Freese and Nichols provided project management and design for oil and gas production facilities in five states: Texas, Kansas, Oklahoma, Louisiana and Mississippi. Facility design is distinct to each individual field as each varies in capacities and compositions. Typical project management of the wellsite facilities included development of engineering for site layout, mechanical and electrical drawings, as-built drawings and project bid books. Project engineering includes hydraulic modeling for facility piping, control and safety valve sizing and rating, vessel sizing and selection, and process modeling for operational efficiency. Facilities generally include two or three phase separators, heater treaters, fuel gas system, oil and water storage tanks, flares, combustors, facility piping, controls, metering and safety systems. Nonstandard design elements include gathering pipelines, gas compression, vapor recovery units, and natural gas liquid recovery units, dehydration and BTEX (benzene, toluene, ethylbenzene, and xylene) units.