The gas stream compressed by BOG compressor is sent to the recondensing column to be absorbed by the liquid LNG stream coming from LP Pumps installed inside the storage tanks: such operation is possible due to the subcooling induced in the LNG stream by pumping action. ​

Part of the incoming liquid stream is diverted to the column top where an internal distributor supplies the required flowrate for condensation directly on top of a random packed section, which provides the surface required for heat exchange and mass transfer between the two phases. Liquid flow rate to the packed section is controlled by a pressure controller on the recondenser. ​

The BOG stream is instead introduced into the column under the packed section, to be condensed by the LNG stream described above: rising through the packing in counter-current to the descending liquid maximizes the temperature difference. The LNG Booster Pumps sumps vent line is routed back to the column to be recondensed too. ​

The remaining part of incoming LNG stream is diverted to the hold-up section of the column, under level control: this section ensures the required residence time and enough NPSHa for LNG Booster Pumps, also receiving the minimum flow recirculation line of these pumps. ​

The recondenser is provided with a padding gas entry. If the padding gas is taken downstream, the vaporizers send out line upstream of the metering station: this connection allows for maintaining the recondenser pressure at a minimum value in case the BOG compressors flow is reduced. ​

The recondenser is provided also with a direct controlled venting connection back to the tank vapor header: this prevents eventually excessive pressurization of the recondenser releasing gas back to the vapor header. ​

In case of temporary unavailability of the recondenser due to maintenance, the unit can be completely bypassed allowing to maintain the full send-out flowrate. ​