This can include engineering calculations, specialist stress analysis and FEA, design assessments, and formal substantiation documentation.

The result is a structured engineering basis that helps customers understand what they have, whether it remains fit for its required function and what action may be needed next.

Reduce uncertainty and strengthen compliance

Existing assets can present assurance challenges. Original design information may be incomplete, requirements may have changed and equipment may be operating beyond its original intended lifecycle.

Our approach combines operational plant experience with engineering evidence and applicable standards to establish a clearer understanding of asset condition and engineering risk.

For new designs and modifications, assurance can also be incorporated earlier in the engineering lifecycle, helping ensure substantiation requirements are considered during design rather than addressed retrospectively.

This helps reduce uncertainty, support compliance, and provide greater confidence in the continued safe operation or modification of critical assets.

Engineering expertise you can rely on

  • Accredited
    SQEP-led engineering

    Engineering substantiation undertaken by Suitably Qualified and Experienced Personnel with backgrounds in design and operational plant environments.
  • Safety Critical
    Safety-critical experience

    Expertise supporting assets where safety functions, fault conditions, compliance, and engineering integrity require robust substantiation.
  • Multidisciplinary capability

    Access mechanical, process, piping, CE&I, stress analysis, and specialist engineering expertise to support the evidence required.
  • Lifecycle
    Engineering throughout the asset lifecycle

    Support for existing assets, modifications, and new designs, helping customers understand condition, demonstrate integrity, and make informed decisions about future requirements.

Proven in demanding environments

Engineering Assurance & Substantiation FAQs

  • What is engineering substantiation?

    Engineering substantiation is the process of developing and documenting evidence that a structure, system, or component can perform its required function under defined operating, fault, and environmental conditions. This can involve plant assessment, engineering analysis, calculations and review against applicable requirements and standards.

  • When is engineering substantiation required?

    Substantiation may be required for existing assets, plant modifications, or new designs where evidence is needed to demonstrate engineering integrity or required safety functions. It can also help when asset condition, ageing, changing requirements, or incomplete design information creates uncertainty.

  • What are Structures, Systems and Components (SSCs)?

    Structures, Systems and Components are the plant, equipment and systems that contribute to the operation and safety of a facility. Engineering substantiation can assess whether relevant SSCs can perform their required functions.

  • Can Actemium UK substantiate existing assets?

    Yes. Our engineers can support plant surveys, condition assessments, and engineering reviews of existing assets, including identifying engineering shortfalls and developing supporting calculations and substantiation documentation.

  • What engineering substantiation documentation can Actemium UK provide?

    Our capability includes Design Substantiation Reports, Design Justification Reports, Design Assessment Reports and supporting engineering calculations and documentation. The specific documentation required will depend on the asset, project, and applicable requirements.

  • Can stress analysis and FEA support engineering substantiation?

    Yes. Where required, stress analysis and Finite Element Analysis can provide specialist engineering evidence to assess structural or mechanical performance and support the wider substantiation case.

More ways we can support your project

Need to substantiate a safety-critical design or existing asset?

Contact our engineering assurance team