USCG Barge Supervisor case studies
USCG Barge Supervisor · Put your knowledge to work in context.
The USCG Barge Supervisor endorsement is a merchant mariner credential administered by the United States Coast Guard's National Maritime Center. It is aimed at mariners who supervise cargo and deck operations aboard tank and freight barges - the person responsible for loading and discharging cargo, monitoring transfer lineups, maintaining barge stability and trim, keeping required records, and directing the crew on watch. The USCG Barge Supervisor case studies are 5 cases and about 3,226 words.
1Tanker Discharge Rate vs. Vapor Recovery Capacity
You are the barge supervisor on a 10,000-barrel inland tank barge discharging gasoline at a shoreside terminal. Shore vapor recovery is connected and the terminal reports the VRU is operating at its design capacity of 400 scfm.
677 words, about 3 min2Segregated Ballast and a Questionable Cargo Compatibility
A 15,000-barrel barge is nominated to load two grades in adjacent tanks: Tank 3 is to receive a light naphtha (flash point well below 60°F), and Tank 4 is to receive a heavier distillate. The previous cargo in Tank 4 was a leaded gasoline component; the tank was stripped and ventilated but not water-washed, and the gas-free certificate lists the tank as 'suitable for petroleum service' without specifying the previous product.
678 words, about 3 min3Free Surface and a Partially Loaded Barge in a Beam Sea
A 12,000-barrel barge is loaded to about 60% in three center tanks, each roughly 30 feet wide and 60 feet long, with the remainder of the cargo in wing tanks. The barge is in a wide river with a beam sea and a 20-knot wind on the beam.
679 words, about 3 min4Sheen at the Manifold During a Night Transfer
At 0200, during a night transfer of diesel from a barge to a shore tank, a deckhand reports a light sheen on the water at the barge's manifold. The transfer is running at about 800 gpm.
586 words, about 3 min5Fire in the Pump Room During Cargo Transfer
During a transfer of a flammable product, a fire is reported in the barge's pump room. The pump room is below deck, accessed by a single ladder, and contains the cargo pump and associated piping.
606 words, about 3 min