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QP402H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #2 (01/29/14) — PAGE 13
NEVER place the pump on soft soil. The suction hose or
pipe connection should always be checked for tightness
and leaks. A small suction leak in the hose or fittings could
prevent the pump from priming.
Elevation
Higher elevations will effect the performance of the pump.
Due to less atmospheric pressure at higher altitudes,
pumps DO NOT have the priming ability that they have at
sea level. This is due to the “thinner air” or lack of oxygen
at higher altitudes.
A general rule of thumb is that for every 1,000 feet of
elevation above sea level a pump will lose one foot of
priming ability.
For example, in Flagstaff, Arizona where the elevation is
approximately 7,000 feet, the pump would have a suction
lift of only 18 feet rather than the 25 feet at sea level.
Table 3 shows suction lift at various elevations.
Table 3. Suction Lift at Various Elevations
Altitude
Feet
(Meters)
Suction Lift in Feet (Meters)
Sea Level 10.0 (3.048) 15.0 (4.572) 20.0 (6.096) 25.0 (7.620)
2,000 (610) 8.80 (2.680) 13.2 (4.023) 17.6 (5.364) 22.0 (6.705)
4,000 (1,219) 7.80 (2.377) 11.7 (3.566) 15.6 (4.754) 19.5 (5.943)
6,000 (1,829) 6.90 (2.103) 10.4 (3.169) 13.8 (4.206) 17.3 (5.273)
8,000 (2,438) 6.20 (1.889) 9.30 (2.834) 12.4 (3.779) 15.5 (4.724)
10,000 (3,048) 5.70 (1.737) 8.60 (2.621) 11.4 (3.474) 14.3 (4.358)
Table 4 shows percentage drops in performance as
elevation increases.
Table 4. Performance Loss at Various Elevations
Altitude
Feet (Meters)
Discharge Flow Discharge Head
Sea Level 100% 100%
2,000 (610) 97% 95%
4,000 (1,219) 95% 91%
6,000 (1,829) 93% 87%
8,000 (2,438) 91% 83%
10,000 (3,048) 88% 78%
GENERAL INFORMATION
APPLICATION
The QP402H Centrifugal Pump is designed to handle all
types of clear water applications. It is ideal for residential
use such as dewatering basements and swimming pools.
Both the suction and discharge ports on the QP402H pump
use a 3-inch diameter opening, which allows the pump to
pump at a rate of approximately 425 gallons/minute (gpm)
or 1,615 liters/minute (lpm).
Centrifugal or self priming pumps are designed to purge
air from the suction line and create a partial vacuum in the
pump body. The reduced atmospheric pressure inside the
pump allows water to flow through the suction line and into
the pump body. The centrifugal force created by the rotating
impeller pressurizes the water and expels it from the pump.
POWER PLANT
This centrifugal pump is powered by a 7.1 horsepower air
cooled 4-stroke, single cylinder HONDA GX240 gasoline
engine that incorporates a low “Oil Alert Feature.”
OIL ALERT FEATURE
In the event of low oil or no oil, the HONDA GX240 engine
has a built-in oil alarm engine shut-down feature. In the
event the oil level is low the engine will automatically
shutdown.
STANDARD CENTRIFUGAL PUMP
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.
SUCTION LIFT
This pump is intended to be used for de-watering
applications and is capable of suction lifts up to 25 feet
at sea level. For optimal suction lift performance keep the
suction hose or line as short as possible. In general always
place the pump as close to the water as possible.
PUMP SUPPORT
The pump should always be placed on solid stationary
ground in a level position.