Today we will take a look at the froth pump will encounter what kind of problems, encounter these problems, we should do?


First of all, one of our common problems is that the shaft power of the froth pump is too large, which will cause friction in the foam pump, misalignment or imbalance between the motor shaft and the pump shaft, which will also lead to bearing damage, excessive flow of the froht pump, and too tight belt of the driving device.



At this time, the corresponding solution is to eliminate friction, adjust the motor shaft and pump shaft, replace the new bearing, adjust the running condition of the foam pump, adjust the belt, so that the above problems will be solved.


froth pump also often encounter the problem is that the bearing of the froht pump is overheating, the bearing is easy to damage, replace the new bearing, the bearing grease of the froth pump is too much or too little, add grease to be appropriate, there is debris in the grease, replace the new grease.


The bearing life of the froth pump is too short, the motor end and the pump shaft are not aligned or uneven phenomenon occurs, the motor shaft and the pump shaft can be adjusted, the shaft of the froth pump is bent, it is necessary to replace the new pump shaft, the friction in the froth pump or the impeller is out of balance, we need to eliminate the friction, and then replace the new impeller. When there are foreign bodies in the bearing of the froth pump or improper grease, we can clean the shaft.

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The role of the slurry pump is to transport the slurry out. Then it conveys the distance height and so on determines its head. Sometimes we will need high head slurry pump to slurry out. So what are the high head pumps. CNSME to bring you to talk about the high head slurry pump series.



1. HH type slurry pump. This is a high head slurry pump developed according to the AH series. Its highest head can reach about 100 meters. Double pump shell structure, the overflow parts are made of high chrome alloy.



2. ZJ type slurry pump. This series of slurry pump is to adjust the head by changing the size of the impeller. Its highest head can also reach more than 100 meters in some models.



3. ZGB series slurry pump. This series of slurry pump is a high efficiency, large flow, high head slurry pump. And if the head of a single pump can not reach, the series of slurry pumps can also be used in series to achieve the required head.



These three series of slurry pumps are the high head slurry pumps that CNSME has organized for you. Hope to help you

Common faults and solutions of abrasion resistant and explosion proof mining multistage pumps


No liquid coming out, violent jumping of the pressure gauge, abnormal internal sound:

Too big of the slurry weight concentration --- dilute the slurry;

Serious wear on the impeller and volute --- Replace them with new and unused ones;

Feeding slurry quantity lower than required --- Increase feeding slurry or decrease slurry discharge;

Clogging of suction pipeline or insufficient valve open --- Clean the pipeline or open the suction valve

Not enough slurry input --- Increase feeding slurry input or add clean water temporarily;

Air entering at the inlet --- Check the reasons why there’s air coming in

Motor Overloaded

Too big of the slurry weight concentration --- Lower the slurry weight concentration;

Too big of the flowrate --- Increase discharge pipeline friction resistance

Vibration and noise

Cavitation --- Find out the reason and solve it;

Non-concentricity of the pump shaft and the motor shaft --- Adjust the shafts to be concentric;

Bearings damaged --- Replace with new bearings;

Too big of the medium flowrate, or too high temperature --- Increase discharge pipeline friction resistance;

Loosened fasteners or foundation --- Tighten the fasteners, strengthen the foundation

Leakage of shaft sealing water

Too big pressure of the shaft sealing water --- Adjust the shaft sealing pressure;

Wear of the packing rings --- Replace with new packings;

Gland assembly not tightened or not evenly tightened --- Adjust gland bolt

Slurry leakage of the shaft seal

Serious wear of the shaft sleeve --- Change the shaft sleeve;

No shaft sealing water or shaft sealing water pressure too small --- Add shaft sealing or increase its pressure

Insufficient flow or head

Impeller and Volute seriously worn out --- Replace with new ones;

Pipeline NPSH lower than pump’s NPSHr --- Improve pipeline devices and increase its NPSH;

Too big of the slurry weight concentration --- Lower the weight concentration or change to a bigger pump;

Scarring inside the discharge pipe --- Remove it

Overheated bearings

The pump bears the weight of the pipeline --- Adjust the stand of the pipeline, no pipeline weight bearing on the pump is allowed;

Vibration --- Check and handle vibration;

Non-concentricity of the pump shaft and the motor shaft --- Adjust the shafts to be concentric;

Inappropriate use of lubrication or lubrication gone bad --- Change the lubrication grease;

Bearings damaged --- Change with new bearings

Short packing life

Bad material of the packings --- Change to better material;

Shaft sealing water turned off --- Turn on the shaft sealing water

Oil leakage of the bearing assembly

Oil level too high --- Lower the oil level;

Failure of the rubber seals --- Replace with new ones

Pump not rotating

Volute chamber clogged by hard sediments --- Clear the sediments;

Impeller rotates out due to reverse rotation and the impeller and squeezed with the throatbush
Speed regulation of the inverter must be set on its two terminals;

b. Adjust the adjusting screw of the bearing housing, and backward adjust the pump shaft, separate the impeller from the throatbush, and turn the shaft to tighten the impeller.


XI. Water leakage of the pump head


1) Rubber Seals are not well pressed --- Re-assemble or tighten them


XII. Not rotating of Water Retainer


1) Deformation - Machine the outer circle of the water retainer off by 0.5-0.8mm