NEWS
NEWS INFORMATION
/
/
/
Harm of cavitation of slurry pump

Harm of cavitation of slurry pump

Harm of cavitation of slurry pump

Harm of cavitation of slurry pump

Harm
When cavitation occurs in the submerged slurry pump, a large number of bubbles are generated, developed and collapsed, which destroys the normal flow law of the water flow. The overflow area in the flow channel is reduced and the flow direction is changed. Therefore, the energy exchange between the impeller and the water flow is disturbed and damaged, and the energy loss increases, resulting in the rapid decline of the flow, head and efficiency of the water pump, and even the cut-off state.

When cavitation occurs in the submerged slurry pump, a large number of bubbles are generated, developed and collapsed, which destroys the normal flow law of the water flow. The overflow area in the flow channel is reduced and the flow direction is changed. Therefore, the energy exchange between the impeller and the water flow is disturbed and damaged, and the energy loss increases, resulting in the rapid decline of the flow, head and efficiency of the water pump, and even the cut-off state.


The characteristics of performance degradation caused by cavitation are different for submerged slurry pumps with different specific speeds. For low specific speed centrifugal pumps, the flow channel between blades is narrow and long, and the width is small. After cavitation begins, the bubble area first appears at the inlet of the blade flow channel, and quickly expands to the whole width of the flow channel, "blocking" the whole flow channel, damaging the continuity of water flow, and the performance curve of submerged slurry pump shows a sharp decline, A "fracture" condition occurs. For medium and high specific speed centrifugal pumps and mixed flow pumps, because the impeller channel is relatively wide, it is not easy to be "blocked" by bubbles, so the performance curve of submerged slurry pump first decreases slowly. When the flow increases and cavitation develops to a certain extent, the "fracture" working condition occurs. For high specific speed axial flow pump, due to less blades, less overlap between blades and wide flow channel, the cavitation area is not easy to expand to the whole flow channel after cavitation begins. Therefore, the performance curve not only decreases slowly, but also there is no "fracture" condition.


When the bubble is brought to the high-pressure area by the water flow and quickly condenses and collapses, the water particles around the bubble concentrate to the center of the bubble at high speed, resulting in a strong impact. The observation data show that the bubble collapse can be completed in milliseconds or even microseconds. Therefore, it produces a great impact force, and the local pressure can reach even hundreds of MPa. If the bubble collapses near the surface of the flow passage part, it will strike the flow passage part. Under the constant impact of such high frequency and high pressure, the metal materials of flow passage parts cause plastic deformation and local hardening, fatigue and brittle performance, and cracks and spalling will soon occur, resulting in the formation of honeycomb holes. The further action of cavitation makes the cracks penetrate each other and connect the holes until the impeller or pump shell is corroded or even broken. This is the mechanical denudation effect of cavitation on the metal surface of flow passage parts.

Publicity and implementation meeting of design standard for slurry long distance pipeline transportation engineering

Publicity and implementation meeting of design standard for slurry long distance pipeline transportation engineering

From July 16 to July 17, 2020, the national group standard publicity and implementation meeting for slurry long-distance pipeline transportation and the second meeting of the third slurry concentration and pipeline transportation Academic Committee (hereinafter referred to as the "academic committee") were successfully held in Gongqing City, Jiangxi Province. The meeting was hosted by the academic committee of slurry concentration and pipeline transportation and Changsha Nonferrous Metallurgy Design and Research Institute Co., Ltd., organized by the member China Petroleum Pipeline Engineering Co., Ltd. and co organized by Jiangxi ruiti Pipeline Co., Ltd. The theme of the meeting was the publicity and implementation of the slurry pipeline group standard (design standard for slurry long-distance pipeline transportation engineering (T / cecs98-2019, edited by Changsha Nonferrous Metallurgy Design and Research Institute Co., Ltd.), coextrusion wear-resistant layer reinforced plastic composite pipe and joint (T / cstm00173-2019, edited by Jiangxi ruiti Pipeline Co., Ltd.) and the discussion of the 2020 work plan and development plan of the academic committee. A total of 33 people, including representatives of the academic committee, drafters of the main participating units of the standard and leaders of relevant departments of the Communist Youth City Government, attended the meeting. Zou Weisheng, the director of the third academic committee, first delivered a welcome speech. Li Xuzhong, the editor in chief of the standard and the design master of the national nonferrous metals industry, explained the content and application of the new standard in detail. Zhang Wenwei, the chief engineer of China Petroleum Pipeline Engineering Co., Ltd. and the national survey and design master, and Yang Mingkun, the general manager of Jiangxi ruiti Pipeline Co., Ltd., delivered passionate speeches.
All Party members and activists study party history together

All Party members and activists study party history together

Based on the important moment of the Centennial birthday of the Communist Party of China and the key node of the historical intersection of the "two centenary" goals, and standing at the height of the era of coordinating the overall strategic situation of the great rejuvenation of the Chinese nation and the great changes not seen in the world in a century, the speech deeply expounds the great significance, key contents and work requirements of carrying out the study and education of party history, which is of great significance to learning the party's history, carrying forward the party's tradition and starting a new journey in the new era Make important arrangements for creating new great undertakings. The speech is strategically located, has a broad vision and profound thought. It is the first lesson of the "opening of school" that makes clear the meaning and inspires people to make progress. It is a history education course that knows history, learns from the present and looks into the future. It is a party spirit cultivation course that sharpens the original heart and keeps the mission in mind. It points out the direction and provides fundamental guidance for the study and education of party history.
Harm of cavitation of slurry pump

Harm of cavitation of slurry pump

When cavitation occurs in the submerged slurry pump, a large number of bubbles are generated, developed and collapsed, which destroys the normal flow law of the water flow. The overflow area in the flow channel is reduced and the flow direction is changed. Therefore, the energy exchange between the impeller and the water flow is disturbed and damaged, and the energy loss increases, resulting in the rapid decline of the flow, head and efficiency of the water pump, and even the cut-off state.

Kingda pump group Xingtang Pump Co., Ltd 

Kingda Pump Industry Group Co., Ltd

Add:Xingtang County, Shijiazhuang, Hebei, China
Tel:
0311-85426662/6661
Fax:0311-85426671
Mail:info@kingdapump.com

这是描述信息
©2021 Kingda pump group Xingtang Pump Co., Ltd
Power by: 中企动力

SEO TAG

kingda pump