To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) 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 (k, = 45 W/m-K) has an inside diameter of D;, 1 150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D;, 2 = 250 mm and wall thickness t, = tj. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.03 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,0 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. -5°C and 0o, 0 (2) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (fa = 10 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.
To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) 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 (k, = 45 W/m-K) has an inside diameter of D;, 1 150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D;, 2 = 250 mm and wall thickness t, = tj. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.03 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,0 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. -5°C and 0o, 0 (2) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (fa = 10 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.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Determine the convection heat transfer resistance on the inside of the pipe per unit length, in m-K/W.
R' 1.conv.i =
m-K/W
i
Transcribed Image Text:To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a
production field.
(1) 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 (k, = 45 W/m-K) has an inside diameter of D;, 1
150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D;, 2 = 250 mm and wall thickness
t, = tj. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.03 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,0
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.
-5°C and
0o, 0
(2) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (fa = 10 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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