Maintainability of large pump units

Pump unit belongs to maintainability system, evaluate its performance, not only to evaluate the level of its operational efficiency, but also to evaluate the reliability index.Real reliability index in addition to requiring unit operation has high reliability, but also requires the occurrence of unit Failure, in a relatively short period of time, under certain conditions (including manpower, personnel technical level, spare parts, tools and equipment), more economical maintenance of the pump unit to restore a good working condition, which requires the pump unit has better Maintainability. General reliability includes maintenance.

1, maintenance of large-scale water pump units

1.1, maintenance of the elements

Maintainability is the product easy to maintain the characteristics of the maintenance of good or bad, mainly depends on the maintenance of the product design level for large-scale pump units, maintenance is the water pump unit under the specified conditions, within the stipulated time, according to the provisions Maintenance and restoration of its ability to provide good conditions when expressed and measured in terms of probability that the degree of maintenance is the degree of maintenance of the pump unit has five elements:

â‘  "maintenance object", including pumps, motors, transmissions and other equipment.

â‘¡ "Conditions", mainly refers to the maintenance of the system, the maintenance of institutions and places, maintenance personnel maintenance and repair tools and equipment, equipment, technical information and other conditions.

â‘¢ "prescribed procedures and methods", according to the technical documentation of the type of maintenance work, steps and methods.

â‘£ "prescribed time", refers to the provisions of the maintenance time.

⑤ "prescribed function" refers to the pump unit to achieve pumping and maintenance to achieve the required flow, lift and efficiency of the expected function.

Maintainability engineering can be defined as: a series of design, development, production and test work carried out in order to meet the maintenance requirements of the product.In fact, in addition to the maintenance of the nature of the demonstration and determination of maintenance requirements, including maintenance of supervision And control, maintenance of the design and analysis and maintenance of the test and evaluation, the task is to improve product maintenance.

1.2, to carry out the necessity of the maintenance of the pump unit

At present, the maintenance system developed in our country is far below the international level, the mechanical equipment to be manufactured needs a short maintenance period, a long downtime, a high proportion of overhaul, and a maintenance cost High, causing huge human, material and financial losses.Maintainability of large-scale pump units related to the large pump station drought, drainage, water transfer function can play a normal, related to people's lives and property safety.Especially the East Line of South-to-North Water Diversion Project, a large amount of investment, a wide range of impact, cascade pump unit average annual run time in 5000 ~ 6000h, long running time, short maintenance time, heavy maintenance tasks.If a pumping station pump unit failure, pumping flow can not Be guaranteed, it will affect the normal operation of other ladder pump stations and even the entire water transfer project.Therefore, the reliable maintenance of the pump unit is the first issue to be considered.

Due to space limitations, parts of the second, third and fourth chapters of the article are omitted. For detailed articles, please e-mail the author.

5 Conclusion

Maintenance of large water pump unit directly affect the maintenance time, repair quality and maintenance costs. Large-scale pump unit failure forms are: motor thrust tile burning, water pump guide bearing wear, pump cavitation, etc. Vertical half shaft pump unit has more Good maintainability.Repairability, testability and maintenance system should be improved to improve and maintain the water pump unit.