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首页> 外文会议>Western Dredging Association Twenty-Second Technical Conference, Thirty-Fourth Texas Aamp;M Dredging Seminar, and Special Permanent International Association of Navigational Congresses Session, Jun 12-15, 2002, Denver, Colorado >The Economical Benefits of Nose Wear Adjustment
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The Economical Benefits of Nose Wear Adjustment

机译：鼻架调整的经济效益

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摘要

Maintaining a correct impeller nose gap has long been emphasized as a critical element in achieving maximum centrifugal slurry pump wear life and efficiency. As the gap between the impeller and suction liner increases, so does the wear rate of these components. Design improvements to reduce local nose wear and maintain a tighter gap have previously been justified solely to increase the suction liner and impeller wear life. Efficiency and production losses have not been given due consideration as major economic factors. The flow mechanism of the impeller shroud to shell interface, which determines liner and nose wear rates, will be briefly explained. This includes the particle size impact, and nature of the side gap flow pattern where smaller particles tend to avoid being expelled by any clearing mechanism and can reach the nose area with damaging effects. An example analyzes the potential economic benefit for an industry typical 45,000 gal/min (2,852 liter/sec) dredge application with and without nose gap maintenance for three different adjustment cycles. All assumptions of the cost benefit analysis are discussed and evaluated. Although the calculation approach is rather conservative, the real potential cost reductions are quite significant. In summary, financial returns over a pump operational lifespan of twenty years could be in the million dollar range. Maintaining the correct nose gap during operation can increase production rates and while reducing both downtime and replacement part cost.
机译：长期以来，一直强调保持正确的叶轮鼻隙是实现最大离心浆泵磨损寿命和效率的关键因素。随着叶轮和吸气衬套之间的间隙增加，这些组件的磨损率也会增加。以前为减少吸入鼻和保持更紧密的间隙而进行的设计改进，仅是为了延长吸入衬套和叶轮的磨损寿命而已。没有将效率和生产损失作为主要经济因素予以适当考虑。将简要说明叶轮罩到壳体界面的流动机理，该流动机理决定了缸套和机头的磨损率。这包括颗粒尺寸的影响，以及侧隙流型的性质，较小的颗粒倾向于避免被任何清除机制排出，并可能以有害作用到达机头区域。一个示例分析了一个行业典型的45,000加仑/分钟（2,852升/秒）挖泥机应用的潜在经济效益，该挖泥应用在三个不同的调整周期下都保持或不保持鼻隙。讨论并评估了成本效益分析的所有假设。尽管计算方法相当保守，但实际的潜在成本降低却非常可观。总之，在泵的二十年使用寿命中，财务回报可能在数百万美元左右。在操作过程中保持正确的鼻隙可以提高生产率，同时减少停机时间和更换零件成本。

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