Draw & describe CO2 flooding system for cargo hold.

Description: Pipe of 20 mm diameter are led from various cargo hold to bridge cabinet for sampling purpose. Air is drawn from these pipes by cabinet suction fan which deliver air to wheel house or out side through diverting valve. When fire breakout in a compartment smoke issues from diverting valve into wheel house. 

Simultaneously an electronic smoke detector in the cabinet set off audible alarms. Smoke can be easily detected on the cabinet pipes due to light illumination. Operation of the fan is confirmed by movement of nylon propeller. Change over valves are situated inside the lower portion of the cabinet. To flood an affected compartment with CO₂ gas the operator would first operate the appropriate change over valve and secondly release the requisite number of cylinders for the compartment. CO₂ gas then would pass through the sampling pipe to the space in which fire exists.