By Paul Tait, Sue Cox
This name examines the recommendations of structures reliability and the ideas to be had for making a choice on either 'technical' and 'human' chance and threat. Emphasis is put on technical platforms and human elements and the expanding value of mental elements within the total overview of safety.
This variation comprises fabric that displays the truth that the software of danger evaluation has been taken up by means of many business and advertisement sectors because the first variation.
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Additional info for Safety, Reliability and Risk Management, Second Edition: An Integrated Approach
Sample text
The situation with the electrical switch is less clear. The fact that the contacts are opened when pressure is lost makes the switch fail to safety if the electrical wires or connectors are broken. On the other hand, failure of the spring in the switch could leave the contact open or closed depending on the exact form of failure. We assume in the circumstances that failure to safety will occur in 75% of occasions, failure to danger in the other 25%. 1. 3 Schematic dlagram of a pressure swltcb. 5 210-6.
Greater reliability 37 Furthermore, many navigation systems use both gyro- and magnetic compass-based elements. We will come across a number of examples of the use of diversity in the next few pages where several high integrity systems are described. Examples of high integrity equipment The nuclear industry took a strong lead in the development of high integrity systems and in the United Kingdom the Windscale incident in 1957 led to a further strengthening of efforts in this direction (Green and Bourne, 1966).
The intrinsic solution is the better one, and is used wherever possible. The extrinsic solution makes use of 'add-on' features designed either to make failures less likely or to lessen their effects. Many examples of both the intrinsic and the extrinsic approach to safety are to be found in the field of chemical engineering. For example, many of the products of the chemical industry are relatively inert and chemically stable, but they may be produced in a multi-step process involving highly reactive or toxic intermediates.