The emergency chlorine vapour scrubbing system is a three-stage chemical absorption system consisting of a horizontal cross flow spray system followed by two horizontal cross flow packed bed sections.An induced draft fan pulls vapours through the scrubber, where intimate contact with a recirculating caustic solution results in the complete absorption and removal of chlorine or sulfur dioxide vapours.A high efficiency mist eliminator is located in the gas stream, prior to exhaust, to remove any residual caustic solution. A chlorine detector or manual remote start switch activates the system in two steps.The caustic pump is activated first to permit proper wetting of packing in the scrubber stages before starting the exhaust fan, with a 0 to 5 second adjustable time delay. The time delay is typically set for 3 to 5 seconds. This feature allows the scrubber to be ready prior to passing any chlorine laden gases through it.