Common causes of in-service failure for E.O.T Crane wheel
There is
mainly three cause of failure
- Design problems
- Welding defects
- Service condition and way of usingÂ
Design problems
Fracture
due to design problem can be seen in overloading that will produce the
overstress in the componentsÂ
Welding defects
There are
some welding defects such as
- Porosity
- Inclusion
- Cracking
- Undercutting
- Lamellar tearingÂ
Failure due to inappropriate maintenance
Maintenance
indicates the following tasks as followingÂ
- 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 maintenanceÂ
- 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 temperatureÂ
Failure due to faults in manufactureÂ
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 suitableÂ
- 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 layoutÂ
- Not design as per the requirement of work
- Components used under quality and capacity
- No provision for safetyÂ
- No provision for conditional monitoring such as pressure gauge, oil gauge & temperature gaugeÂ
Failure due to changes in service condition
Changes in
service condition can lead the failure of the equipmentÂ
TemperatureÂ
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.Â
Due to
increase in temperature deflection and elongation might be possible.Â
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.Â
Loading
Excessive
loading of equipments’ will lead to breakdown due to overstress and vibrations.Â
Environment
Dirty
environment will lead the frequency of breakdown. For example in case of hydraulic
power pack if 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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