b)
Air purification system. The air purification system consists of: Purification system: removing CO2 by means of sodium hydroxide cartridges Renewal system: bleeding O2 from oxygen flasks. A man when breathing, creates 30 liters/hour of CO2 and needs the same amount of O2. The air purification system maintains the CO2 content at 1.5% level and O2 content at 17.5%. CO2 content above 2% is injurious. The estimation of time, when 1.5% CO2 content in 400 m³ of air in the boat will be reached: 37 men creates per hour: 37 x 30 x 100/400000 = 0.28% CO2 / hour So 1.5% CO2 content will be reached after 5 hours 20 minutes. The measurement of CO2 and O2 concentration is made by means of Orsat devices, first time after 4 hours of submerged cruise. Moreover there are CO2 sampling tubes to detect carbon dioxide content above 1.5%.
- my math is suspect, but I come up with about 4 hours for 50 crewman. If way off, I hang my head in shame ... lol