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This is a calculated value, and is sometimes referred to, for the sake of clarity, as a realized factor of safety. A constant required value, imposed by law, standard, specification, contract or custom, to which a structure must conform or exceed. This can be referred to as a design factor, design factor of safety or required factor of safety.
The safety factor applied to the load will typically ensure that in 95% of times the actual load will be smaller than the design load, while the factor applied to the strength ensures that 95% of times the actual strength will be higher than the design strength. The safety factors for material strength vary depending on the material and the use ...
The margin represents the targeted range the system is being designed to operate in to safely avoid the upper and lower performance bounds. These margins account for aspects such as the design safety factor the system is being developed to as well as the confidence level in that safety factor.
Load and Resistance Factor Design (LRFD), a Limit States Design implementation, and; Allowable Strength Design (ASD), a method where the nominal strength is divided by a safety factor to determine the allowable strength. This allowable strength is required to equal or exceed the required strength for a set of ASD load combinations.
Permissible stress design is a design philosophy used by mechanical engineers and civil engineers. The civil designer ensures that the stresses developed in a structure due to service loads do not exceed the elastic limit. This limit is usually determined by ensuring that stresses remain within the limits through the use of factors of safety.
For pipelines, this value is derived from Barlow's Formula, which takes into account wall thickness, diameter, allowable stress (which is a function of the material used), and a safety factor. The MAOP is less than the MAWP (maximum allowable working pressure).
A safety factor is often included in designs because of concerns about: Operational temperature and pressure of the parts or assembly. Wear. Deflection of components after assembly. The possibility or probability that the parts are slightly out of specification (but passed inspection).
As, by definition, the design load times the factor of safety is the failure load. 128.158.1.166 17:50, 28 July 2009 (UTC) There is nothing unclear about the difference between factor of safety and design factor in this article, as read by a Colorado and Texas licensed professional engineer with three engineering degrees.