They oversee the design and operation of pipelines. They also assist in the repair of faulty or damaged pipelines. Pipeline engineers typically work in the oil and gas industry. They act as project managers, designers, and safety inspectors.The Mechanical Piping Engineer's primary role is to ensure that engineering design, procurement, construction, and project completion is done in compliance with the project contract requirements, i.e., project schedule, cost, HSE, and company standards and procedures.