共查询到20条相似文献,搜索用时 78 毫秒
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LLY—高效过滤器水头损失公式推导1990年,东北电力学院研究成功一种纤维过滤器——LLY一高效过滤器,它继承了传统颗粒状滤料过滤器运用范围广泛的优点,从过滤方法上突破了原有模式,克服了颗粒状滤料过滤器过滤精度差、滤速低等缺点。lff料、德层特征LL... 相似文献
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在给水工程应用中经常要用到水头损失的计算公式,一般情况下计算水头损失都是从水力摩阻系数入等基本参数出发,一步一步的代入计算。其实各个公式之间是有一定的联系的,有的参数在计算当中可以抵消。如果公式中只剩下流速、流量、管径这些基本参数,那么就会给计算者省去不少的麻烦。在此我们充分利用了各参数之间以及水头损失与水温的关系,将公式整理简化,供大家参考。 相似文献
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氧化沟的水头损失计算与导流板偏置的作用 总被引:5,自引:1,他引:4
以T型氧化沟为例阐述了曝气围刷的提升水头与沟内水头损失的关系,剖析了氧化沟两端弯道设置导流板的减阻作用,提出了导流板偏置可以避免弯曲隔墙背流处的固体沉淀,减少导流板的数量。 相似文献
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根据目前卡箍式铸铁排水管在建筑设计、施工中广泛使用,从卡箍式铸铁排水管组成、特点、施工安装工艺及连接方法、试压、技术经济分析等方面进行了论述,从而更好地指导卡箍式铸铁排水管的安装施工,解决施工过程中遇到的实际问题。 相似文献
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介绍了卡箍式离心排水铸铁管的产品性能,分析了卡箍式排水铸铁管的组成及工艺原理,详细地介绍了卡箍式离心铸铁排水管安装工艺,强调了安装过程中应注意的问题,从而推广卡箍式离心铸铁排水管的应用。 相似文献
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详细介绍了PVC-U排水管、PVC-U内螺旋排水管、卡箍式排水铸铁管的性能、主要特点及应用范围,通过认真分析比较,指出在建筑中使用何种管材应从多方面考虑,对不同类型的建筑应使用不同的管材。 相似文献
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结合离心铸铁排水管的应用情况,从施工特点、适用范围、工艺原理、操作工艺、操作要点等方面对离心铸铁排水管柔性连接技术进行了总结,并对施工安全事项作了说明,以促进该技术的推广应用。 相似文献
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高振生 《建筑科学与工程学报》1999,16(4):49-51
依据暖卫施工规范、全国统一安装工程预算定额及工程量计算规则的规定,针对建筑给排水工程量计算的一些问题,给出了工程量计算优化的原则、铸铁管及存水弯的除锈刷油工程量计算表,并指出了预算定额中工程量计算表的一些数据的错误. 相似文献
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介绍了管网的基本方程组和给水管网水力计算的方法,并且在计算过程中加入旁路损失,最后得出了结论,指出在小型或者附件较多的给水管网计算中,必须考虑局部损失的影响,否则会引起流量或压力分配不均。 相似文献
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A significant proportion of current water networks are composed of cast iron pipes. The occurrence of failures of this type of pipe is increasing due to ageing and progressive deterioration (i.e. corrosion). This necessitates the completion of structural integrity assessment and reliability analysis of in-service cast iron water pipes. The failure of a cast iron pipe can be characterised by fracture, when the stress intensity factor exceeds the toughness of the pipe material. In this research, a stochastic model for the stress intensity factor is developed and a time-dependent analysis method is employed to quantify the failure probability so that the time for the pipe to be failed and, hence, requiring repairs or replacement is determined with confidence. For a comprehensive structural assessment, two types of stresses (hoop and axial) are considered for two cases of corrosion (external and internal). A case study is provided to illustrate the application of the proposed method. In the system failure analysis, it is found that hoop stress is the dominant stress, since it can result in external corrosion, the effects of which are known to be of greater significance than those caused by internal corrosion. 相似文献
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结合黄河水源太原市城市给水工程施工实例,从其施工工序、成品保护、变坡点的安装等方面,总结了大型球墨铸铁管施工中的经验,为给水工程地下管线的施工提供了参考。 相似文献
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Failure of cast iron water mains in Australia is a common occurrence. Water utilities are seeking solutions to optimise the renewal and rehabilitation of ageing cast iron critical water mains (diameter ≥ 300 mm). Failure pressures of three large-diameter cast iron pipe specimens (600 mm in diameter) were tested. A large corrosion patch was machined onto each pipe section to initiate pipe failure. A large corrosion patch and significant reduction (>90%) of pipe wall thickness were needed to fail the tested pipe specimens. All three pipes under test exhibited leaking before bursting, indicating that the concept of leak-before-break (LBB) could be used for pipe failure prevention. In addition, LBB provides valuable information that could be added to the pipe asset database to make better management decisions on repair or replacement along with all other asset information. The study also found that small corrosion patches (<50 mm) with low remaining wall thickness may cause pipe leaks, but are less likely to cause major pipe bursts. 相似文献