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原文：
泵选型依据，应根据工艺流程，给排水要求，从五个方面加以考虑， 既液体输送量、装置扬程、液体性质、管路布置以及操作运转条件等。 1、胶体磨流量是选泵的重要性能数据之一，它直接关系到整个装置的的生产能力和输送能力。如设计院工艺设计中能算出泵正常、最小、{zd0}三种流量。选择泵时，以{zd0}流量依据,兼顾正常流量，在没有{zd0}流量时，通常可取正常流量的1.1倍作为{zd0}流量。 2、装置系统所需的扬程是选泵的又一重要性能数据，计量泵一般要用放大5%—10%余量后扬程来选型。 3、液体性质，包括液体介质名称，物理性质，化学性质和其它性质，物理性质有温度c密度d，粘度u，介质中固体颗粒直径和气体的含量等， 这涉及到系统的扬程，有效气蚀余量计算和合适泵的类型：化学性质，主要指液体介质的化学腐蚀性和毒性转子泵，是选用泵材料和选用那一种轴封型式的重要依据。 4.装置系统的管路布置条件指的是送 液高度送液距离送液走向，吸如侧{zd1}液面，排出侧{zg}液面等一些数据和管道规格及其长度、材料、管件规格、数量等，以便进行系梳扬程计算和汽蚀余量的校核。 5、操作条件的内容很多，如液体的操作T饱和蒸汽力P、吸入侧压力PS（{jd1}）、排出侧容器压力PZ、海拔高度、环境温度操作是间隙的还是连续的、泵的位置是固定的还是可移螺杆泵的。

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译文：
Pump selection basis, should be based on process, water supply and drainage requirements, from five to consider the amount of both liquid delivery, installation head, liquid properties, pipe layout, and use the operational conditions. 1, colloid pump flow was electedone of the important performance data, it is directly related to the device's capacity and transmission capacity. Such as process design institute to calculate the pump normally, minimum, maximum three kinds of traffic. Select pumps to maximum flow basis, taking into account the normal flow, in the absence of maximum flow, it is usually desirable to 1.1 times the normal traffic flow as the largest. 2, device selection system requires the pump head is another important performance data, metering pumps generally use the zoom 5% -10% margin to lift after the selection. 3, fluid properties, including the name of the liquid medium, physical properties, chemical properties and other physical properties of a temperature c density d, the viscosity u, the medium diameter of solid particles and gas content, which involves the system's head, the effective cavitation margin calculation and the right pump type: chemical properties, mainly refers to the liquid medium corrosive and toxic chemical rotor pump is used pump shaft seal materials and type of use is a major basis. 4. Device system piping layout condition refers to a high degree of delivery fluid delivery fluid delivery fluid from the trend of smoking, such as minimum liquid side, discharge side of the maximum liquid level and some data and pipe specifications and its length, material, pipe size, quantity for line comb head and NPSH calculation check. 5, the contents of many operating conditions, such as liquid saturated steam power operation T P, the suction side pressure PS (absolute), discharge side of the container pressure PZ, altitude, ambient temperature operation is a gap or continuous, the location of the pump is fixed thing can move the screw pump.