Water supply equipment plays a crucial role in addressing daily water pressure issues. It is essential in many high-rise residential complexes, schools, factories, hotels, inns, and rural areas, where secondary water supply systems are commonly utilized. The choice of water supply equipment varies according to customer requirements, and each manufacturer may have different classification standards for these systems.

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. Water transported through pipes is usually 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 terrains vary, 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, preventing the water from continuing to rise. As a result, many high-rise buildings initiate a secondary water supply system. From which floor does the secondary water supply for high-rise buildings start?

Utilize the existing water pressure in the municipal water pipes, compensating as needed; the equipment stops when the tap water meets the required standard, achieving a 50% reduction. For instance, in a residential complex with a 6-story building, during peak water usage, tap water can reach the 4th floor, and 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 enters sleep mode during off-peak periods. Power outages can restore normal water pressure, consuming less energy and reducing operating costs, making it cost-effective and saving daily electricity expenses.