wish to submit a reflection. The UNI EN 858-1 paragraph 8.3.3.1.4 describes how the test should be conducted for the effectiveness of prefabricated oil separators. The test is introduced that provides a flow of water contaminated with a defined quantity of oil to the system, equal to what extent this can be covered for the time necessary to change 4 times the volume of the tank. After this time you run the output of the plant and five samples for chemical analysis is undertaken to evaluate the purification performance. Let's take a practical example to understand the volumes of water and oil are put into play. Suppose we want to test a system of 50 lt / sec, which, among other things, represents a rather small size, whereas the rule exempts from testing only facilities capable of handling a range greater than 150 l / sec and castings . The scope then be placed in our facility is 50 lt / sec for about 21 minutes, since the latter calculated from the volume of our tub and the multiplication factor 4. The volume of water that is conivolto in evidence in this period is therefore equal to 64,000 liters that is 64 cubic . These 64 mc are contaminated and then polluted with 320 liters of oil and at best that the system has the performance to be classified in Class I, the concentration of oil at the drain is still a 5 mg / liter to 0.4 liters of oil still which continue to be "inseparable" from the water mass. If then the system falls into class II, and then requires a value to the discharge of 100 mg / lt the amount of residual oil inseparate will be about 7 liters. Do not think so a little 'paradoxical that in order to test the performance of a system should be such high volumes pollute the precious liquid that we all rush to protect??
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