Pressure drop due to pipe fittings can be estimated by the equation, ?P/? = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45 elbow and 180 close return bends would be respectively around______________________?

A. 5 and 10

B. 180 and 300

C. 300 and 500

D. 45 and 75
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