【 Weak current College 】 pipeline pump selection requirements-general--Power By 【 China power house network 】

Pump selection basis, according to the process, and drainage requirements, from the five aspects to be taken into account, both liquid transfer amount, unit head, liquid nature, hoses, and manipulate the operating conditions, etc.

1, Colloid mill flow is selected pump critical performance data that directly relates to the entire apparatus of production capacity and transmission capacity. If the design process design can work out pumps normal, minimum, maximum three traffic. Select a pump, the largest flow basis, taking into account the normal flow, where there is no maximum flow is usually preferable to the normal flow of 1.1 times as the maximum flow.

2. unit system required lift is selected pump another important performance data, metering pump to enlarge the General 5%-10% allowance lift after selection.

3, liquid properties, including name, physical properties of liquids, chemical properties and other nature, physical properties with temperature viscosity c density d, u, medium solid particle diameter and gas content, etc., this involves a system of lift, valid cavitation allowance calculation and suitable pump type: chemical properties, mainly refers to the chemical corrosivity liquid media and toxicity of rotor pump, is the selection of the pump materials and use a shaft seal type of important basis.

4. the system of hoses condition refers to the distance songye songye songye height to a minimum, such as side, from the side of the liquid at the highest level, and so some data and pipeline specifications and its length, material, pipe fittings, specifications, quantity, etc., for the calculation of combing head and checking of NPSH.

5. operating conditions of many actions, such as liquid saturated steam power T P, inhalation of lateral pressure PS (absolute), from the side of the vessel pressure PZ, altitude and the ambient temperature operation is a gap or continuous, pump location is fixed or removable screw pump.