Handbook of Civil Engineering Calculations

FIGURE 6. (a) Single-line diagrams for an industrial pipeline; (b) single-line diagram of a

boiler-feed system. (Worthington Corporation.)

when expressing the head in ft (m) of water. A specific gravity less than 1.00 reduces the

total head when expressed in ft (m) of water; whereas a specific gravity greater than 1.00

increases the total head when expressed in ft (m) of water. Note that variations in the suc-

tion and discharge conditions can affect the total head on the pump.

4. Analyze the liquid conditions
   Obtain complete data on the liquid pumped. These data should include the name and
   chemical formula of the liquid, maximum and minimum pumping temperature, corre-
   sponding vapor pressure at these temperatures, specific gravity, viscosity at the pumping
   temperature, pH, flash point, ignition temperature, unusual characteristics (such as ten-
   dency to foam, curd, crystallize, become gelatinous or tacky), solids content, type of
   solids and their size, and variation in the chemical analysis of the liquid.
   Enter the liquid conditions on a pump selection form like that in Fig. 7. Such forms are
   available from many pump manufacturers or can be prepared to meet special job condi-
   tions.

Flood level
elev 543*

Diesel

Motor

Two pumps

Elev 526'

(160.3m)

6 in (152.4 mm) cement-asbestos pipe

Actual internal dia = 5.18 in (131.6 mm)

Factory

lake

Elev 526'

(165.5m)

Transfer pumps

:

Two pumps

Elev 526* (160.3m)

Elev 621

(189.3m) Factorylake

Boiler

Throttle or

regulating

valve

Feedwater

heater

Feed

pump