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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 28 Simulated leak testing Simulated leak testing is carried out to determine the extent of a potentially flammable zone in the event of a leak. This testing must only be carried out by a competent person. The test work should comply with EN60079‐10‐1 Explosive atmospheres – Classification of areas – explosive gas atmospheres. The procedure below summarises the process, reference should be made to the standard for full information. Step 2.1 Identify potential leak location(s). Step 2.2 Calculate the release rate from EN60079‐10‐1 (Explosive atmospheres – Classification of areas – explosive gas atmospheres, Annex A) for each location. The following needs to be determined: The hole size of the leak; Whether the release will be liquid or gas ; The maximum pressure and temperature of the refrigerant at the point of leakage. Step 2.3 Decide whether there will be air flow. If fans run permanently then they can run during the test. If fans switch off when the refrigeration system is off (on temperature for example) they should not be run during the test, i.e. testing is based on worst case scenario. Step 2.4 Carry out the leak simulation test, measuring the HC concentration where there are sources of ignition and around the system to find the extent of the potentially flammable zone (area classification). Step 2.5 Record the test work in a technical file. The leak simulation testing should be carried out in an environment similar to that where the system will be located. Consideration should be given to room size and adjacent equipment with regards to ignition sources during the testing.PDF Image | Alternative Refrigerants
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