离心泵的关键安装技术
管道离心泵的安装技术关键在于确定离心泵安装高度即吸程。这个高度是指水源水面到离心泵叶轮中心线的垂直距离，它与允许吸上真空高度不能混为一谈，水泵产品说明书或铭牌上标示的允许吸上真空高度是指水泵进水口断面上的真空值，而且是在1标准大气压下、水温20℃情况下，进行试验而测定得的。它并没有考虑吸水管道配套以后的水流状况。而水泵安装高度应该是允许吸上真空高度扣除了吸水管道损失扬程以后，所剩下的那部分数值，它要克服实际地形吸水高度。水泵安装高度不能超过计算值，否则，离心泵将会抽不上水来。另外，影响计算值的大小是吸水管道的阻力损失扬程，因此，宜采用短的管路布置，并尽量少装弯头等配件，也可考虑适当配大一些口径的水管，以减管内流速。应当指出，管道离心泵安装地点的高程和水温不同于试验条件时，如当地海拔300米以上或被抽水的水温超过20℃，则计算值要进行修正。即不同海拔高程处的大气压力和高于20℃水温时的饱和蒸汽压力。但是，水温为20℃以下时，饱和蒸汽压力可忽略不计。从管道安装技术上，吸水管道要求有严格的密封性，不能漏气、漏水，否则将会破坏离心泵进水口处的真空度，使离心泵出水量减少，严重时甚至抽不上水来。因此，要认真地做好离心泵管道的接口工作，保证管道连接的施工质量(图\文www.wxjpby.com/index.asp)。
中译英：
Pipeline centrifugal pump / installation technology is the key to determine the suction centrifugal pump installation height. This highly refers to the water surface to the centrifugal pump impeller centerline vertical distance, and it allows suction vacuum height can not be confused, pump product brochures or nameplate marked on the allowable suction vacuum pump inlet section refers to the value of the vacuum on, and was in the 1standard atmospheric pressure, water temperature 20℃test and measurement, the. It does not take into account the suction pipe supporting later flow condition. And the pump mounting height should be allowed to deduct the suction vacuum suction piping loss of lift, the remaining portion of numerical value, it is to overcome the real terrain suction height. Pump mounting height should not exceed the calculated value, otherwise, centrifugal pump will be pumped to not Sheung shui. In addition, affect the calculation value is the size of the suction piping resistance loss of lift, therefore, should adopt the most short circuit arrangement, and minimize the loaded elbow parts, may also be considered appropriate with a larger caliber pipe, to reduce the flow velocity in the tube. It should be noted, the pipeline centrifugal pump installation site of the elevation and water temperature is different from the test conditions, such as local altitude 300 meters of above or by pumping water temperature is over 20 ℃, then the calculation of value must be amended. The different elevation at atmospheric pressure and temperature of above 20 DEG C saturated steam pressure. However, the water temperature is 20℃, the saturation vapor pressure is negligible. From the pipeline installation technique, water pipes required strict sealing, not leakage, water leakage, otherwise it will destroy the centrifugal pump inlet vacuum degree, the centrifugal pump to reduce the amount of water, serious when can't even afford Sheung shui. Therefore, to seriously do a good job of centrifugal pump pipeline interface, ensure the construction quality of pipe connection.
