Ultimate Bearing Capacity Analysis of Pipelines under Water Hammer

Wu, Liyang; Wang, Huijie; Li, Xuyao; Sang, Zhiqian; Chen, Zhanfeng

doi:10.1061/jpsea2.pseng-1506

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…The water column separation in the hydraulic transition process of the pumping station pipeline system and the subsequent shut-off and rebridging water hammer can cause great potential harm to long-distance water pipeline projects. Therefore, for pumping stations that may generate water hammer hazards, water hammer calculations for accidental pump shutdowns should be carried out at all design stages [8]. The occurrence mechanism of a shut-off bridging water hammer is different from the traditional valveclosing water hammer and pump-stopping water hammer, and its occurrence location is difficult to determine in advance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effectiveness of Water Hammer Protection Programs for Complex Long-Distance and High-Head Water Supply Projects

Tang,

Cheng,

Shen

et al. 2024

Water

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The purpose of this research is to solve the complex long-distance and high-lift water supply engineering accident water hammer protection problem. Taking the Zhaojinzhuang water supply project as an example, based on the method of characteristics (MOC), the water hammer of the pumping station under the combined action of a water hammer relief valve, hydraulic-control butterfly valve, air vessel, air valve, and other water hammer protection measures is numerically simulated and calculated, and the effectiveness of the range method is analyzed, to ensure a waterproof hammer in pump stop accidents. The results show that the main factors affecting the effect of water hammer protection under the two-stage valve-closing parameters of the hydraulic-control butterfly valve are the fast-closing angle and the slow-closing time. The arrangement of the air vessel behind the pump can effectively increase the minimum water hammer pressure in the climbing section, and with the increase of the volume of the air vessel, the pump reverse speed and the maximum positive pressure increase slightly, but the overall water hammer protection effect is better. With the increase of the moment of inertia of the motor, the maximum positive pressure and minimum negative pressure of the pipeline still do not meet the requirements of the specification, and the modification cost is relatively large. The combination of the one-stage hydraulic-control butterfly valve, the air valve, the air vessel, and the water hammer relief valve can effectively reduce the volume of the air vessel. Under the optimal method, the maximum positive pressure head is 236.61 m, and the minimum negative pressure head is −3.18 m. Compared with the original method, the maximum positive pressure head is increased by 1.18%, the minimum negative pressure head is reduced by 95.78%, the maximum reverse speed of the pump is reduced by 100%, and the maximum reverse flow of the pump is reduced by 70.27%, meeting the requirements of water hammer protection. This is a safe and economical protection method.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Effectiveness of Water Hammer Protection Programs for Complex Long-Distance and High-Head Water Supply Projects

Tang,

Cheng,

Shen

et al. 2024

Water

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Research on Fault Detection and Automatic Diagnosis Technology of Water Hammer in Centrifugal Pump

Chen,

Li,

Shi

et al. 2024

Applied Sciences

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Centrifugal pumps are important equipment in industrial production, and their safe and reliable operation is of great significance to water supply and industrial safety. During the use of centrifugal pumps, faults such as bearing damage, blade wear, shaft imbalance, shaft misalignment and water hammer often occur. Among them, although water hammer faults occur at a low frequency, they are difficult to monitor and pose significant risks to valve and pipeline interfaces. This article analyzes the causes, mechanisms and phenomena of water hammer faults in centrifugal pumps, designs a monitoring method to effectively monitor the vibration signal of the centrifugal pumps, extracts vibration characteristics to determine and record water hammer events, designs monitoring and diagnostic models for the edge layer and server side, and establishes an experimental verification testing system. The test results show that, under the conditions of simulating water hammer faults, after high-pass filtering of the collected vibration data, the kurtosis index, pulse index and margin index all exceed twice the threshold, and both sensors emit water hammer alarms. The designed data acquisition method can capture water hammer signals in a timely manner, and the analysis model can automatically identify water hammer faults based on existing fault knowledge and rules. This fully demonstrates the scientific and effective nature of the proposed centrifugal pump fault monitoring method and system, which is of great significance for ensuring the safe operation and improving the design of centrifugal pumps.

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Ultimate Bearing Capacity Analysis of Pipelines under Water Hammer

Cited by 2 publications

References 34 publications

Analysis of the Effectiveness of Water Hammer Protection Programs for Complex Long-Distance and High-Head Water Supply Projects

Analysis of the Effectiveness of Water Hammer Protection Programs for Complex Long-Distance and High-Head Water Supply Projects

Research on Fault Detection and Automatic Diagnosis Technology of Water Hammer in Centrifugal Pump

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