Choose the right oneSecondary water supply equipmentIt is crucial to ensure the stability and reliability of the water supply system.

The following isSecondary water supply equipmentDetailed data and steps for selection:

1.Determine demand parameters

1.1 Flow (Q)

• definition:Secondary water supply equipmentThe amount of water delivered per unit time.
• unit: Cubic meters per hour (m3/h) or liters per second (L/s).
• Determining method: Determined based on the building’s water needs and design specifications. Generally, the flow rate should meet the water demand at the most unfavorable point.
  • residential building: Usually 10-50 m3/h.
  • commercial building: Usually 30-150 m3/h.
  • industrial facilities: Usually 50-300 m3/h.

1.2 Lift (H)

• definition:Secondary water supply equipmentAble to raise the height of water.
• unit: Meter (m).
• Determining method: Calculated based on the height of the building, the length of the pipe and the resistance loss. The head should include static head (building height) and dynamic head (pipeline resistance loss).
  • Quiet lift: The height of the building.
  • moving lift: The length and resistance loss of the pipeline, usually 10%-20% of the static head.

1.3 Pressure (P)

• definition:Secondary water supply equipmentoutlet water pressure.
• unit: Pascal (Pa) or bar (bar).
• Determining method: Determined based on the design pressure requirements of the water supply system. Normally, the pressure should meet the water pressure demand at the most unfavorable point.
  • residential building: Usually 0.3-0.6 MPa.
  • commercial building: Usually 0.4-0.8 MPa.
  • industrial facilities: Usually 0.5-1.0 MPa.

1.4 Power (P)

• definition:Secondary water supply equipmentMotor power.
• unit: kilowatt (kW).
• Determining method: Calculate the power requirements of the equipment based on flow and head, and select the appropriate motor power.
  • Calculation formula：P = (Q × H) / (102 × η)
    • Q: Flow rate (m3/h)
    • H: Lift (m)
    • eta: efficiency of the equipment (usually 0.6-0.8)

2.Select device type

2.1Frequency conversion constant pressure water supply equipment

• Features: Adjust the motor speed through the frequency converter to achieve constant pressure water supply, with significant energy saving effect.
• Applicable occasions: Suitable for most buildings and industrial facilities, especially where water consumption fluctuates greatly.

2.2No negative pressure water supply equipment

• Features: Use municipal pipe network pressure to avoid negative pressure, save energy and protect the environment.
• Applicable occasions: Suitable for areas with high municipal water supply pressure, especially those with high water quality requirements.

2.3Laminated water supply equipment

• Features:passmultistage pumpSeries connection to achieve high-lift water supply, suitable for high-rise buildings.
• Applicable occasions: Suitable for high-rise buildings and occasions requiring high-lift water supply.

3.Select device material

3.1 Pump body material

• cast iron: Common material, suitable for most occasions.
• Stainless steel: Strong corrosion resistance, suitable for corrosive media and occasions with high hygiene requirements.
• bronze: Good corrosion resistance, suitable for sea water and other corrosive media.

3.2 Impeller material

• cast iron: Common material, suitable for most occasions.
• Stainless steel: Strong corrosion resistance, suitable for corrosive media and occasions with high hygiene requirements.
• bronze: Good corrosion resistance, suitable for sea water and other corrosive media.

4.Select make and model

• Brand selection: Choose well-known brands to ensure product quality and after-sales service.
• Model selection: Select the appropriate model according to the required parameters and equipment type. Refer to the product manuals and technical information provided by the brand.

5.Other considerations

5.1 Operational efficiency

• definition: The energy conversion efficiency of the device.
• Select method: Choose high-efficiency equipment to reduce operating costs.

5.2 Noise and vibration

• definition: Noise and vibration generated when the equipment is running.
• Select method: Choose equipment with low noise and vibration to ensure a comfortable operating environment.

5.3 Maintenance and care

• definition: Maintenance and maintenance needs of equipment.
• Select method: Choose equipment that is easy to maintain and maintain to reduce maintenance costs.

6.Instance selection

Suppose you need to select for a high-rise residential buildingSecondary water supply equipment, the specific requirement parameters are as follows:

• flow：40 m3/h
• Lift:70 meters
• pressure：0.7 MPa
• power: Calculated based on flow rate and head

6.1 Select device type

• Frequency conversion constant pressure water supply equipment: Suitable for high-rise residential buildings, with significant energy saving effect and stable operation.

6.2 Select equipment material

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

6.3 Other considerations

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

Ensure you choose the right one with these detailed selection guides and dataSecondary water supply equipment, thereby effectively meeting the needs of the water supply system and ensuring that it can provide stable and reliable water supply in daily operations.