TM 10-4320-303-13
Figure 2-9. Pump spacing Triangle.
b. Divide vertical, left-hand edge of pump spacing triangle into spaces on the same uniform scale used
to represent elevation changes on ground profile graph. Mark off spaces along vertical side of pump
spacing triangle as follows:
(1) Zero represents pumping station elevation.
(2) The upper left-hand corner represents 300 feet above pumping station.
(3) The lower left-hand corner represents 600 feet below pumping station.
c. Draw a straight, diagonal line from the 300 feet mark on the vertical scale to the 39,000 feet mark on
the horizontal scale. This line will form the hypotenuse or long side of the triangle.
d. Making sure all lines have a straight edge, cut the triangle along the three sides drawn (horizontal,
vertical, and diagonal).
2.3.1.7 Determining Location of First Boost Pumping Station . Using ground profile graph and pump
spacing triangle, refer to figure 2-10 and determine first boost pumping station as follows:
a. Place pump spacing triangle on ground profile graph.
b. Align vertical side of pump spacing triangle with vertical (elevation) side of ground profile graph.
Ensure zero mark of pump spacing triangle is on lead pumping station mark of ground profile graph.
c. Ensure horizontal side of spacing triangle is exactly parallel with horizontal base of ground profile
graph. Horizontal space on both the pump spacing triangle and ground profile graph should be exactly
aligned.
NOTE
If level of ground profile is below base of pump spacing triangle, extend pump
spacing triangle hypotenuse line until it crosses the ground profile.
d. Mark point at which the hypotenuse (long side of pump spacing triangle) crosses ground profile. This
will be the first boost pumping station location.
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