The Reliance / 550 Class ATB Fleet (155,000 bbls) - Design Highlights and Specifications

(click photo to enlarge)

The Reliance / 550 Class ATBs were developed and designed specifically for the West Coast trade and weather conditions with advanced safety features such as double hull, IGS, segregated ballast and radar gauging system. They offer proven reliability and performance, with the best achievable technology available today. Crowley is currently operating 4 units in this class on the West Coast. Together they have safely transported over 38 million barrels of products since delivery in 2002 with no spills.

Delivery of this class of ATB to a customer is projected to be 20 to 22 months after contract signing.

Design Highlights

• Twin screw 9,280 hp tug with Intercon notch connection
• Proven design for West Coast bar crossings
• Barge meets ABS SafeHull criteria
• ATB unit meets criteria for USCG dual mode ITB designation (NVIC 2-81)
• Double hull configuration for barge
• 4 cargo pumps with a 5,000 bbl/hour discharge capacity
• Sumped cargo tanks allowing for minimal cargo ROB
• Natural double block segregations can vary due to the unique "ring main" pumping system
• -A: 25,000/ B:25,000/ C:75,000/ D:25,000
• -B:37,500/ B:37,500/ C:37,500/ D:37,500
• -C:25,000/ B:37,500/ C:50,000/ D:37,500
• -D:62,500/ B:12,500/ C:12,500/ D:62,500
• Remote readout gauging system and real-time Cargo-Max stress monitoring
• 2 ballast pumps each rated at 5,000 bph
• Dual Main Vapor recovery system & IGS system
• 2 Cargo booms with 10 ton lift capacity
• Mooring system with 9 ea. 1,000 foot spectra type (plasma) lines on split drums capable or recovery at 100ft/min and 10 ea capstans for additional lines if required
• One anchor windlass with 10 shots of chain and 9520# Danforth anchor stowed in recessed pocket
• Barge equipped with 4 Yokohama docking fenders for ship lightering operations.
• Barge meets OCIMF and ISCOTT requirements