1 hp Horizontal Centrifugal Pump

1 hp horizontal centrifugal pump is a 3 phase centrifugal water pump, has optional input voltage AC 220V/380V to 480V, optional input frequency 50Hz/60Hz, maximum flow 5.2m3/h (22.9 gpm), maximum head 20.6m (68ft) and same diameter of inlet and outlet 25mm (1 inch). 1 hp stainless steel centrifugal pump with low price can be used in industrial and city water supply, such as cooling tower water feeding, high-rise building pressurized water supply, etc.
Delivery date: 6-20 days
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1 hp horizontal centrifugal pump with 5.2m3/h maximum flow, 20.6m maximum head and 25mm diameter of inlet and outlet.


  1. The centrifugal pump has the horizontal structure. The diameter of the inlet and outlet are the same. If a protective cover is added, it can be used in the open air.
  2. It is easy to install and maintain. No need to dismantle pipeline system, just lifting off the conjunction flat nut of vertical pump. Then all the rotor parts can be taken out.
  3. Horizontal centrifugal pump can be operating in series and parallel connection according to the requirements of flow and head.
  4. The installation angle of pump outlet can be 0°, 90° and 180° to meet different connection occasions.


Model 25-125
Weight 28kg
Size 330*400*200mm
Power 1 hp (0.75kW)
Phase 3 phase
Input voltage * AC 220V, 230V, 240V, 380V, 400V, 415V, 440V, 460V, 480V
Input frequency * 50Hz, 60Hz
Flow (min. flow to max. flow) 2.8m3/h (12.3 gpm, American system) 4.0m3/h (17.6 gpm, American system) 5.2m3/h (22.9 gpm, American system)
Head (max. head to min. head) 20.6m (68ft) 20.0m (66ft) 18.0m (59ft)
Efficiency 28% 36% 35%
Inlet diameter 25mm (1 inch)
Outlet diameter 25mm (1 inch)
Installation angle of outlet 0°, 90° and 180°
Nominal diameter of impeller 125mm
Pump type Booster pump
Number of stages Single stage
Motor type Y/Y2 series motor
Motor speed 2900rpm
Impeller material 304/316 stainless steel
Seal material 304 stainless steel, tungsten carbide, fluorine rubber
Inlet max. pressure 1MPa (145 psi)
(NPSH)r 2.3m
Usage Water, or liquids compatible with pump component materials.
1. The volume of solid particles should be less than 0.1% in unit volume, and the granularity should be less than 0.2mm.
2. The temperature should be lower than 60℃.
Environment Temperature: <40℃, humidity: <95%, altitude<1000m
Warranty 12 months

Horizontal centrifugal pump dimension (unit: mm):

Boundary dimension Base dimension Flange dimension
h H L a A L1 B l b h1 4-Φd1 D D1 n-Φd
190 330 400 80 55 320 200 270 100 80 4-Φ14 Φ115 Φ85 4-Φ14

1 hp horizontal centrifugal pump dimensional drawing
Tips: The working principle of centrifugal pump
Before start-up centrifugal pump, it is firstly required to fill the pump casing and inlet line from the funnel with liquid. When the impeller rotates rapidly, the liquid in the impeller rotates as well under the driving force of the impeller blade, so that the liquid obtains centrifugal force and moves outward from the center of the impeller along the vane flow passage. Afterwards, it is tossed out of the end of the blade, and thrown into the volute or diffusion pipe of the pumping shell (or guide wheel). When the liquid flows to the diffusion tube, the flow speed slows down because the sectional area of the liquid flow expands gradually, and a part of the kinetic energy is converted into a static energy head, the pressure is raised, and eventually pushed out of the discharge tube. At the same time, a partial vacuum is generated at the center of the impeller because the liquid is thrown away, so that the liquid in the sump is continuously sucked into the pump from the source of the suction pipe under the action of the liquid surface pressure. The impeller keeps on rotating, and the liquid is continuously sent from the suction tank to the high level tank or pressure vessel.
The principle that a centrifugal pump can transport liquid is that a high-speed rotating impeller exerts a centrifugal force to the liquid. That’s why it is called a centrifugal pump.

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