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CHT SYSTEM - Coggle Diagram
CHT SYSTEM
H2S
H2S gas is given off by the biological system, and must be provided before entering sewage compartments
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Other hazards include Calcium Hypochlorite, Methane and Chlorine
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150-400 ppm is injurious, loss of smell, dizziness, may need to flush air
400 - 700 ppm is dangerous, may produce severe injury or death, coughing collapse and breathing stops / death if artificial respiration not provided
700 - 1000 ppm is an immediate threat to life, rapidly produces unconsciousness and permanent brain damage possible
1000ppm causes immediate unconsciousness, death in seconds
Step By Step
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From there level switches active a discharge / transfer pump that move waste to larger holding tanks
It is then held there until discharged shoreside or out of the 12 NM shoreline radius, via the low & high dish valves
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How Does It Work
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The Collection Tank holds a 1 day output, whereas the holding tanks have a total capacity of 12 days
VPS
Made up of hoses, manifolds and diesel / electric pumps, it transfers grey / black water to shoreside facilities as some countries forbid sewage and greywater to be discharged within harbour
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It's use is determined by ship size and length of stay, under 72 hours local contractors must be used, over 72 hours a team of 20 ME's must deploy the VPS, a task which takes approx 3 hours and is overseen by the Hull Sr