Safe-life design
Encyclopedia
In safe-life design products are designed to survive a specific design life
with a chosen reserve.
The Safe-life design technique is employed in critical systems which are either very difficult to repair or may cause severe damage to life and property. These systems are designed to work for years without requirement of any repairs.
The drawback is that products designed with a safe-life approach are overdimensioned, which may be uneconomical.
In order to maintain the designed safety, they will have to be replaced after the design life
has expired, while they may still have a considerable life ahead of them.
To counter these drawbacks, alternative design philosophies like fail-safe design
and fault-tolerant design
were developed.
Design life
The design life of a component or product is the period of time during which the item is expected by its designers to work within its specified parameters; in other words, the life expectancy of the item...
with a chosen reserve.
The Safe-life design technique is employed in critical systems which are either very difficult to repair or may cause severe damage to life and property. These systems are designed to work for years without requirement of any repairs.
The drawback is that products designed with a safe-life approach are overdimensioned, which may be uneconomical.
In order to maintain the designed safety, they will have to be replaced after the design life
Design life
The design life of a component or product is the period of time during which the item is expected by its designers to work within its specified parameters; in other words, the life expectancy of the item...
has expired, while they may still have a considerable life ahead of them.
To counter these drawbacks, alternative design philosophies like fail-safe design
Fail-safe
A fail-safe or fail-secure device is one that, in the event of failure, responds in a way that will cause no harm, or at least a minimum of harm, to other devices or danger to personnel....
and fault-tolerant design
Fault-tolerant design
In engineering, fault-tolerant design is a design that enables a system to continue operation, possibly at a reduced level , rather than failing completely, when some part of the system fails...
were developed.