Page 215 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Pumping of Liquids 185

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1

L
t Figure 3-400. Pressure head, positive suction. (Adapted by permis-
sion, Centrifugal Pumps Fundamentals, Ingersoll-Rand Co., Wash-
ington, N.J. 07882.)
Figure 3-40A. Static head, overall = H + L.. (Adapted by pennission,
Centrifugal Pumps Fundamentals, Ingersoll-Rand Co., Washington,
N.J. 07882.)

f
H.-

l f

Figure 3-408. Static head, overall = H - S. (Adapted by permission,
Centrifugal Pumps Fundamentals, Ingersoll-Rand Co., Washington,
N.J. 07882.)
Figure 3-40E. Pressure head with negative suction. (Adapted by per-
mission, Centrifugal Pumps Fundamentals, Ingersoll-Rand Co.,
ATMOSPH�AE. Washington, N.J. 07882.)

11
8 CHECK VALVE\
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140' OF
11
The above examples purposely disregarded pressure head, 8 PIPE
friction, entrance, and exit head losses.
1500 GPM CAPACITY
Figure 3-40C. Pressure head. (Adapted by permission, Centrifugal
Pumps Fundamentals, Ingersoll-Rand Co., Washington, N.J. 07882.)

Note that both the discharge and suction pressw·es must
be on the same base/units. These illustrations are for stat-
ic head only, while overall the pump has to work against the Figure 3-40F. Pumping arrangement for Example 3-2. (Adapted by
static and the pressure heads. (To be discussed.) permission, Centrifugal Pumps Fundamentals, Ingersoll-Rand Co.,
Washington, N.J. 07882.)
For Figure 3-40E
Suction static head = -10 ft
Discharge pressure head = 100 psig = 231 ft water * Total suction head = +115 + (-10) = +105 ft
(system fluid) * Total head on pump = 281 - 105 = 176 ft fluid
Discharge static head = 50 ft
Total discharge head = 231 + 50 = 281 ft (*Note Friction Losses Due to Flow
that no flow friction losses
or entrance/exit losses are Friction, entrance and exit heads, valve losses
included in this example)
Suction pressure head +50 psig = + 115 ft water These losses and calculation methods were presented
(system fluid) in Chapter 2. Comments here will be limited. These loss-