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Common Problems and Solutions In The Use of Slurry Pumps

Jan. 05, 2021

Slurry pump is a common machine that uses centrifugal force to increase the energy of solid-liquid mixed media. It is mainly used in mining, metallurgy, construction and other fields. As a common and practical auxiliary tool, slurry pumps have three common problems during use, that is, flow instability, cavitation, and seal failure, which will lead to the problem of slurry pump leakage. Then how do you solve such problems? What? The following Slurry Pump Manufacturers come to popular science!

How to solve the unstable flow of slurry pump?

The reasons for the unstable flow of the slurry pump are roughly as follows:

1. The suction pipe or bottom valve is leaking, or the water inlet is blocked, which is a common cause of insufficient flow. It is necessary to check the air leakage source of the suction pipe and the bottom valve and block it in time, or clean the sludge or blockage at the water inlet.

2. Too low voltage causes the slurry pump speed to decrease, resulting in insufficient slurry pump flow. At this time, check the power supply voltage and adjust it in time.

3. If there is air leakage in the pipeline or there is air in the pump body, please discharge the air in the pipeline in time.

4. Severe wear of the seal ring or impeller will also cause the flow of the slurry pump to be unstable. Check and replace the severely worn seal ring and impeller in time.

5. The depth of the bottom valve is not enough to cause air to enter when pumping. The depth of the bottom valve should be adjusted according to the suction stroke of the slurry pump.

6. If the slurry pump works normally within a period of time after starting, but the current gradually decreases and the flow is obviously insufficient, this problem still occurs after restarting the normal operation for a period of time, mostly because the slurry or other debris is accumulating in the suction pipe. Cavitation occurs in the slurry pump. When it is more serious, there will be loud noise in the slurry pump and obvious vibration of the pump head. At this time, the front pool and suction pipe should be thoroughly cleaned, and the length below the elbow should be reduced, or a stirring device should be added to reduce The slurry settles.

Slurry Pump

Slurry Pump

How to solve the cavitation phenomenon of the slurry pump?

At a certain temperature, when the liquid pressure drops below the saturated pressure, boiling vaporization occurs. This is the characteristic of the liquid itself. At a certain temperature, the saturated pressure is constant, and it increases with the temperature.

For Centrifugal Pumps such as slurry pumps, the suction pressure can be reduced to make the liquid suck into the pump. When the suction pressure is lower than the saturated air pressure corresponding to the water temperature, the sucked liquid will undergo a vaporization reaction. The bubbles formed by gasification gather in the low pressure position in the slurry pump, that is, the back of the blade above the impeller inlet. As the surrounding liquid flows outward, the impact of the liquid will cause noise and vibration. If this happens, the impeller will be eroded. damage.

Generally speaking, the measures to solve the cavitation phenomenon are:

1. Control the suction liquid surface pressure to prevent the liquid surface pressure from being too low.

2. Control the flow rate of the suction port to make the slurry pump work under the specified beat volume.

3. Appropriately reduce the installation height of the slurry pump.

4. The suction valve is open enough, and the filter screen is cleaned frequently.

How to solve the failure of the slurry pump seal?

In different stages of operation, the reasons for the failure of the Slurry Pump seal are different, and then we will analyze them one by one.

1. The slurry pump leaked during the assembly process

The slurry pump is prone to problems during the installation process. It is generally necessary to observe whether the slurry pump is leaking through a static pressure test. When the leakage is small, there is a problem with the moving ring or static ring sealing ring in the small shift. If the leakage is large, it is There are problems with the dynamic and static ring friction pairs. The leaking medium is sprayed along the axial direction, which is mostly the problem of the moving ring seal. If the leaking medium is sprayed around or leaks from the water cooling port, most of the static ring seals have problems. At this time, you should carefully observe and determine the problem and proceed in time Adjustment.

2. Leakage during test operation of slurry pump

After the static pressure test, the reason for the leakage of the slurry pump is generally caused by the damage of the dynamic and static ring friction pairs. There are many reasons for this phenomenon, generally: axial force caused by abnormal phenomena such as cavitation, evacuation, holding pressure, excessive compression when installing the seal, too tight or too loose moving or static seals, There are reasons such as particles in the working medium entering the friction pair. The main solution is to re-disassemble and replace the seal.

3. Sudden leakage during normal operation of slurry pump

In this case, a few are caused by normal wear or the service life of the slurry pump, but most of them are caused by changes in working conditions or improper operation and maintenance. The main reasons are: evacuating cavitation or holding the pressure for a long time, the actual output is too small, the sealed cooling water is interrupted, the operation is stopped for a long time and the car is restarted, the corrosive, polymerizable or gelling substances in the medium increase, and the slurry The temperature of the working environment of the pump changes drastically, and the working conditions are frequently adjusted. In the process of using the slurry pump, pay attention to the use specifications. The shaft seal water must be connected before use, and the pump can be turned off after five minutes of stopping. If it is out of service for a long time, clean the pump cavity and mechanical seal with clean water before shutting down. , Manual cranking when restarting, prolong the service life of slurry pump.

The above slurry pump manufacturer summarizes some common problems in the use of slurry pumps. In order to avoid problems during use, the use process of slurry pumps should be standardized, and regular inspections should be performed to find out when abnormal conditions occur. Reasons and timely adjustments can ensure the normal use of equipment and the normal operation of the plant. In addition, the company also provides mud pumps, please feel free to contact if necessary.