Multistage pump elevation adjustment and initial level
1) Elevation adjustment The relative height difference (positive or negative value) between the measurement site and the elevation reference point (commonly known as zero) is called the elevation at that location. The elevation is divided into absolute elevation and relative elevation. The absolute elevation is the sea level as the reference zero point, the height difference from the sea level is called the absolute elevation; the relative elevation is the elevation of the reference point of a certain height, and the height difference from the reference point is called the relative elevation value. The project mainly uses the relative elevation, which is customarily called the elevation. The adjustment of the multi-stage pump elevation is to facilitate the connection between the pump body and the pipeline. Under normal circumstances, the elevation of the pump is measured by the pump shaft line, and the base elevation marked on the pump base is used as the measurement reference, and the measurement is performed by the liquid level connector. . For more demanding pumps, the elevation adjustment is measured by a water level gauge, and the deviation can be adjusted by a temporary horn.
2) Initial level of finding The initial level of multi-stage pump can be found after the elevation is found, or at the same time. It adjusts the level by adjusting the height of the temporary horn. The level adjustment of the multi-stage pump is applied to a level with a precision of 0.02 mm/m or a level with an accuracy of 0.05 mm/m, and is placed on the inlet and outlet flange faces of the pump or on the pump shaft for measurement. For horizontally split pumps, the level can be measured on the horizontal mid-section or on the pump shaft and inlet and outlet flange faces. Centrifugal pump horizontal tolerance: For the whole installation, the longitudinal horizontal deviation should not be greater than 0.1/1000, the horizontal horizontal deviation should not be greater than 0.2/1000; for the disassembled pump, the longitudinal and lateral horizontal deviations are not greater than 0.05/1 .
Multistage pump positioning and correction
The positioning and alignment of the multi-stage pump is to place the pump on the foundation and adjust the longitudinal and transverse center line positions of the pump body according to the center line of the foundation to make it meet the requirements. In the installation process of the multi-stage pump, for the general small and medium-sized centrifugal pump, it shares a base with the motor, and the whole installation method is used for installation. That is, after the above preparation is completed, the pump and the motor and the base are integrated together. Hang it steadily on the foundation, then align and level. For large multi-stage pumps, the machine base is first hoisted in position and the center position and level are adjusted. Then, the pump and motor are hoisted to the machine base to adjust the shaft end distance of the horizontal coupling.
