Kristian Gerhard Jebsen Skibsrederi use GrafoTherm in their Gear Bulk ships for transportation of paper and
first series of three bulk ships were built in 1990/91. When in 2000 a new series of similar ships were to be built GrafoTherm
was specified as condensation protection, due to the good experience of the product.
Paper pulp release large quantities
of water during the transport. This water condenses in the roof of the garage and drips down on the cargo. To avoid damage
the Gear Bulk ships are supplied with high capacity dehumidifiers, to keep the indoor air below dew point.
At loading and unloading
the doors must be opened and then the dehumidifiers do not work any more. Especially wintertime, during cold weather, the
humidity released by the paper pulp forms large quantities of condensation in the roof. Not until the doors are closed the
dehumidifiers can start working again and even then it takes time before the indoor air is below dew point and during that
period dripping continues.
Jaeger Arrow has got a special problem. The ship loads paper pulp
in north Canada and in wintertime is on the Atlantic Ocean and enters the warm and humid Gulf Stream the inside of the garage
is exposed to a condensation chock. The steel walls of the hull are still very cold and condensation water literarily pours
down the hull sides.
A 2 mm thick GrafoTherm Standard Marine coat was sprayed in 4 coats in the roof and 6
metres down the hull sides. The corrosion protection was a dull zinc rich epoxy that gave a good adhesion to the GrafoTherm
coat. The application took place in January and to create the necessary conditions for the drying and film forming process,
the deck was covered with tarpaulins, under which hot air was blown. Also the inside of the garage was heated.
During loading and
unloading GrafoTherm acts as a buffer, which absorbs and stores the condensation water, thus preventing it from dripping and
running. When the ship is loaded and the doors are closed, the dehumidifiers can start working. GrafoTherm releases the accumulated
water in the form of vapour to the air.
The condensation water may freeze to ice during the loading, but that constitutes no problem.
GrafoTherm will hold for that stress. Due to the micro porous structure of GrafoTherm the evaporation of water is almost three
times as fast as from a metal or painted surface.
Also the condensation problems at the entrance of the Gulf Stream are taken
care of by the GrafoTherm treatment.