A certain mechanical and electrical equipment company in Guizhou procures MD85-80X7P self-balancing multistage pumps.
Industry: Mining industry
Project Address: Guizhou
Pump flow rate: 85 m³/h
Pump head: 560 m
Extraction medium: Clear water
Pump model: MD85-80X7P
Pump type: Self-balancing multi-stage pump for mining
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Project Introduction
A certain mechanical and electrical equipment company in Guizhou procures MD85-80X7P self-balancing multistage pumps.
In the second half of last year, the project manager of a mechanical and electrical equipment integration company in Guizhou took on an underground drainage renovation project for a coal mine in Qianxi. Just as the old-style multistage pump they’d ordered was delivered to the site and installed, they realized that the underground tunnels were only about one meter wide. The pump’s balance disc alone occupied a considerable amount of space, making it virtually impossible to carry out any subsequent maintenance or repairs. Even more troubling, when they tested the pump by turning it on, the vibration was so intense that even the nearby support beams started humming. The noise was so loud that workers had to shout just to be heard. The client’s safety officer immediately issued a corrective action notice, giving them just one week to resolve the issue—or else their payment would be withheld. For those few days, the mechanical and electrical project manager practically lived and slept at the mine, frantically searching everywhere for a suitable replacement pump.
While venting to a colleague, he included a photo of the underground site. Unexpectedly, a friend privately messaged him: “Check out Changsha Zhonglian Pump Industry—they specialize in self-balancing multistage pumps designed specifically for the narrow spaces found in mines. I used one at a mine in Liupanshui last year, and it’s really reliable!” That very afternoon, he dialed the free hotline of Changsha Zhonglian Pump Industry. The technical consultant who answered the call didn’t start by touting their products right away; instead, he immediately bombarded him with a series of crucial questions: “What’s the sand content of the underground medium? What’s the required head in meters? And what’s the maximum load-bearing capacity of the installation site?” In the end, the consultant even asked them to send a video of the tunnel and detailed measurements of the space reserved for equipment installation, saying they’d tailor a solution specifically for his needs.
The next day, as soon as we started work, the technical consultant from Changsha Zhonglian Pump Industry sent over the proposal. The core recommendation was... MD85-80X7P Self-balancing Multistage Pump And he even made a special phone call to highlight the advantages: “This pump eliminates the balance disc structure commonly found in conventional multistage pumps. Its body length is only 1.8 meters—35% shorter than your previous pump—making it just right for fitting into your pre-installed space. For future maintenance, you’ll need only about 50 centimeters of clearance. Moreover, its self-balancing design cancels out more than 95% of axial forces, keeping vibration levels during operation below 4.5 mm/s and noise levels below 75 decibels—completely meeting the requirements of coal mine safety regulations.”
When the pump was installed, Zhonglian’s technicians accompanied the workers down into the mine, carefully aligning the positioning and connecting the pipelines according to the installation drawings. The entire installation was completed in less than six hours. During the initial test run, we noticed only a slight vibration—so slight that we didn’t need to raise our voices to carry on a conversation. After one month of operation, the equipment department of the coal mine conducted a comprehensive inspection. The pump’s outlet pressure remained stable at 1.2 MPa, and the motor current fluctuated by no more than 5%, demonstrating even greater stability than the design specifications.
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