" We chose the quality because the luck had become too expensive. " (Jean Abraham) " In the running in the quality, there is no finishing line. " (David Kearns) " The quality is never an accident; it is always the result of an intelligent effort. " (John Ruskin)

The ammonia is traditionally used in artificial refrigeration: it is used as liquid refrigerant. But asides from its physicochemical properties, toxicological and ecotoxicological, the use of this substance can make incur, in the event of an installation dysfunction, there are several environmental dangers including that of fire, water pollution and especially that of toxic effects on man. Also, the cold stores using ammonia are obligated to conduct a study of risk as the FMECA method.

 

In this type of installation, the raising danger, i.e. the most unfavourable case, with respect to the environment is the salting out of a large quantity of NH3. Generally, the only component outside the installation is the evapocondensor. The example to illustrate the FMECA method relies on this component. The step proceeds in 3 stages: first of all, a qualitative analysis of the failure mechanisms is carried out; then the criticality of the failure is evaluated and finally compensatory measures are proposed.