2010-04-20 13:36:56 阅读4 评论0 字号:大中小
译文:
管道离心泵的安装技巧: 1、管道离心泵的安装技术关键在于确定水泵安装高度(即吸程)。这个高度是指水源水面到水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摄氏度情况下,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,水泵将会抽不上水来。 2、影响计算值的大小是吸水管道的阻力损失扬程,因此,宜采用最短的管路布置,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。 3、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摄氏度,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摄氏度水温时的饱和蒸汽压力。但是,水温为20摄氏度以下时,饱和蒸汽压力可忽略不计。 4、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,否则将会破坏水泵进水口处的真空度,使水泵出水量减少,严重时甚至抽不上水来。因此,要认真地做好管道的接口工作,保证管道连接的施工质量。
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原文:
Pipeline pump installation tips: 1, the installation of pipeline centrifugal pump technology the key is the installation height (ie, suction). The high is the water surface to pump impeller center line of the vertical distance, it allows a high degree of suction on the vacuum can not be mixed up, pump product specifications or nameplate allows a high degree of vacuum suction on the pump inlet section refers to the vacuum value, and is a standard atmospheric pressure, water temperature 20 degrees Celsius case, trial and determination to come by. It does not take into account the water flow after suction pipe supporting position. The pump mounting height should be allowed to smoke on a high vacuum suction pipe loss deduction after the head, the rest of that part of the value, it is highly absorbent to overcome the actual terrain. Pump installation height can not exceed the calculated value, otherwise, would be no water to pump. 2, the calculated values affect the size of the resistance to water absorption pipe head loss, therefore, should use the shortest possible piping arrangements, and elbows and other fittings installed as little as possible, also be appropriately equipped with larger diameter water mains to reduce the internal velocity. 3, it should be noted that the pipeline centrifugal pump installation site elevation and the water temperature is different from the experimental conditions, such as local elevation of 300 meters or the pumping of water temperature over 20 degrees Celsius, then the calculated values to be amended. That is, different elevation Department of atmospheric pressure and water temperature above 20 degrees Celsius when the saturated steam pressure. However, the water temperature is 20 degrees Celsius, the saturated vapor pressure is negligible. 4, from the pipe installation technology, suction pipes require stringent tightness, can not leak, leakage, otherwise it will damage the intake pump vacuum to pump out the water decreased, serious and even pumping Sheung Shui to. Therefore, to carefully work out the pipe interface, ensuring the construction quality of the connection pipe.