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hunan neptune pump

The maintenance and repair of stainless steel multistage cen

Source:未知|Popularity:0|release date:2020-05-11 14:08:23
Multistage centrifugal pumps are machines that transport or supercharge liquids. Now multistage centrifugal pumps represented by self-balancing structures have been widely used in mine drainage, chemical industry, petroleum, metallurgy, light industry, environmental protection, seawater desalination, offshore oil production and other industrial sectors.

1. Reasonable selection of stainless steel multistage centrifugal pump
The technical parameters to measure the performance of the pump are: flow rate, head, cavitation, shaft power, efficiency, etc. The requirements for water pumps are to increase efficiency, reduce energy consumption and make full use of natural energy. Therefore, first of all, the pumps should be suitable for the working conditions when selecting the type before being put into use, and follow the following principles:
1)   . High mechanical reliability, low noise and low vibration.
2)   .Make the type and performance of the selected pump meet the requirements of the process parameters such as flow rate, head, pressure, temperature, cavitation allowance, suction range of the device.
3)   Must meet the requirements of the media characteristics. For pumps that transport flammable, explosive, toxic or precious media, the shaft seal is required to be reliable or a leak-free pump is used. For pumps that transport solid particle media, the convection parts are required to use wear-resistant materials, and if necessary, the shaft seal is washed with clean liquid .
4)   Economically, the total cost of equipment cost, operation cost, maintenance cost and management cost should be considered the lowest.

5)   . The multistage centrifugal pump should have the characteristics of small volume, light weight, high efficiency, simple structure, no pulsation of infusion, stable performance, easy operation and convenient maintenance.

2. Maintenance methods and rules of stainless steel multistage centrifugal pumps
The safe and reliable operation of the pump is closely related to the normal production activities of the enterprise and the development of the enterprise, so the maintenance and maintenance of the pump are also crucial.
1). Common methods of pump maintenance
1.1 Maintenance after accident: When the equipment has already appeared obvious failures and cannot run, it will be shut down for maintenance, and the equipment or parts that are about to be damaged or have been damaged and need to be repaired or updated will be removed. The disadvantage of this maintenance method is that it wastes time and costs a lot. It is also possible that there are endless problems, maintenance personnel are exhausted, one problem has not been completely solved, and another more serious failure has occurred. Needless to say, this maintenance method is very inefficient and undesirable.
1.2 Regular preventive maintenance: This maintenance method is to rush to the site for machine repair at a predetermined time and interval, replace the equipment or repair before the failure occurs. If properly arranged, this option can save resources compared to the maintenance costs after an accident. The disadvantage of this maintenance method is that the improper maintenance schedule will cause unnecessary maintenance, and the intact machine increases the number of dis-assembly, which is easy to cause problems such as a decrease in installation accuracy.
1.3 Predictive maintenance for monitoring equipment: This maintenance method mainly depends on whether there is abnormal mechanical vibration and other abnormal phenomena. If the parameter exceeds the predetermined critical value, it will immediately shut down for maintenance to avoid serious accidents. The implementation of this measurement and early warning program is carried out by maintenance personnel with rich experience and technology. The advantages are obvious. The whole work can be carried out in an orderly manner, there is ample time to buy spare parts, and various spare parts do not need to be purchased in advance. The maintenance goal of this plan is clear, and it is repaired according to the needs, so it can effectively improve production efficiency. This work can also be hired by professional maintenance personnel.
1.4 Active maintenance: perform maintenance after finding the root cause of the accident. It is required to rectify or redesign the defects of the existing equipment to fundamentally eliminate the cause of the failure. This scheme can greatly extend the working life of equipment and save costs. According to the monitoring and forecasting, the hidden dangers of the faults are identified and eliminated in time, and a lot of on-site maintenance is reduced, which can greatly improve the production capacity.
2). Maintenance rules of stainless steel multistage centrifugal pump
The maintenance of stainless steel multistage centrifugal pumps is a more reasonable and effective method based on monitoring and predictive maintenance. Regular preventive maintenance work on stainless steel multistage centrifugal pumps can greatly ensure the optimal operating conditions of the equipment, so regular maintenance is also very necessary. Stainless steel multistage centrifugal pumps are divided into first-level maintenance and second-level maintenance. Generally, the first-level maintenance cycle is one week, and the second-level maintenance cycle can be formulated quarterly or according to the actual frequency of use.

1. Detailed maintenance rules
1) Complete the contents of daily maintenance inspection: check whether the flow rate and head parameters of the pump are abnormal; whether the pump vibration and bearing temperature are abnormal; whether the shaft seal is leaked;
2) Tighten the loose threads of each part, and the damaged equipment is fully equipped;
3) Clean and inspect the motor bearings and add grease;
4) The oil level in the oil bottle is lower than the scale line, add lubricating oil;

5) Check whether the balance pipe is blocked, and if it is blocked, it should be cleaned up in time.
2. Secondary maintenance rules

1) Complete the content of first-level maintenance;
2) Whether the outlet pressure of the pump meets the requirements;
3) Check whether the bearing and oil throw ring in the bearing box are intact, and they should be replaced if they do not meet the requirements;
4) Check whether the leakage of the shaft seal at both ends of the bearing box meets the requirements, and repair or replace if it does not meet the requirements;
5) Check whether the clearance of the impeller wear ring meets the requirements, and if it does not meet the requirements, it should be repaired or replaced;
6) Check the mechanical seal for damage and replace the O-ring;
7) Replace the lubricant in the bearing box;
8) Check the motor bearings and replace if necessary;
9) Check whether the insulation of each top winding of the motor meets the requirements
10) Check the alignment of the coupling;
11) Check the bearing and overall vibration of the pump.