Purging is carried out to remove hydrocarbon vapors present in the tank for eliminating any risk of fire. It is also used to remove flammable mixture formed inside the tanks whenever oxygen is introduced into the tanks. This is usually done after tank cleaning operations.
119. l Marine Insight The cargo tanks maybe purged with inert gas to reduce the concentration of the hydrocarbon gas inside the tank atmosphere. Purge pipes, with proper flame screens, shall befitted, where provided. Procedure
for purging is as follows • Follow the procedures as laid out in the operation and equipment manual
• Ensure that all the cargo tank openings on deck are closed and secured
• Open the gas freeing ports on the first set of tanks to be purged. For e.g. 1 Port and 1 Starboard
• Open the inert gas inlet
valve only for the same set, and the inlets to rest all tanks should be closed
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