profile starting at 200 feet elevation on the left and ending at 1400 feet

elevation on the right.

the chart, multiply 97 ft/mi by 10 miles = 970 ft. Locate 10 miles on the

bottom horizontal axis and 970 ft on the left vertical axis. Draw a

straight line between the two; this establishes the slope of the Hg. Find

the total head for a 6 inch pipeline 1362 ft/hd (Figure 3-2). Using the

hydraulic gradient as a guide, draw a parallel line from 1662 ft/hd down to

the pipeline trace at 950 ft/hd at 7.5 miles. This is your True Gradient.

From the True Gradient back up 64 ft of head to meet the minimum requirement

of 20 psi at each pump station. Using the hydraulic gradient as a guide,

draw a parallel line from 1598 ft/hd down to the pipeline trace at 900 ft/hd

at mile 7. This is your Design Gradient. We will locate pump station 2 at

this point. At pump station 2, draw a vertical line up 1362 ft/hd, now draw

a parallel line down to the pipeline trace at mile 22.75 and 810 ft

elevation. This is the location of pump station number 3. Simply continue

this procedure to place the remaining pump stations. The end of the profile

is the Head Terminal (HT). From pump station 4, you can see that the line

does not come in contact with the pipeline trace, at this point there is a

terminal and the fuel will enter the terminal at 1190 ft/hd or 373 psi. Use

the formula shown below.

Where:

P = pressure, in psi

H = head, in feet

SG = specific gravity

or

2.31

and

or

0.433

Figure 3-2

Operating characteristics of standard pipeline pumping stations

12-31

QM 5099

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