(3) Re vs Flow type: Remember the different types of flow. Always maintain

turbulent flow within a multiproduct pipeline.

Reynold's Number Flow Type

0 <Re<2000 Laminar

2000 <Re<4000 Transitional

4000 < Re

Turbulent (Preferred in military pipelines)

PROBLEM: Given: V = 3.7 mile/hr

ID = 6.145 in

Y = 0.08 ft2/min

Calculate Re, and determine the flow type.

SOLUTION:

V = 3.7 mile/hr x 5280 ft/mile x 1 hr/3600sec = 5.43 ft/sec

ID = 6.145 in x 1ft/12in = 0.512 ft

Y = 0.08 ft2/min x 1min/60sec = 0.0013 ft2/sec

Re = 5.43 x 0.512 = 2,138 (TRANSITIONAL)

0.0013

PROBLEM: Given: V = 5 mile/hr

ID = 8.145 in

Y= 12 ft2/min

Calculate Re, and determine the flow type.

SOLUTION:

V = 5 mile/hr x 5280 ft/mile x 1 hr/3600 sec = 7.33 ft/sec

ID = 8.145 in x 1ft/12in = 0.679 ft

Y = 12ft2/min x 1min/60sec = 0.2 ft2/sec

Re= 7.33 x .678 = 24.8 (Laminar)

.2

PROBLEM: Given: Q = 500 BPH

ID = 6 in

K = 42 cSt

Calculate Re, and determine the flow type.

SOLUTION:

Q = 500 x 42/60 = 350 GPM

Re = 3160 x 350 = 4,389 (Turbulent)

6 x 42

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QM5203

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