The principle of pump selection: economy, high efficiency and energy saving
First, the economic principle: according to the specific gravity, viscosity and corrosiveness of the medium, select the most suitable pump material and the most suitable pump type, so as to ensure the service life of the pump.
Two. High efficiency principle: choose the high efficiency pump as far as possible, and choose the large pump as much as possible when the performance parameters are suitable, because the large pump is more efficient than the small pump.
Three. Energy saving principle: try to make the pump be used in the case of equal or close to the rated condition, which can improve the operation efficiency of the pump. In addition to this, we should take full account of the combined work of the pump, so as to keep the pump efficient in all circumstances.
Water pump selection method (steps):
1. List the basic data:
1, the characteristics of medium: medium name, specific gravity, viscosity, corrosiveness, toxicity and so on.
2. The diameter and content of the particles in the medium.
3, medium temperature
4, the required flow
5, pressure: the pressure of the suction pool, the pressure of the drainage pool, the pressure drop in the pipe system (head loss).
Two. Determine the flow and lift:
1, flow is one of the important performance data of the pump, which is directly related to the production capacity and transport capacity of the whole device. If the design institute process design can calculate the pump normal, minimum, maximum three kinds of flow. When the pump is selected, the maximum flow is based on the normal flow. When there is no maximum flow, it is usually advisable to use 1.1 times the normal flow as the maximum flow.
2. The lift required by the device system is another important performance data of the pump, which is generally used to enlarge the 5%&mdash and 10% after the lift.
Three. Determine the material of the pump:
1, the material of the pump must meet the requirements of the medium characteristics: liquid properties, including the name of the liquid medium, the physical property, the chemical property and other properties. The physical properties of a temperature C density D, the viscosity u, medium diameter of solid particles and gas content, which relates to the type of the lift system, effective cavitation margin calculation and the right pump; chemical properties, mainly refers to the liquid medium corrosive and toxic chemicals, pumps are selected materials and use is a major basis seal.
Four. Determine the type of pump:
1, according to the layout, topography, water level and operation conditions, we must choose horizontal, vertical and other types (pipeline, submersible, submerged, non blocking, self suction, gear type, etc.).
2, according to the nature of liquid medium, determine the water pump, hot water pump or oil pump, chemical pump or corrosion resistant pump or impurity pump, or the use of non blocking pumps. The pump installed in the explosion area should be based on the level of the explosion area, and the corresponding explosion-proof motor should be used.
3, according to the size of the flow, determine the double suction pump suction pump or menu; according to the lift height, menu or pump multistage pump, high speed pump or low speed pump (air conditioning pump), multistage pump efficiency than single-stage pump is low, such as menu pump and multi-stage pump can also use, first choose the single stage pump.
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