No matter how scientific and technological engineering is widely known to be, that is, the use of advanced computers and advanced calculators. there are various aspects of engineering which require the use of some safety measures. For instance, in civil engineering, civil engineers are required to wear safety attire like the helmet. This is veryvery important especially in This branch of engineering because it has to do mainly with building development and construction work. Safety engineering is also an applied science related to industrial engineering.

Analysis Techniques

Analysis techniques are mainly used to find out the various casual dependencies between a hazard on a system level and failures of individual components. These Techniques can be grouped into two, they are; qualitative and quantitative Techniques.  The qualitative aspect  focuses really on what must go wrong for a hazard to occur on a particular system. While the quantitative aspect focuses on the estimation on the severity of the hazard.

Safety Analysis  

There are two main types of  safety analysis, they are;

Failure modes and effects analysis and the fault tree analysis

  When preventing failures, extra and redundant parts are added to the system when failure is found. And also When trying to contain some failures, a practice known as containing failure is used, this practice is used to plan for the failure of safety systems through the use of isolation methods.

REFERENCE :

http://en.Wikipedia.org/wiki/safety_engineering