Common causes of in-service failurefor E.O.T Crane wheel
There is mainly three cause of failure
- Design problems
- Welding defects
- Service condition and way of using
Design problems
Fracture due to design problem can be seen in overloading that will produce the overstress in the components
Welding defects
There are some welding defects such as
- Porosity
- Inclusion
- Cracking
- Undercutting
- Lamellar tearing
Failure due to inappropriate maintenance
Maintenance indicates the following tasks as following
- Servicing
- Repairing
- Routine inspection
- Replacement
- Required up gradation or modification
There are several types of maintenance such as planned maintenance or preventive maintenance, Breakdown maintenance. Inappropriate maintenance indicates the following points.
- Routine inspection of healthiness of machines is not suitable
- There is no preventive maintenance
- There is no planning of maintenance
- There is no planning of spare management
Failure due to inappropriate use
Inappropriate use indicates that equipment's are not using as per the manufacturer guidelines and manuals. There are some points by which we could understand the inappropriate use and these are as mentioned here.- Equipment's are used over the capacity
- Equipment's are used even there were some problems in its components that will lead to major breakdown.
- Equipment's are used over the design pressure and temperature
Failure due to faults in manufacture
Failure due to faults in manufacture could be seen and understand by following points.- Design of components is not suitable
- Material selections are not proper
- Manufacturing process are not suitable
- Tough to carry out the maintenance activities
- There were some components that are Unreachable and could not seen by maintenance team about its operation.
- Not design as per the layout
- Not design as per the requirement of work
- Components used under quality and capacity
- No provision for safety
- No provision for conditional monitoring such as pressure gauge, oil gauge & temperature gauge
Failure due to changes in service condition
Changes in service condition can lead the failure of the equipment
Temperature
Normally we have seen that frequency of failure will be more in summer days due to over temperature of environment or surrounding areas. Due to increase in temperature, the requirement of equipment such as lubrication frequency increases.
Due to increase in temperature deflection and elongation might be possible.
Maintenance team working will be affected due to overheat of surrounding areas and hence maintenance practices will also be affected due to worm surrounding areas.
Loading
Excessive loading of equipments’ will lead to breakdown due to overstress and vibrations.
Environment
肮脏的环境会导致频率of breakdown. For example in case ofhydraulic power packif the environment is dirty then it will affect the oil temperature of hydraulic tank as proper cooling will not be possible.
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