3.40 WP To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (a) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (ks = 35 W/m · K) has an inside diameter of D;1 = 150 mm and wall thickness t; = 10 mm while the outer steel pipe has an inside diameter of Di2 = 250 mm and wall thickness to = tj. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.075 W/m · K) between the two pipes does not exceed its maximum service temperature of T».max = 70°C. The ocean water is at T.o = -5°C and provides an external convection heat transfer coefficient of ho = 500 W/m2 · K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m2 . K. (b) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (ta = 5 mm) section of polyurethane located at the outside of the inner pipe with an aerogel insulation material (ka = o.012 W/m · K). Determine the maximum allowable crude oil temperature to ensure maximum polyurethane temperatures are below Tp,max = 70°C.
3.40 WP To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (a) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (ks = 35 W/m · K) has an inside diameter of D;1 = 150 mm and wall thickness t; = 10 mm while the outer steel pipe has an inside diameter of Di2 = 250 mm and wall thickness to = tj. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.075 W/m · K) between the two pipes does not exceed its maximum service temperature of T».max = 70°C. The ocean water is at T.o = -5°C and provides an external convection heat transfer coefficient of ho = 500 W/m2 · K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m2 . K. (b) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (ta = 5 mm) section of polyurethane located at the outside of the inner pipe with an aerogel insulation material (ka = o.012 W/m · K). Determine the maximum allowable crude oil temperature to ensure maximum polyurethane temperatures are below Tp,max = 70°C.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:3.40 WP To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production
field.
(a) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to
transport warm crude oil through cold ocean water. The inner steel pipe (ks = 35 W/m · K) has an inside diameter of Di1 = 150 mm and wall thickness
t; = 10 mm while the outer steel pipe has an inside diameter of Di.2 = 250 mm and wall thickness to = t;. Determine the maximum allowable crude oil
temperature to ensure the polyurethane foam insulation (k, = 0.075 W/m K) between the two pipes does not exceed its maximum service
temperature of Tp,max = 70°C. The ocean water is at To,0 = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m² · K.
The convection coefficient associated with the flowing crude oil is h; = 450 W/m2 . K.
(b) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (ta = 5 mm) section of polyurethane located at the outside
of the inner pipe with an aerogel insulation material (ka = 0.012 W/m · K). Determine the maximum allowable crude oil temperature to ensure
maximum polyurethane temperatures are below Tp,max = 70°C.
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