Loss control credit factors

The next step is to apply a number of loss control credit factors such as process control (emergency power, cooling, explosion control, emergency shutdown, computer control, inert gas, operating procedures, reactive chemical reviews), material isolation (remote control valves, blowdown, drainage, interlocks) and fire protection (leak detection, buried tanks, fire water supply, sprinkler systems, water curtains, foam, cable protection). The credit factors are combined and appHed to the fire and explosion index value to result in a net index. 

To assess the potential hazard of a new plant, the index can be calculated after the Piping and Instrumentation and equipment layout diagrams have been prepared. In earlier versions of the guide the index was then used to determine what preventative and protection measures were needed, see Dow (1973). In the current version the preventative and protection measures, that have been incorporated in the plant design to reduce the hazard-are taken into account when assessing the potential loss in the form of loss control credit factors. 

Only a brief outline of the method used to calculate the Dow F El will be given in this section. The full guide should be studied before applying the technique to a particular process. Judgement, based on experience with similar processes, is needed to decide the magnitude of the various factors used in the calculation of the index, and the loss control credit factors. 

Loss Control Credit Factor = C) X C2 X C3 = (Enter on line 7 below)... 

Table 9.5. Loss control credit factors 1. Process Control Credit Factor (Ci)...

The Dow method can be extended to estimate the probable financial loss due to an accident. This involves the application of a series of loss control credit factors, shown on the second page of Figure 2-9. 

Figure 24.2 Loss Control Credit Factors (Form reproduced with permission of the American Institute of Chemical Engineers. Copyright 1994 AIChE. All rights reserved. Exanple used by permission of SACHE (www.aiche.org sache), a conponent of the Center for Chemical Process Safety providing instructional materials to member chemical engineering departments throughout the world.)...

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