Multi-grade fire pumps are widely used in environmental protection, water treatment, fire protection and other industries. Choosing a cost-effective multi-grade fire pump product can not only improve product efficiency, but also reduce costs. Therefore, the selection of multi-stage fire pumps is particularly important. Today we will discuss how to choose a multi-stage fire pump?
- Use the pump performance comprehensive spectrum to select the pump type. The working areas of the centrifugal pump, the axial flow pump and the mixed flow pump are all drawn on the same picture, which constitutes a comprehensive spectrum of the agricultural water pump series. The drawing is more complicated, but it is more convenient to use. According to the determined design flow and design head, on the type spectrum, firstly, on the ordinate, the pump is designed to find the pumps that meet the head requirements and the flow rates are not equal, and then the design flow is used to determine the selection on the abscissa. Which kind of pump. If the design flow is large, the single pump fails to meet the requirements, and multi-machine operation can be considered, but it should be noted that the same type of water pump should be used as much as possible to facilitate construction, installation and maintenance.
- Use the ISG, IRG vertical pipeline pump performance specification table to select the pump type. The pump factory provides this form in the catalogue. Each model in the table has three rows of data. Which one is the default? The general design flow and design head should be the same as the value in the middle row listed in the performance table. Consistent, or close, but must fall within the range of the upper and lower lines, because this range is the high efficiency area of the pump operation, this type of pump is considered to meet the actual needs, the pump is selected .
- Use the ISW horizontal pipe centrifugal pump selection table to select the pump type. According to the determined design head and design flow, in the selection table, the horizontal head looks for the head value that is consistent with or close to the design head; and then finds the flow value that is consistent with or close to the design flow in the vertical head. The vertical and horizontal intersects the small square, which marks the model of the pump and initially selects the pump type. However, there are times when both pump types meet the design requirements. In this case, the two pump types can be compared for technical and economic analysis, and then one of the appropriate pump types is selected. This method of selecting a water pump is relatively simple and quick.