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Engineering Consultancy and Design

Process Safety, Engineering and Environment

Whatever your Process Safety needs, we have the technical skills and breadth of experience to support your business. Whether you are carrying out a safety review, implementing safety audits or ensuring compliance with standards or regulations, we have the up-to-date resources and skills to complete the task. If you require help with problem solving or incident investigation, you can rely on impartial advice and support from our experienced team whenever you need it.

Most importantly, our team is your team. Our consultancy services can be built around your precise business needs; whether adding to your capabilities or supporting you on a short, medium, or long-term basis through our partnership programmes.


Our Process Safety Engineering services include:

  • Safety studies
  • Audits and Assessments
  • Call-off Support
  • Incident Investigation
  • Regulatory Compliance (ATEX/ DSEAR, PFEER, COMAH/ SEVESO III, OSC)
  • HAZOP Studies
  • HAZAN Studies
  • SIL targeting
  • SIL Assessment to BS EN 61508 and BS EN 61511
  • Quantified Risk Assessment
  • Dispersion Modelling using DNV PHAST

More recently, we now use AFT Fathom and Arrow, a fluid dynamic simulation tool used to calculate pressure drop and flow distribution in gas piping and ducting systems.

We also use Honeywell Forge Process Simulation also known as UniSim Design, a multi-purpose process simulation solution for process design, simulation, safety studies, operations monitoring and debottlenecking, digital twins, process optimisation and business planning.

Electrical, Control Systems & Instrumentation

Our electrical engineering consultants provide professional electrical engineering services, with specialist expertise in power generation and distribution systems. Typical of our full-service portfolio, this includes specialist consultancy services and studies, feasibility, and detailed design through to procurement, installation supervision, and commissioning.

Our electrical engineering services include:

  • Arc flash studies
  • Fault level studies and analysis
  • Short circuit analysis
  • Protection co-ordination
  • Load flow studies
  • Earthing studies
  • Lightning protection studies
  • Lighting design
  • LV design within hazardous areas
  • MCC design and specification
  • 2D/3D modelling of routing of cables and infrastructure
  • Panel design
  • Electrical standards development and implementation on site
  • FAT/SAT management and support

Control System Design

Our control system engineering consultants provide professional control system engineering services, with experience in integration into existing systems, to new systems and migration projects.

We have experience in network and panel design across the following controls system platforms:

  • ABB 800xa
  • Emerson DeltaV
  • Siemens PCS7
  • Allen-Bradley
  • Schneider Triconex
  • Hima Sella

Our control system services include:

  • Feasibility studies
  • Functional design specifications/cause and effect diagrams
  • Control system selection analysis
  • Control room design
  • Fibre optics networking and routing
  • Profibus network design
  • Profinet network design
  • Modbus network design
  • Foundation fieldbus design
  • Control panel design
  • FAT/SAT management and support

Functional Safety

Our functional safety engineering consultants provide professional functional safety engineering services, with experience in auditing, planning, design, and lifecycle management all in accordance with BS EN 61508/11.

Our capabilities include:

  • Functional safety planning
  • Development and management of functional safety management systems
  • Safety requirements specification (SRS) generation
  • SIS/SIF design via hardware trip and integration into safety PLCs/ICSSs
  • Proof test procedure generation
  • Functional safety assessments (FSAs)
  • System reliability/availability studies
  • Audits of procedures and techniques
  • General reliability studies including reliability centred maintenance
  • Consequence analysis
  • FAT/SAT management and support

Instrumented System Design

Our instrumentation engineering consultants are skilled in providing professional services across the full project lifecycle. Experienced in the implementation of measurement systems including temperature, pressure, flow, level, weight, in-line analytical and fire & gas detection systems.

Typical services include:

  • Instrument and actuated valve specification
  • Instrument design within hazardous areas using a variety of protection concepts
  • I.S. calculations/descriptive system documents
  • Feasibility/front end engineering design studies
  • Control panel design
  • 2D/3D modelling of infrastructure and cables routes
  • On site fault finding/instrument selection issue reviews
  • On site commissioning support
  • Supervision of installation and commissioning
  • Vendor design integration
  • FAT/SAT management and support

Mechanical, Piping, Vessel & Stress

With our experience in design consultancy, we are well aware of the multiple targets a designer has to meet during the development process. We have a proven track record in providing efficient and practical solutions to optimise any design with respect to crucial design criteria such as strength, reliability, simplicity, weight and cost.  With our background in CAD modelling as the foundation, we have over 20 years’ experience in the area of stress analysis and FEA modelling.

Within our Piping, Vessel and Stress departments we utilise industry standard software packages in delivering solutions and analysing problems:

  • Static Stress
  • Fatigue and Life Prediction
  • Pressure Vessel Design
  • Pipework Stressing
  • Steel Structures
  • Composite Materials
  • Contact Situations
  • Dynamic Analysis
  • Vibration and Resonance
  • Shock and Impact
  • Seismic Loads
  • Non-Linear Stress
  • Drop Test Simulation
  • Snap-Fit Assemblies
  • Heat Transfer
  • Thermal Stresses
  • Fluid Dynamics
  • Air Flow in Compartments
  • Free and Forced Convection

We also utilise the following software to ensure all work meets the high standards we set ourselves:

  1. AutoCAD Plant 3D – Integrated 3D plant design engineering CAD software tools for the design and modelling of process, power, industrial, and manufacturing facilities.
  2. CAESAR II evaluates the structural responses and stresses of piping systems to international codes and standards.
  3. FE/Pipe is a complete and full-featured FEA package for the pressure vessel and piping systems. It allows On Line Design to analyse individual or multi-component geometries to consider the interaction between multiple nozzles, saddles, clips, lugs, bends, etc.
  4. NozzlePRO is a single-component analysis tool for piping and pressure vessels.  Analyse individual nozzles, clips, lugs or saddles.
  5. PV Elite performs calculations in accordance with ASME Section VIII Divisions 1 & 2, PD 5500 and EN 13445. Rules from API579 (Fitness for Service) are also included for evaluating the current state and remaining life of existing vessels.
  6. Finglow, Engineering Software for the Design of Pressure Vessels and Heat accordance with all the leading international codes of practice, including ASME VIII Divisions 1 & 2, PD 5500,  Stoomwezen and EN 13445.
  7. Navisworks – used for model simulations and model reviews.

Civil and Structural Design

OLG’s expertise ranges from complex moving structures to the smallest of car parks, if you want a 50m high process tower or a 15m deep sheet piled temporary works pit, we have delivered it, successfully. In the centre of London, or in the middle of the North Sea, our engineers have the experience, competence, and the understanding of not only the technicalities of the design solution, but the logistics of the build and the requirements of the end user.

We ensure the continued professional development of all our team from our apprentices to our Chartered Engineers and we utilise the tools to ensure that we can design efficiently and effectively whilst adding value.

We utilise the full Autodesk AEC collection, from Civils 3D and Revit on our building and civils work to Advanced Steel for our structural modelling and fabrication detailing. Using Tekla Building Designer, StaadPro and Tedds amongst numerous other design & analysis packages, OLG Engineering design to various levels of detail from concept and FEED through to Construction detail, but we will always step back and if required undertake some basic manual checks from first principles.

That understanding of the required level of detail transfers into our fully federated inter-discipline models, we can walk our clients through their project every step of the way. But we don’t just rely on digital engineering, with our co-ordinated laser scans, we undertake basic checks using our experience, blending modern technology with good old-fashioned engineering. We will walk the project with all stakeholders, enabling the design to become a fully collaborative effort, designing what our clients need, which might not even be what they think they want and certainly won’t be something OLG can re-badge from a similar project.

It goes without saying that we can undertake the Principal Designer role to cover CDM Regulations, undertake structural inspections or help get you through planning and building control, but we thought we would mention it anyway; if it involves Civil & Structural engineering, anywhere, we have it covered for you.

Get in touch with our team today!

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