American Club: Transport Guidance for Steel Cargoes
93
APPENDIX 1
: LIST OF DEFINITIONS
•
Dew point: The temperature at which air becomes saturated and cannot hold all of the moisture in it and
condensation begins to form.
•
Dry-bulb thermometer: A thermometer used to measure the ambient temperature. The dry-bulb thermometer is
exposed to the air but shield from radiation and moisture. The dry-bulb thermometer is one of the two thermometers
that make up a psychrometer.
•
Dunnage: Loose materials used to support and protect cargo in a vessel’s hold. Examples of such materials include
plywood, plastic/polythene sheets, cardboard, Styrofoam,
air bags, rubber padding, kraft paper, bamboo, bamboo
mats, timber, etc.
•
Mate’s Receipt: A receipt document signed by the vessel’s Master or chief officer, acknowledging
the condition and
receipt of cargo by the vessel. The individual in possession of the Mate’s Receipt is entitled to the bill of lading,
which in due course is issued in exchange for that receipt.
•
Steel: A generally hard, strong, durable, malleable alloy of iron and carbon, usually containing between 0.2 and 1.5
percent carbon, often with other constituents such as manganese, chromium, nickel, molybdenum, copper, tungsten,
cobalt,
or silicon, depending on the desired alloy properties, and widely used as a structural material. Examples of
the types of steel that are commonly transported by sea can be found in Section 3.
•
Sweat: The formation of condensation within a vessel’s hold. Sweat can be categorized into two types: ship sweat
and cargo sweat.
•
Ship sweat. Condensation that accumulates on a vessel’s steel structure in the cargo hold’s side or deckhead when
a vessel sails from a warmer to cooler place and warm air in the cargo holds come into
contact with the cooler
vessel’s structure.
•
Cargo sweat. Condensation that accumulates on the surface of a cargo when its temperature is below the dew point
of the air adjacent to it.
•
“3º Celsius Rule”: Rule of thumb for ventilating. If the temperature of the outside air is at least 3º Celsius cooler
than the air in the hold, then the cargo should be ventilated.
•
Wet-bulb thermometer: A thermometer with a bulb that is covered with moist muslin and is used in a psychrometer
to measure humidity.
•
Whirling psychrometer: A psychrometer with a handle, which allows rapid rotation of mounted wet- and dry-bulb
thermometers to ensure air flow around the bulbs.
American Club: Transport Guidance for Steel Cargoes
94
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