Water supply equipment plays a crucial role in addressing the pressure issues of daily life water supply. It is required in many high-rise residential areas, schools, factories, hotels, inns, and rural areas, among others. The choice of water supply equipment varies according to customer needs, and each manufacturer has different standards for classifying such equipment.

I believe many of you are familiar with secondary water supply! The tap water we use in our daily lives is transported to our homes through pipes. The water transported through pipes is generally under pressure; when tap water leaves the waterworks, it is pressurized to 0.38 MPa, which can lift the water to a height of 38 meters. Therefore, for floors below this height, theoretically, the water from the waterworks can directly flow into residential homes through the pipes.

But some terrain varies, and as the distance the tap water travels through the pipes increases, the resistance also grows, and the achievable height decreases accordingly. Therefore, this 38-meter height line is not parallel to the ground. However, some buildings have floors that are too high, which can lead to insufficient water pressure and prevent the water from continuing to rise. That's why many high-rise buildings initiate secondary water supply. From which floor does the secondary water supply for high-rise buildings start?

Utilize the existing pressure in the potable water pipeline, adding only as much pressure as needed. The equipment stops working once the potable water meets the required standards, achieving a pressure increase of up to 50%. For instance, in a residential complex with a 6-story building, during peak water usage, the potable water can reach the 4th floor, while during off-peak usage, it can reach the 6th floor. The variable frequency constant pressure water supply equipment boosts pressure to the 5-6th floors during peak usage and goes into sleep mode during off-peak periods. Power outages can restore normal water pressure supply, consuming less energy and keeping operational costs low, making it economical and saving daily electricity expenses.