Engineering, 13.06.2020 22:57 punkee5375

A single-line steel riser-pipeline system of OD = 7-in is designed for operating pressure of 3000 psig to transport oil (oil = 55 lb/ft3) from a subsea well (at 5000-ft water depth) to a buoyed turret connected to it. It is required to design turret buoyancy tanks volume such that it is 1000-ft below water level when not attached to a vessel. Given the following information: • Seawater density (water = 64 lb/ft3) • Steel density (s = 490 lb/ft3), steel yield strength (65 ksi) • Pipe design SF = 0.6 • Pipe design criteria a = PD/2t, where P is pressure, D ≈ OD, t is wall thickness, a is allowable stress. • Weight of turret and its mooring system Wt ≈ 5000 lb. • Buoyancy force Fb = Volume * water. • Free hanging catenary length ≈ 1.3* water depth • ID = OD-2*t Determine: a) The minimum buoyancy volume required for the turret. b) The required winch tension to bring turret to sea surface while attached to riser-pipeline system.

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A single-line steel riser-pipeline system of OD = 7-in is designed for operating pressure of 3000 ps...

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