In the process of pump selection, the appropriate pump should be selected based on the following factors.
1. Confirm the Source of the Fluid:
Including underground tanks or above-ground tanks, how far the tanks are located, pipeline configuration and other conditions. It is recommended that the pump should be installed as close to the source of the fluid as possible, and that the suction pipe should be as short as possible to reduce bends or other accessories to reduce pipe friction loss (pipe loss for short - the resistance when fluid passes through the pipeline).
2. Flow Rate, Also Known As Water Pumping Volume (Q):
This is an important indicator, which refers to the amount of liquid passing through the pump per unit time. The units are m³/h, L/min, and L/sec. The amount of flow will affect the size of the pump and the thickness of the piping. If the pipe diameter is too thin, it will cause unnecessary friction loss and also cause noise problems.
3. Total Lift (H):
Refers to the height to which the pump can lift the liquid, that is, the vertical height from the fluid source surface to the final outlet. Total lift = suction lift + pressurized water lift, unit is m. The height of the lift depends on the density of the transported liquid, the diameter of the impeller and the number of stages of the impeller.
4. Fluid Properties:
Fluid corrosiveness, fluid temperature, viscosity, concentration, specific gravity and impurities are also the keys to selecting a pump.
- Corrosiveness - Depending on the pH value of the fluid and its corrosiveness, the applicable pump materials are also different.
- Temperature - when dealing with water, temperature has a great influence on the suction capacity. Other liquids will vaporize after reaching a certain temperature. Grease will greatly change its viscosity due to temperature; heating media, etc. must be considered at high temperatures. To the expansion of materials; chemical fluids will also change their corrosiveness with different temperatures.
- Viscosity, concentration, specific gravity - when the viscosity and concentration of the liquid change, it will affect the corrosion of metals and other materials, and the specific gravity will change accordingly, and the pump performance will also change.
- Impurities - sand contained in muddy water, crystals in chemical liquids, etc. The structure of the pump is selected based on their hardness and content, and wear-resistant materials must be used.
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