Page 97 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Fluid Flow 83

Re - Reynolds Number based on d,
C
an
OX
P74
on
am
OS

PB

011
2 I 6 810. 2 I 6 8 W 2 I 6 010’
Re - Reynolds Number basedon d2

gure 2-18. Flow coefficient “6” for square edged orifices. By permission, Crane Co. [3], Technical Paper 470 Engineering
eir Theory and Appiication Part I, 6th Ed., 1971, American Society of Mechanical Engineers and, Tuve, G. b. and Sprenkle,
scharge Coefficients for Viscous Liquids,” lnstruments Nov. 1933, p. 201.

Estimated flow velocity for assumed 2 in. Sch. 40 pipe (See
4ppendix A-16)
A plant decides to add a nitrogen blanket (at 3 psig) to
a storage tank holding u to 25,000 gallons of a hydro- - (20 gpm ) (8.33 lb / gal) (0.81 SpCr )
-
carbon mixture having kesosen’e-like properties and (62.3X 0.81) (3.353in2 ) (60 sec/min)/l44
pumps this material into a process reactor operating at 30 = 1.91 ft/sec
psig. (See Figure 2-19)
2
Velocity head = = 0.05664 ft of fluid
2g 2(32.2)
The flow rate needs to be 20 gpm. Connections of
pipe and valve are Ranged, with the 6”-90” elbows added 50.6 Q
in the line. Reynoldsnumber = ___ (2 - 49)
dP
50.6 (20)(0.81 X 62.3)
- -
(2.06)(1.125 cp)
Pump suction velocity = 2 ft/sec (Selected low in accordance
with good pump suction practice, Re = 22,036 (turbulent)
from Table 2-4 or Table 2-7). E/D = 0.00088, Figure 2 - 11