(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
1-20
QM5203
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