HEAVIER-THAN-AIR GASES & VAPOURS
Open -Air Situations (freely ventilated Process Areas)
- Figures 1 ,2)
- Figures 3 & 4
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- In case of petroleum pipelines (where well-maintained valves, fittings, and meters and in well-ventilated areas or in a pit), Zone 2 A/G shall be 4m in all directions, from the potential leak source. Pit will be considered as Zone 1.
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- Zone 1
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(unless
separated by
a fire wall)
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