ISO 16852:2016 pdf free

ISO 16852:2016 pdf free.Flame arresters一Performance requirements, test methods and limits for use
Stabilized burning after ignition creates additional hazards in applications where there could be a continuous flow of the explosive mixture towards the unprotected side of the flame arrester. The following situations shall be taken into account:
一if the flow of the explosive mixture can be stopped within a specific time that is between 1 min and 30 min, flame arresters which, when tested in accordance with 7.3.4, prevent flame transmission during that period of stabilized burning are suitable for that hazard, and they are classified as safe against short time burning;
NOTE Bypassing, sufficient diluting or inerting are measures equivalent to stopping the flow.
一if the flow of the explosive mixture cannot be stopped or, for operational reasons, is not intended to be stopped within 30 min, flame arresters which, when tested in accordance with 7.3.5, prevent flame transmission for this type of stabilized burning are suitable for that hazard, and they are classified as safe against endurance burning.
The pressure drop across the flame arrester shall be tested before and after flame transmission tests at a volume flow that is suitable for identifying any alteration (deformation) of the flame arrester,particularly of the flame arrester element. After flame transmission testing, the pressure drop shall not differ by more than 20 % from the value measured at the same flow rate before that testing. After short time burn test and after endurance burn test, no additional flow measurement is required.
The flow capacity of in-line flame arresters shall be recorded in accordance with A.2 in a type test. The flow capacity of end-of-line flame arresters shall be recorded in accordance with A.3 in a type test.
The flow capacity of end-of-line flame arresters directly combined with or integrated into pressure and/or vacuum valves shall be recorded in accordance with A.3. Pressure and/or vacuum valves manufactured for different pressure settings shall be tested at the lowest and the highest set pressure and for intermediate set pressures≤1 kPa apart.ISO 16852 pdf free download.