beaver_01
Chemical
- Nov 1, 2022
- 4
Hi all,
Should pressure relief valve be considered as primary or secondary grade of release in IEC 60079-10-1? Section B.2.3(d) and B.2.4(d) said that relief valves can be primary or secondary depending on whether they are expected to lift during normal operation or not. My understanding is that relief valve is not expected to lift during normal operation, thus it should be secondary grade of release. We see many time that the relief valve usually have both Zone 1 and Zone 2.
According to IP-15 section 3.6.2.5, pressure relief valve is considered as secondary grade of release. To cover any fugitive emissions that may occur, a Zone 1 of nominal 1 m radius should be placed around the end of any discharge point. Where a process relief valve lifts at its design intent the extent of the resultant Zone 2 should be determined.
In summary, my conclusion is that, for relief valve, there will always be Zone 1 to cover the fugitive emission (1m or 1.5m) and Zone 2 to be determined by individual standards. Is this statement true?
Should pressure relief valve be considered as primary or secondary grade of release in IEC 60079-10-1? Section B.2.3(d) and B.2.4(d) said that relief valves can be primary or secondary depending on whether they are expected to lift during normal operation or not. My understanding is that relief valve is not expected to lift during normal operation, thus it should be secondary grade of release. We see many time that the relief valve usually have both Zone 1 and Zone 2.
According to IP-15 section 3.6.2.5, pressure relief valve is considered as secondary grade of release. To cover any fugitive emissions that may occur, a Zone 1 of nominal 1 m radius should be placed around the end of any discharge point. Where a process relief valve lifts at its design intent the extent of the resultant Zone 2 should be determined.
In summary, my conclusion is that, for relief valve, there will always be Zone 1 to cover the fugitive emission (1m or 1.5m) and Zone 2 to be determined by individual standards. Is this statement true?
