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Subject: Re: Onboard cover of steel coils Author: Janet M Peck, MIIMS, Rem, AMS® [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 10:38:06 12/28/02 Sat In reply to: Erik Hammarstrom 's message, "Onboard cover of steel coils" on 06:34:22 02/15/02 Fri >Understand that receivers of cold rolled steel coils >insist on having coils covered - or rather sealed in - >as stowed >by arranging sort of plastic tent on top. This would >stop condensation damage since low temperatures will >remain under the plastic cover and thus act as a >"fridge" when sailing from cold climat to warm climat, >say from -20degC to +20degC. >Would appreciate comments on above and if any >experience on arrival condition of cargo covered as >descibed. > >Bets regards. E.H Actually it will only address one form of condensation that which forms on the overheads and drips down on the product. It will not form a barrier against that which forms on the product itself! If the product is cold to begin with and the hold is opened or vented then warm moisture laden air will enter. As we all know cold air is less capable of holding moisture thus the product will become the condensing surface and form moisture droplets on it. It is dew point that controls condensation When the dew point of the cargo surface is below the ambient air within which the cargo is stored, moisture vapor will deposit on the cooler surface in the form of droplets. Our air contains moisture in the form of water vapor. When warmed, the air is capable of containing more moisture vapor then when cooled. The amount of moisture vapor is normally expressed as relative humidity, and shown as a percent (%), this gives us the amount of water vapor actually in the air as compared to the total amount of water vapor that the air can hold. Proper ventilation techniques and control of the cargo temperature (hold selection) will help. Janet M Peck, MIIMS, Rem, AMS® [ Next Thread | Previous Thread | Next Message | Previous Message ]