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PRACTICAL WORK №1
EXPERT METHOD OF RISK DETERMINATION
1 OUTCOMES
Become familiar with the expert method of risk assessment in particular,
learn to identify complex (generalized) index, which reflects the level of safety of a
certain process or product
2 DURATION OF CLASS
The class duration is two academic hours
3 BASIC THEORY
Expert risk assessment is based on the use of expert’s and specialist’s
opinions can be attributed to subjective methods to determine the level of safety.
This method should be used to assess dangerous situations that cannot be done by
objective methods (for example, for evaluation of aesthetic parameters) by direct
measurements of separate parameters. Experienced specialists in Safety,
Ergonomics, Technical Aesthetics and Industrial Hygiene who carry out the testing
of technical process or a manufactured article and also experts from specialized
research and design institutes can be attracted to express their expert opinion.
The evaluation of indicators is performed by experts independently.
Block diagram of the safety performance consists of three levels:
- indicators of Level 1 – single safety indicators;
- indicators of Level 2 – a group indicators of safety, each of which
describes a homogeneous group safety parameters;
- the indicator of Level 3 – complex (generalized) safety indicator that
characterize the set of all safety properties of a product or process.
The group process indicators include the following indicators: hygienic,
anthropometric, physiological, psychological and aesthetic. Single indicators
characterize the safety parameters that relate to each of the above stated groups.
The generalized indicator is determined from the equation given below:
N
К j group
K general j 1 , (1.1)
N
where K j group – group indicator, which is determined for each group of indicators.
N – number of group indicators.
The value of the generalized indicator, which is less than one, suggests that
evaluated process does not reach the base level according to the safety of usage. In
conclusion, the experts give a qualitative assessment of the safety level by the
magnitude of a generalized indicator:
K=0.2–0.4 – extremely low;
K=0.5–0.9 – unsatisfactory;
K=1.0 – permissible;
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