OLGA is used in feasibility studies, conceptual studies, FEED and detailed designs and is essential for defining operating procedures and control schemes. Application examples: Transient thermohydraulics during start-up/shut-in Optimal design for maximum operating envelope Process and control system design Flow assurance, investigating hydrates, wax, asphaltenes, corrosion, emulsions, scale and sand Liquid inventory during pigging and rate changes Slug mitigation and control Fluid systems that can be modelled: Oil and natural gas flowlines Wet gas and condensate flowlines Wellstream fluids Dense phase flowlines Single phase gas or liquid flowlines Laboratory experiments Full network capability OLGA has full network capability, allowing for definition of converging and diverging transport and process networks as well as closed loops. This flexibility enables the engineers to simulate a set of applications such as well and pipeline networks, gas lift and complete process systems. OLGA for life-cycle simulations Dynamic modelling provides key design requirements and is essential for maximizing the production window. Assuring stable production (flow assurance) throughout the field life is the main focus for detailed analysis with OLGA. Conceptual–FEED- Detailed Design Design Pipeline sizes Thermal insulation Hydrate/Inhibitor Liquid management/Pigging Slug mitigation Process capacity (integrated simulation) Focus maximizing production window Initial Mid field life Tail end Preparing for Operations Basis for operational procedures Operational procedures and limits Emergency procedures Contingency plans Operator training Training in flow assurance Practicing operational procedures Preparing initial start up