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Defines specific fire zones (e.g., 7.6m vertically and 12.5m horizontally) to determine how much heat equipment might absorb during a fire.
titled "Pressure-relieving and Depressuring Systems" is available for viewing and download on ResearchGate : Multiple versions, including the 2007 5th Edition and newer updates, are hosted on api 521 free pdf
[Insert actual download link or instructions on how to access the free PDF] Defines specific fire zones (e