Commen Problems

Cavitation of the Slurry Pump

Centrifugal slurry pump cavitation principle mainly involves the knowledge of physics, but also involves a small part of the chemical phenomenon.

The cause of cavitation

When the slurry pump is in operation，a portion of the head of the impeller inlet blade is the lowest position of the flow pressure，When the local pressure of the liquid is reduced to a pressure equal to or lower than the vapor pressure at that time，Flow through the Department will occur vaporization, resulting in bubbles. The bubbles are filled with steam and some of the active gases (such as oxygen) that are precipitated from the liquid and scattered into the bubbles. When the bubbles into the pump with the liquid pressure to a higher pressure part，In the bubble around the higher pressure flow,the bubbles are compressed and deformed and crushed, cause huge and belong to the inner explosive nature of the condensation shock.

Cavitation Damage

When the bubble collapse occurs at the wall of pump runner, To generate a micro-jet, which hit the wall at high speed, the formation of local high pressure on the wall,（Up to several hundred megapascals）, the result to a blow to metal material. If the above bubbles continue to occur and collapse，It formed a continuous blow to the metal material，So the metal surface was quickly eroded by fatigue. In addition，due to erosion caused by metal protective film has been destroyed，under the help of condensation heat, the active gas precipitated from the liquid in the bubble reacts with the chemical corrosion of the metal.

Above mentioned bubble formation, development, collapse, so that the flow through the wall was damaged process, known as the pump cavitation.

Daily Maintenance of Dredge Pump

As one of  the biggest dredge pump manufacturer in China, Aier Machinery Equipement Hebei Co., Ltd. has summarized following aspects that to be paid attention when dredge pump is in use of process.

1. Check the Dredge pump piping and the junction of any loose phenomenon. Turn the dredge pump by hand to see if the dredger is flexible.

2. To the bearing body by adding bearing lubricating oil, oil level should be observed in the oil standard center line, the oil should be replaced or replenished on time.

3. Remove the water diversion plug of the Dredge pump body, pouring water (or pulp).

4. Off the gate valve and outlet pressure gauge and inlet vacuum gauge.

5. Start the motor and check the motor rotation is correct or not.

6. Start the motor, when the Dredge pump normal operation，Open the outlet pressure gauge and inlet vacuum pump, as it shows the appropriate pressure, gradually open the gate valve, while checking the motor load situation.

7. Try to control the flow and head of the dredger pump in the range indicated on the label to ensure that the Dredge pump in the most efficient operation, in order to obtain the greatest energy saving effect.

8. Dredge pump in the course of running, the bearing temperature can not exceed the ambient temperature of 35 ℃, the maximum temperature shall not exceed 80 ℃.

9. If the dredger is found to have abnormal sound should immediately stop to check the cause.

10. Regularly check the wear of the sleeve, should be replaced after the larger wear。

11. When the Dredge pump is to be stopped, close the gate valve, the pressure gauge, and then stop the motor.

12. Dredge pump in the first month of work, after 100 hours to replace the oil, then change oil every 500 hour

13. Often adjust the packing gland to ensure that the filling chamber of the container is normal (to drop the drain is appropriate).

14. Dredge pump in the use of the winter season, after turned off, need to remove the lower part of the pump plug and drain the media off. To prevent cracking.

15. Dredge pump long-time stand by, should be disassembled, wipe dry, apply the rotating parts and joints to grease. Take good care of them.

Selection and Design of Slurry Pump

Selection of Slurry Pump has a great impact to slurry pump life and operating stability.

A scientific and rational selection of design，Will affect your slurry pump if able to achieve the best efficient operation.

There are three characteristics of efficient operation of the slurry pump:

First, Slurry pump operation efficiency is very high, less loss.

Second, Pump life of the flow components is relatively long, saving production costs.

Third, The entire industrial and mining system stable operation, not because of the operation of the pump and affect the work of the entire industrial and mining system. So at the pre-production, the user must choose the ability and strength of the company for the year selected slurry pump selection design. This will bring you great overall benefits. Then how many factors to evaluate the quality of a slurry pump manufacturer? Mr. Lv, Chief Engineer from Hebei Delin Machinery Co., Ltd. give you some reference factors today:

1. When slurry pump factory to choose model design for customers, they all use their Selection Guide. The scientificity of the data in this manual completely determines whether the selected pump type is scientific.

2. Experienced engineers. It will be very important for the selection engineers who have many years of experience, because for many years to participate in industrial and mining design and selection of engineers have a deep combat experience, very experienced for the needs of customers, for the mining situation and the operation of the pump has a strong combat experience. So they will be scientific and reasonable in the design selection.

3. The company's overall design capability. It looks like it`s not near to design selection, but if you choose a company lack of design ability, it will also affect your design selection quality. Because industry can be considered as a system, not just a pump problem，but the whole industrial system, will involve many devices running in the system, so the company in the choice of slurry pump models must have the overall system design capabilities.

Aier Machinery Equipement Hebei Co., Ltd is ready to provide you with the perfect pre-sale, sale, after-sales service.