The efficiency of an insulation applied to a flowline will define how long a flowline can be. Consider a flowline size of 10" (274 mm OD) will be designed for operation in 2,000 m water depth. Following data are given: Flow rate: 15,000 bbl/day (1 bbl = 0.1589873 m3) Heat capacity: 2,000 J/kg K Density: 850 kg/m3 Wellhead temperature: 12C Hydrate appearance temperature: 3C Seabed temperature: 7C If the allowable flowline distance is 55 km, determine the overall heat transfer coefficient based on outer diameter.