Inert Gas Cooling/Scrubber Pumps
Inert gas is used onboard tankers with flamable cargo. It is pumped into the tank to replace the atmospheric air as this contains oxygen which can make the cargo ignite.
Inert gas can be nitrogen from a nitrogen generator or exhaust gas from a inert gas generator where fuel has been burned using the oxygen. However, after the burning the inert gas needs to be cooled.