ATB : Authority To Board. Used for oil shipments – issued by the seller, it provides the authority to enable the buyer to board the vessel to confirm cargo availability, quantity and quality.
ATL : Authority To Load: Authority to load buyer’s vessel
ATPCC : Allocation Transaction Passport – Code Certificate
ATSC : Sellers Authorization to Sell & Collect
ATV : Authority to verify
BG : Bank Guarantee
Conversion (For Oils):
1 Barrel = 42 gallons or 0.138 Metric Ton
1 Gallons = 0.0238 Barrels or 0.00325 Metric Ton
1 Metric Ton = 7.25 Barrels or 304.5 Gallons
For more references please check the link : Conversion
Calculator