Vapour transfer assembly and method for use thereof

A vapour transfer assembly for a plurality of oil tanks connected to a common ventilation pipe, comprising:

• at least some of the plurality of oil tanks being grouped into a cluster of tanks that comprises at least two tanks;
• a vapour transfer conduit from at least a first tank of said cluster of tanks to a second tank of the said cluster being configured for causing an atmosphere displaced from the first tank of the cluster of tanks to move through at least the second tank of said cluster of tanks prior to entering the common ventilation pipe, thereby slowing a build-up of concentration of volatile organic compounds (VOC) in the atmosphere entering the common ventilation pipe,
• wherein the vapour transfer conduit includes one of:
• a throttle valve configured to allow a predetermined pressure build-up in the first tank, whereby a vaporization of oil is counteracted;
• or
• a diffusor element at an outlet end configured to spread a flow of vapour into a substantially horizontal fan-shaped flow.

A method for filing a plurality of oil tanks connected to a common ventilation pipe and allow atmosphere to be displaced from the plurality of the oil tanks and avoid excessive pressure build-up, comprising:

• grouping at least some the oil tanks into a cluster of tanks having at least two tanks;
• and
• connecting a vapour transfer conduit from a first tank of the cluster to a second tank of the cluster, said vapour transfer conduit allowing the atmosphere displaced from the first tank to move through at least the second tank prior to entering the common ventilation pipe and slowing a build-up of concentration volatile organic compounds (VOC) in the atmosphere entering the common ventilation pipe,
• wherein the vapour transfer conduit enters the second tank at a height that is within a range of 20-50% of a height of the second tank.