[Asia Pump Network hearing] The total output pressure of the pump with the head of the existence of numerous relationships between the correct handling of the relationship between the two can help us better use of water pumps. Pump discharge pressure and lift what is the relationship? First, the pump discharge pressure Pump discharge pressure is sent to the liquid pump, the total pressure can have (unit: MPa). It is an important symbol of the pump can complete the task of conveying liquid, the discharge pressure of the pump may affect whether the normal production of the user. Therefore, the pump discharge pressure is based on the actual needs of the design process to determine. According to the needs of the production process and the requirements of the manufacturer, discharge pressure mainly in the following ways. 1, the normal operating pressure of production under normal operating conditions, the required pump discharge pressure. 2, the largest need to discharge pressure changes in production conditions, the conditions may Xin pressure pump discharge pressure. 3, the rated discharge pressure pump manufacturers and to ensure that the discharge pressure. Rated discharge pressure should be equal to or greater than the normal operating pressure. For the vane pump should be the maximum flow discharge pressure. 4, the maximum allowable discharge pressure pump manufacturer according to the pump performance, structural strength, the prime mover power to determine the maximum allowable pump discharge pressure value. The maximum allowable discharge pressure value should be greater than or equal to the maximum required discharge pressure, but should be lower than the maximum allowable working pressure pump pressure components. Second, the pump head H pump lift refers to the unit weight of the liquid obtained by the pump after the energy to H said that the unit is m, that is, the liquid column height of the liquid discharged. The unit pressure of the liquid obtained through the pump after the effective energy, also known as the total lift or full head. It can also be said at the pump outlet and the entrance of the liquid with the energy difference. However, it must be stated that it is only related to the performance of the pump itself and not to the inlet and outlet piping. The head unit is N · m or m column height. For high-pressure pump, pump outlet and inlet pressure difference (p2-P1) is sometimes used to approximate the size of the head. In this case, the head H can be expressed as: where P1 - pump outlet pressure, Pa; Of the inlet pressure, Pa; p - liquid density, kg / m3; g - acceleration of gravity, m / S2. Head is the key performance parameters of the pump, according to the petroleum, chemical process needs and requirements of the pump manufacturer. ①Normal operation Head of the pump under normal production conditions, pump discharge pressure and suction pressure determined by the pump head. ② maximum lift head production needs change, may require the maximum discharge pressure (suction pressure has not changed) when the pump head. Rated head Rated head is rated pump impeller diameter, rated speed, rated suction and discharge pressure of the pump head is determined by the pump manufacturer and to ensure that the lift, and the lift value should be equal to or greater than the normal operation of the lift. Generally take its value equal to the maximum lift required. ④ Close Head The head is closed when the pump flow is zero head. The maximum limit for the pump head, the general discharge pressure under this head to determine the maximum allowable pressure components such as the working pressure of the pump. (Editor: Sea of ​​clouds) Extended reading: 2016 Beijing Petroleum Exhibition Pumps and Valves Pipe Fittings Exhibition Information 2016 Exhibition Information
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