Onshore Oil & Gas Engineering Consultants

Maintaining the integrity and performance of ageing infrastructure is essential to the safe and reliable operation of onshore oil and gas facilities. Arthian supports operators with civil and structural inspections, condition assessments, engineering investigations and risk-based maintenance planning to identify deterioration, assess vulnerabilities and prioritise interventions.

Our experience includes major structural inspection and remediation design programmes addressing corrosion beneath passive fire protection (PFP), where concealed deterioration can present significant challenges for asset integrity and long-term structural performance. By assessing the condition of affected steelwork and developing practical repair and remediation solutions, we help operators make informed decisions about maintenance, intervention and asset life extension.

Our wider expertise covers structural steelwork, reinforced concrete, foundations, bridge inspections,pipe supports, bunds and associated infrastructure. We develop practical remedial solutions and maintenance strategies that help operators manage expenditure, minimise operational disruption and extend the useful life of critical assets.

Effective secondary and tertiary containment is essential for protecting the environment and managing major accident risks at refineries, oil storage terminals and other onshore facilities handling hazardous substances.

Arthian provides specialist bund inspections, condition assessments and remediation design, alongside CDOIF Environmental Risk Assessment (ERA), overland hydraulic modelling and containment assessments. Our integrated engineering and environmental expertise helps operators evaluate bund integrity, assess potential loss-of-containment scenarios and understand the risks posed to land, groundwater and surface water.

For COMAH-regulated installations, we support the assessment of environmental risks and the performance of secondary and tertiary containment systems, helping operators identify deficiencies, prioritise improvements and develop practical risk reduction measures.

From inspecting existing bunds and assessing their condition to designing containment upgrades, drainage modifications and remedial works, Arthian helps clients strengthen environmental protection, maintain regulatory compliance and improve the long-term resilience of critical infrastructure.

Refineries, oil storage terminals and other onshore oil and gas facilities operate within complex environmental regulatory frameworks, requiring operators to manage emissions, discharges, waste and environmental performance while maintaining compliance with their permit conditions.

Arthian provides specialist environmental permitting and regulatory consultancy to support new permit applications, permit variations, compliance assessments/audits and ongoing regulatory obligations. Our team helps operators navigate environmental legislation, engage with regulators and manage permitting requirements associated with operational changes, infrastructure upgrades and site development.

From supporting established installations with ongoing compliance to advising on permit requirements for plant modifications and asset life extension projects, we help clients manage regulatory risk, maintain operational continuity and meet their environmental responsibilities.

Decades of industrial activity at refineries, oil terminals and fuel storage facilities can leave complex contamination challenges affecting soil, groundwater and surrounding environments. Understanding and managing these risks is essential for ongoing operations, infrastructure development and the long-term management of site liabilities.

Arthian provides contaminated land investigations, hydrogeological assessments, groundwater monitoring, risk assessments and remediation strategies. Our specialists help operators identify contamination sources, understand potential migration pathways and assess risks to environmental receptors, developing practical solutions appropriate to the site’s operational and regulatory requirements.

Whether supporting operational facilities, brownfield redevelopment or site closure and decommissioning, we help clients manage historic contamination, address emerging environmental issues and make informed decisions about remediation and future land use.

Modifying and upgrading existing oil and gas facilities presents complex engineering challenges, particularly within live operational environments where safety, constructability and minimising disruption are critical considerations.

Arthian provides multidisciplinary engineering support for brownfield projects across refineries, oil terminals, gas processing plants and associated infrastructure. Our civil and structural engineering expertise covers feasibility studies, structural assessments, concept and front-end engineering design (FEED), foundations, pipe supports, structural modifications and infrastructure upgrades.

Drawing on extensive experience in complex industrial environments, our engineers develop practical, buildable solutions that account for existing site constraints, operational interfaces and long-term maintenance requirements. From small-scale plant modifications to major infrastructure improvements, we help operators extend asset life, improve operational performance and deliver investment projects safely and efficiently.

Managing process safety and major accident hazards is fundamental to the safe operation of refineries, oil terminals, gas processing plants and other onshore oil and gas facilities. As infrastructure ages and operational requirements evolve, identifying hazards, assessing risks and maintaining effective control measures remain essential to protecting people, assets and the environment.

Arthian provides specialist process safety consultancy to support hazard identification, risk assessment and regulatory compliance, including DSEAR assessments, hazardous area classification and COMAH-related safety requirements. Our specialists help operators evaluate risks associated with existing operations, plant modifications and infrastructure upgrades, identifying practical measures to strengthen safety and operational resilience.

By integrating process safety expertise with our civil and structural engineering and environmental consultancy capabilities, we provide coordinated support for managing operational risks, improving compliance and making informed decisions throughout the asset lifecycle.