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並前往https://www.ppsa.org/assets/SafetyMaterialsandGuide/fm_dry_sprinkler_system_flushing_investigations.pdf

Dry Sprinkler Systems Flushing Investigations - PPSA.org

piping or sprinklers on dry-pipe sprinkler systems were plugged with pipe scale (rust formed in the sprinkler piping), mud, stones or other foreign.

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