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The QP3TB series trash pump is a self-priming pump
powered by a 10.0-horsepower, air-cooled, four-stroke,
single-cylinder, Vanguard gasoline engine. The pump's
suction and discharge ports are three inches in diameter,
enabling a discharge rate of approximately 396 gallons per
minute (gpm) / 1,500 liters per minute (lpm).
TRASH PUMPS
Trash pumps derive their name from their ability to handle
a greater amount of solid debris than standard centrifugal
pumps. Trash pumps are unlikely to clog, as they can
handle water containing 25% solids by weight, and can
accomodate solids up to one-half the size of the discharge
opening. If the pump does become clogged, it can be
disassembled quickly without the use of tools to allow for
debris removal.
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 QP3TB trash 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.
QP3TB TRASH PUMP • OPERATION MANUAL — REV. #0 (12/08/22)— 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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