With the process flow rate and head known, how to choose a pump? How much magnification is appropriate?
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Process parameters: Pump 1, 8.2 m3/h at 51 m; Pump 2, 1.6 m3/h at 43 m; Pump 3, 0.9 m3/h at 40 m; Pump 4, 20 m3/h at 20 m. For transporting a clean medium of Category B, what flow rates and head values should be chosen for the pumps? :handshake, please give your advice
It depends on the density of the liquid you are transporting. For ordinary water, a head of 10m corresponds to a pressure of 0.1MPa. Calculate pressure based on head; of course, also pay attention to the liquid’s composition when selecting the pump material
Reply to 2# wxpwyp: The density is 0.85, which is slightly lighter than water.
Based on your head and flow rate, this diaphragm pump can be used
Reply to 4# LEIVER: Oh, then your requirements are roughly between 1.7Mpa and 4.4Mpa. Pressure is a factor to consider; if high precision is required, it is recommended to use a metering pump. I’m not quite familiar with the rest
Reply to 3# zhenjizhr: I’m extremely sorry; I replied to the wrong person. Your requirements are roughly between 1.7 Mpa and 4.4 Mpa. Pressure is a factor to consider; if high precision is required, it is recommended to use a metering pump. I’m not quite familiar with the rest.
Reply to 4# LEIVER: I’m extremely sorry. The reply was meant for the original poster, but it ended up going to you instead. Please bear with me
The traffic amplification factor is generally 1.1 to 1.15.
Reply to 7# wxpwyp: Haha, it’s okay; we can learn from each other*
With only these few pieces of data, it’s not possible to select a pump; it is recommended that the original poster refer to other sources
The purchase of centrifugal pumps requires the following information: 1. Name and quantity of the products to be purchased. 2. If there is a reference model, it should be specified along with the technical parameters: flow rate (operating flow rate × 1.15), inlet and outlet pressures, head, and NPSHa (effective net positive suction head). The safety margin for NPSHa should be between 0.16–1.0 m; however, this margin varies depending on the type and purpose of the centrifugal pump, as shown in Table 3.0.1 (for more details, refer to HG20570.5-95 regarding the calculation of pump system characteristics and the determination of the relative installation height of equipment). Information on the name and physical properties of the fluid to be transported is also required. 3. Material requirements for the main components. 4. Any other special requirements, such as those related to mechanical seals. 5. If cooling water is required, the owner’s cooling water pressure parameters must be provided. 6. Environmental conditions, including the explosion-proof area classification and voltage parameters; high altitude in certain areas can cause corona effects, which reduce the motor’s output.