In an engineering work there is a need for designing safer products and structures. Safety engineering also involve improving the safety of work sites, manufacturing facilities and products as safety standard change. The principles of safety engineering are to identify potential safety risks and mitigate them Mitigation includes reducing the odds of accidents occurring or reducing the severity of an accident once it occurs. This process is accomplished by changing the product design to prevent dangerous failures from occurring. Safety measures also are added to protect people if a hazard does occur.