margin of safety


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margin of safety

[′mär·jən əv ′sāf·tē]
(design engineering)
A design criterion, usually the ratio between the load that would cause failure of a member or structure and the load that is imposed upon it in service.

factor of safety, safety factor

1. The ratio of the ultimate stress of a structure or pressure vessel to the design working stress.
2. The ratio of the ultimate breaking strength of a member or piece of material or equipment to the actual working stress or safe load when in use.

margin of safety

The safety factor, expressed either in a percentage or a ratio, by which the ultimate failing load of components exceeds the design limit load.
References in periodicals archive ?
If a situation occurs where either because of a long cuff-tip length on the selected tube or because the patient has a very short left main bronchus, the margin of safety is less than 10 mm, this is a strong argument for inspection of the final position of the bronchial segment of double-lumen tube with a fibreoptic bronchoscope even if this is not the anaesthetist's routine practice.
Most noteworthy in the current analysis is the dramatic improvement in Connie Lee's margin of safety to a range of 1.
However, researchers who study the effects of speed and gravity on Air Force fighter pilots say humans have a five-second margin of safety before losing consciousness when exposed to rapid acceleration or deceleration.
The federal law, which ``we interpret as requiring the EPA to set air quality standards at the level that is 'requisite' - that is, not lower or higher than is necessary - to protect the public health with an adequate margin of safety, fits comfortably within the scope of discretion permitted by our precedent,'' Scalia wrote.
Sounds above 16 kHz alarm crickets, giving them a wide margin of safety, Robert A.
I'm saying that it certainly reduces the airport's margin of safety.
According to the July 31, 2006 trustee report, the interest coverage (IC) tests for each class have decreased since close but still retain a margin of safety above their minimum threshold requirements.
While legal covenants are in line with other regional wholesale utilities, the authority's cost of service methodology leaves little margin of safety.
This performance provides an 18% margin of safety over the specified thermal resistance.
Cliver felt that if it took 10 minutes for a problem to occur, he had a good margin of safety in recommending 5 minutes.