In a fixed CO2 fire extinguishing system where pressure from pilot cylinders is used to release the CO2 from the main bank of 20 cylinders, what is the minimum number of required pilot cylinders?
• Fixed CO₂ fire extinguishing systems on ships and how they are actuated • The role of pilot cylinders versus the main CO₂ cylinders • Safety/redundancy requirements in fire-extinguishing system design
• Think about what would happen if one pilot cylinder failed—how many would you want to still ensure release of the main bank? • Consider whether regulations tend to require single, double, or multiple redundancy for critical safety systems like fixed CO₂ • Ask yourself if the minimum number of pilot cylinders is usually just enough to operate the system once, or enough to provide backup in case of malfunction
• Verify in your study materials what SOLAS or classification rules say about minimum pilot cylinder arrangements for CO₂ systems serving machinery spaces • Check whether the required number is related to the size of the main bank (20 cylinders) or is a fixed minimum regardless of bank size • Confirm if there is a requirement that the system can still be operated if one pilot cylinder is out of service or loses pressure
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