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My last ship had two 20K HP B&W diesels. Never had a scavenge fire but it fell to me to periodically check the bank of CO2 cylinders there to smother the fire if it ever happened.
Why?
Well we had a device using a radio-active isotope and geiger-counter which fitted around a cylinder and by sliding the probe up and down one could locate the level of liquid CO2. Everyone else on board was terrified of it in case they became sterilized or developed radiation sickness!
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