Multistage centrifugal pumpIt is a type of pump that increases the lift by connecting multiple impellers in series. It is widely used in situations that require high lift, such as water supply for high-rise buildings, boiler water supply, mine drainage, etc.

The following is detailed data and explanations of multi-stage centrifugal pump model descriptions:

1.Multistage centrifugal pumpThe basic structure of

1.1 Pump body

• Material: Cast iron, stainless steel, bronze, etc.
• design: Usually a horizontally split structure for easy maintenance and repair.

1.2 Impeller

• Material: Cast iron, stainless steel, bronze, etc.
• design: Multiple impellers are arranged in series, and each impeller increases a certain lift.

1.3 Pump shaft

• Material: High strength steel or stainless steel.
• Function: Connect the motor and impeller to transmit power.

1.4 Sealing device

• type: Mechanical seal or packing seal.
• Function: Prevent liquid leakage.

1.5 Bearings

• type: Rolling bearing or sliding bearing.
• Function: Supports the pump shaft and reduces friction.

2.Multistage centrifugal pumpworking principle

Multistage centrifugal pumpworking principle andSingle stage centrifugal pumpSimilar, but with multiple impellers connected in series to increase the head. The liquid is sucked in from the first stage impeller, accelerated and pressurized by each stage impeller, and finally reaches the required high lift.

2.1 Liquid enters the pump body

• Water inlet method: Liquid enters the pump body through the inlet pipe, usually through the suction pipe and suction valve.
• Water inlet diameter: Determined based on pump specifications and design requirements.

2.2 Impeller accelerates liquid

• Impeller speed: Typically at 1450 RPM or 2900 RPM (revolutions per minute), depending on pump design and application.
• centrifugal force: The impeller rotates at high speed driven by the motor, and the liquid is accelerated by the centrifugal force.

2.3 Liquid flows to the outside of the pump body

• Runner design: The accelerated liquid flows outward along the flow channel of the impeller and enters the volute part of the pump body.
• Volute design: The design of the volute helps convert the kinetic energy of the liquid into pressure energy.

2.4 Liquid discharged from pump body

• Water outlet method: The liquid is further decelerated in the volute and converted into pressure energy, and is discharged from the pump body through the water outlet pipe.
• Outlet diameter:according topumpspecifications and design requirements.

3.Multistage centrifugal pumpModel description of

Multistage centrifugal pumpThe model number usually consists of a series of letters and numbers, indicating the pump type, flow rate, head, number of stages and other parameters. The following are commonMultistage centrifugal pumpModel description:

3.1 Model examples

Assume aMultistage centrifugal pumpThe model is: D25-50×5

3.2 Model analysis

• D:expressMultistage centrifugal pumptype.
• 25: Indicates the design flow rate of the pump, in cubic meters per hour (m3/h).
• 50: Indicates the single-stage head of the pump, in meters (m).
• ×5: Indicates the number of stages of the pump, that is, the pump has 5 impellers.

4.Multistage centrifugal pumpperformance parameters

4.1 Flow (Q)

• definition:Multistage centrifugal pumpThe amount of liquid delivered per unit time.
• unit: Cubic meters per hour (m3/h) or liters per second (L/s).
• scope: Typically 10-500 m3/h, depending on pump model and application.

4.2 Lift (H)

• definition:Multistage centrifugal pumpAble to raise the height of liquid.
• unit: Meter (m).
• scope: Typically 50-500 meters, depending on pump model and application.

4.3 Power (P)

• definition:Multistage centrifugal pumpMotor power.
• unit: kilowatt (kW).
• Calculation formula：( P = \frac{Q \times H}{102 \times \eta} )
  • (Q): flow rate (m3/h)
  • (H): Lift (m)
  • ( \eta ): efficiency of the pump (usually 0.6-0.8)

4.4 Efficiency (η)

• definition:pumpenergy conversion efficiency.
• unit:percentage(%).
• scope: Typically 60%-85%, depending on pump design and application.

5.Multistage centrifugal pumpApplication occasions

5.1 Water supply for high-rise buildings

• use: Used in water supply systems of high-rise buildings.
• flow: Usually 10-200 m3/h.
• Lift: Usually 50-300 meters.

5.2 Boiler feed water

• use: Used for feed water of boiler system.
• flow: Usually 20-300 m3/h.
• Lift: Usually 100-500 meters.

5.3 Mine drainage

• use: Drainage system for mines.
• flow: Usually 30-500 m3/h.
• Lift: Usually 50-400 meters.

5.4 Industrial processes

• use: Used in various processes in industrial production.
• flow: Usually 10-400 m3/h.
• Lift: Usually 50-350 meters.

6.Multistage centrifugal pumpSelection guide

6.1 Determine demand parameters

• Flow(Q): Determined according to system requirements, the unit is cubic meters per hour (m3/h) or liters per second (L/s).
• Lift(H): Determined according to system requirements, unit is meter (m).
• Power(P): Calculate the power requirement of the pump based on the flow rate and head, in kilowatts (kW).

6.2 Select pump type

• Horizontal multistage centrifugal pump: Suitable for most occasions, easy for maintenance and repair.
• Vertical multistage centrifugal pump: Suitable for occasions with limited space.

6.3 Select pump material

• Pump body material: Cast iron, stainless steel, bronze, etc., selected according to the corrosiveness of the medium.
• Impeller material: Cast iron, stainless steel, bronze, etc., selected according to the corrosiveness of the medium.

7.Instance selection

Suppose you need to select a high-rise buildingMultistage centrifugal pump, the specific requirement parameters are as follows:

• flow：50 m3/h
• Lift:150 meters
• power: Calculated based on flow rate and head

7.1 Select pump type

• Horizontal multistage centrifugal pump: Suitable for water supply in high-rise buildings, easy for maintenance and repair.

7.2 Select pump material

• Pump body material: Cast iron, suitable for most occasions.
• Impeller material: Stainless steel, strong corrosion resistance.

7.3 Select brand and model

• Brand selection: Choose well-known brands to ensure product quality and after-sales service.
• Model selection: Select the appropriate model based on the demand parameters and the product manual provided by the brand.

7.4 Other considerations

• Operational efficiency: Choose a pump with high efficiency to reduce operating costs.
• Noise and vibration: Choose a pump with low noise and vibration to ensure a comfortable operating environment.
• Maintenance and care: Choose a pump that is easy to maintain and maintain to reduce maintenance costs.

Ensure you choose the right one with these detailed model descriptions and selection guidesMultistage centrifugal pump, thereby effectively meeting the high lift requirements and ensuring that it can work stably and reliably in daily operations.