The Alaska pipeline conveys crude oil 800 miles across the state of Alaska from Prudhoe Bay to Valdez. The inside diameter of the pipeline is 48 inches. The pipe wall thickness is of ½ inch of commercial steel and is insulated by an additional ½ inch thickness of rigid foam. Considering the properties of crude oil: a) Calculate the Reynolds number of the oil flow. b) Find the pressure loss per foot length of the pipeline. You may neglect minor losses for this problem. ii) For nominal conditions of -50°F outside air temperature and the cross-wind speed of 12mph c) First find the inside convective heat transfer coefficient
i) The Alaska pipeline conveys crude oil 800 miles across the state of Alaska from Prudhoe Bay to Valdez. The inside diameter of the pipeline is 48 inches. The pipe wall thickness is of ½ inch of commercial steel and is insulated by an additional ½ inch thickness of rigid foam. Considering the properties of crude oil:
a) Calculate the Reynolds number of the oil flow.
b) Find the pressure loss per foot length of the pipeline. You may neglect minor losses for this problem.
ii) For nominal conditions of -50°F outside air temperature and the cross-wind speed of 12mph
c) First find the inside convective heat transfer coefficient (hint: you need to use the second Petukhov equation).
d) Next find the external convective heat transfer coefficient (hint: you need to use Churchill & Bernstein; assume a film temperature of -25°F for air properties).
e) Lastly, neglecting radiation, calculate the heat loss per foot of the pipeline in Btu/hr.
iii)The distance from the last pumping station to the pipeline terminus is 250 miles
f) What is the pump power (in kW) required assuming the pump is 85% efficient.
g) What is the temperature loss (in °F) from the pump station to the terminus.
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