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INTRODUCTION
The QP205SB centrifugal pump is a self-priming, high-
pressure pump designed to handle all types of clear-water
applications.
The pump's suction port is two inches in diameter. The
three-way discharge outlet consists of two ports that are
1 inch in diameter and a third port that is 1.5 inches in
diameter. This pump can discharge water at a rate of
approximately 106 gallons per minute (gpm) / 401 liters
per minute (lpm).
ENGINE
The QP205SB is powered by a 5.0-horsepower, air-cooled,
four-stroke, single-cylinder, Vanguard 160 gasoline engine.
CENTRIFUGAL PUMPS
Standard centrifugal pumps provide an economical
choice for general purpose dewatering. These types of
pumps should only be used in clear-water applications
(agricultural, industrial, residential), as they have a limited
solid-handling capability of only 10% by volume.
PUMP PRIMING
The pump is self-priming, therefore the pump casing
must be filled with water before the pump is operated.
The engine drives a rotating impeller that creates a partial
vacuum (low pressure) within the pump. The reduced
internal air pressure causes water to flow continuously into
the pump through the suction line, and the centrifugal force
of the impeller expels the water from the pump through the
discharge ports.
NEVER attempt to operate the pump without filling the
casing with water first.
SUCTION LIFT
The QP205SB centrifugal pump has a maximum suction lift
of 25 feet (7.6 meters) at sea level. To obtain the optimum
suction lift, ALWAYS place the pump as close to the water
as possible and use the shortest possible suction line.
QP205SB CENTRIFUGAL PUMP • OPERATION MANUAL — REV. #0 (04/06/23)— PAGE 11
GENERAL INFORMATION
ELEVATION
The elevation at which the pump is operated impacts its
performance. Due to decreased atmospheric pressure at
higher altitudes, the pump's priming ability is reduced as
elevation increases.
Pumps generally lose one foot of priming ability for every
1,000 feet (305 meters) of elevation above sea level.
For example, in Flagstaff, Arizona, where the elevation is
approximately 7,000 feet (2,134 meters) above sea level, a
pump with a suction lift of 25 feet (7.6 meters) at sea level
will have a suction lift of only 18 feet (5.5 meters).
Table 4 shows the difference in suction lift at various
elevations.
Table 4. Suction Lift At Various Elevations
Altitude In Feet
Suction Lift In Feet (Meters)
(Meters)
Sea Level
10 (3.0)
2,000 (609.6)
8.8 (2.7) 13.2 (4.0) 17.6 (5.4)
4,000 (1,219.2)
7.8 (2.4) 11.7 (3.6) 15.6 (4.8) 19.5 (5.9)
6,000 (1,828.8)
6.9 (2.1) 10.4 (3.2) 13.8 (4.2) 17.3 (5.3)
8,000 (2,438.4)
6.2 (1.9)
10,000 (3,048)
5.7 (1.7)
Table 5 shows the loss of performance as elevation
increases.
Table 5. Performance Loss At Various Elevations
Altitude In Feet
Discharge Flow
(Meters)
Sea level
2,000 (609.6)
4,000 (1,219.2)
6,000 (1,828.8)
8,000 (2,438.4)
10,000 (3,048)
ACCESSORIES
Multiquip offers a complete line of fittings, hoses, and
couplers for various pump applications. Contact the
Multiquip Parts Department for more information.
15 (4.6)
20 (6.1)
25 (7.6)
22 (6.7)
9.3 (2.8)
12.4 (3.8) 15.5 (4.7)
8.6 (2.6)
11.4 (3.5) 14.3 (4.4)
Discharge Head
100%
100%
97%
95%
95%
91%
93%
87%
91%
83%
88%
78%
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