1, the selected pump type and performance in line with the device flow, head, pressure, temperature, cavitation flow, suction range and other process parameters.
2, mechanical reliability, low noise, low vibration
3, the economy should take into account the low total cost of equipment costs, operating costs, maintenance costs and management fees.
4, sewage can be idle lifting pump with high speed, small size, light weight, high efficiency, high flow, simple structure, infusion of pulsation-free, smooth performance, easy to operate and maintain convenient and so on.
Therefore, in addition to the following circumstances, should be as far as possible to choose the sewage can be idle lifting pump:
Metering requirements, the choice of metering pump
Head requirements are very high, the flow rate is very small and no suitable small flow of high head sewage can be idling lift pumps can be selected, the choice of reciprocating pumps, such as cavitation requirements are not high when the choice of vortex pumps.
Head is very low, the flow is very large, can choose the axial flow pump and mixed flow pump.
Medium viscosity (greater than 650 ~ 1000mm2 / s), can be considered to use rotor pumps or reciprocating pumps (gear pumps, screw pumps)
Medium gas content of 75%, the flow rate is small and the viscosity is less than 37. 4mm2 / s, can choose the vortex pump.
Frequent start-up or irrigation pump inconvenient occasions, should be used with self-priming performance of the pump, such as self-priming sewage can be idle lift pump, self-priming vortex pump, pneumatic (electric) diaphragm pump.
Should be based on the process, water supply and drainage requirements, from five aspects to be considered, both liquid delivery, device head, liquid nature, piping arrangement and operating conditions, etc.
1, the flow is one of the important performance data of the pump selection, which is directly related to the entire device's production capacity and conveying capacity. If the design institute process design can calculate the pump normal, small, large three kinds of flow. Selection of pumps, based on the large flow, taking into account the normal flow, in the absence of large flow, usually 1.1 times the normal flow as a large flow.
2, the head required by the device system is another important performance data to select the pump, generally used to amplify the head after 5% -10% margin to select.
3, the nature of the liquid, including the name of the liquid medium, physical properties, chemical properties and other properties, physical properties of the temperature c density d, viscosity u, the diameter of solid particles in the medium and the content of the gas, etc., which relates to the system's head, the effective margin of corrosion calculations and the type of suitable pumps; chemical properties, mainly refers to the chemical corrosiveness of the liquid medium and toxicity is the selection of the pump material and the shaft seal type of an important basis.
4, the device system piping arrangement conditions refers to the delivery height of the liquid delivery distance to the direction of the liquid delivery, suction such as the side of the low liquid level, the discharge side of the high liquid level and some other data and pipeline specifications and their lengths, materials, fittings specifications, quantity, etc., in order to carry out the head calculation and the calibration of the cavitation margin.
5, there are many operating conditions, such as liquid operation T saturated vapour force P, suction side pressure PS, discharge side container pressure PZ, altitude, ambient temperature operation is intermittent or continuous, the pump position is fixed or removable.
After the above knowledge combing you must have known how the sewage can be idle lifting pump selection, in addition to the quality you need to trust the sewage can be idle lifting pump products can also contact us, our product managers will be free to provide you with selection and quotation services Oh!
