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c. Air Cleaner. Take care that the air cleaner is
Table 2-2. Pump Efficiency at Varying Elevations
operating at its optimum efficiency to allow the engine to
take in as much of the available air as possible. Service
Altitude (ft.)
Percentage of sea
Percentage of sea
level discharge
level head
the air cleaner as necessary (fig. 8-2).
Sea level
100
100
d. Ventilation. Provide an adequate fresh air supply
2000 ft.
97
95
to keep the engine of the pumping unit from
4000 ft.
95
91
overheating.
6000 ft.
93
87
8000 ft.
91
83
10,000 ft.
88
18
2-12
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