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According to SOLAS II-2/10, the total fire pump capacity of cargo ships is 4/3 of the capacity of one bilge pump of a passenger ship of the same size, but need not exceed 180 m³/h. Each pump may not be less than 80% of the total ÷ number of pumps or less than 25 m³/h; the emergency pump is 40% of the total (min. 25 m³/h). On cargo ships the fire main must be sized to carry 140 m³/h. Hydrant pressure is 0.27 N/mm² for 6000 GT and above and 0.25 N/mm² below.
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