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首页> 外文期刊>Water and Energy International >Residual Life Assessment (RLA)/ Life Expectancy (LE) Studies & Life Extension Plan of Francis Runners (250 MW) of the Nathpa Jhakri Hydro Power Station
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Residual Life Assessment (RLA)/ Life Expectancy (LE) Studies & Life Extension Plan of Francis Runners (250 MW) of the Nathpa Jhakri Hydro Power Station

机译：纳斯帕贾克力水电站的弗朗西斯赛跑者（250 MW）的剩余寿命评估（RLA）/预期寿命（LE）研究和寿命延长计划

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The runner of NJHPS suffers extensive silt erosion. To make up for the metal loss and approximately fix the blade profile these runners are repaired every year by welding and grinding process.The repair is carried out by austenitic electrode with no post weld heat treatment.Over the period after about 9 operating cycles it is observed that the weight of runner have reduced by about 5 tons (15%) and cracking of runner blades at exit has increased considerably. The runners of NJHPS has run for approx. 35000 hrs and approx. 65lac ton of silt has passed through the runners.The runners are fabricated type of Europeon origin. The lead time in purchasing or making the new runner available could be considerably high. Presently no vendor in India has the full capability to manufacture this runner of material 16/5 steel with fabricated structure.The runner is an important component for overall integrity of plant, therefore, it is necessary for SJVN to measure the risk and take the remedial actions in advance.
机译：NJHPS的流道遭受广泛的淤泥侵蚀。为了弥补金属损失并大致固定叶片轮廓，这些流道每年通过焊接和磨削工艺进行维修。维修工作是通过奥氏体电极进行的，无需进行焊后热处理。在大约9个工作循环后的整个周期内观察到，流道的重量减少了约5吨（15％），流道叶片在出口处的裂纹明显增加。 NJHPS的跑步者已经跑了将近一个。 35000小时左右流道经过了65吨的淤泥。流道是欧洲制造的。购买或提供新跑步者的交货时间可能会很高。目前印度没有供应商有能力制造这种具有制造结构的材料16/5钢流道，流道是工厂整体完整性的重要组成部分，因此，SJVN有必要衡量风险并采取补救措施提前采取行动。

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