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Posted By prads
Can someone explain me the term 'Fail Safe Design'? If possible examples of 'fail passive & fail active' categories.
Regards,
P
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Posted By safety medic
Prads,
Fail safe is where a device or plant operates into a safe mode when it fails.
For example if a machine develops a fault, it shuts down.
Passive would describe the above where something stops as a result of the failure.
Active would be where the failure kicks in another mechanism such as a guard to prevent the danger.
Regards
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Rank: Guest
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Posted By Colin
In reality 'Fail Safe' should be interpreted as 'Fail to Safe' as no design may be said to be inherently 'Fail Safe'.
Fail to safe means that, under failure conditions, the component/device/machine automatically reverts to its safe condition. In the case of an electrically released solenoid brake the brake shoes automatically fall onto the drum/disk should the power be disconnected.
A passive safety component is one that is inherently safe, which means that no external action or monitoring is required to initiate its safety function under failure conditions.
Conversely, an active safety component requires external action to initiate its safety function under fault conditions. The external action may be in the form of human intervention i.e. stop switch operation, or automatic through detection of excess speed/pressure/load, etc.
A good deal of overlap between the two often arises.
Regards
Colin.
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