APTEC performs basic/ conceptual engineering services as required. These services generally comprise: site investigations/ data collection, review of data and documentation, preparation of design basis manual, process simulations and calculations, equipment sizing, process flow diagrams, single line diagrams, plant sitting, selection of routes for pipelines , typical/ standard designs, long lead items of equipment, ROW documentation, identification of interfaces, cost estimates, various reviews such as design, construct ability and HAZOP, cost estimates.