Graphic Version

Assumptions and rules of thumb

• Maximum annual TEU slot turnover = 70 turns (5 day dwell, 350 days/yr)
• Crane available 16 hours/day (two shifts), 250 days/yr
• Modern crane maximum = 35 moves/hr
• Vessel spacing at berth = vessel beam
• Maximum of 260 annual calls per berth (5 per week)
• Working draft = channel/berth draft – 3 feet
• Maximum vessel sailing draft = 92% of design draft
• Sustainable capacity = 80% of maximum capacity

Example: Terminal with 7 Cranes

• 7 cranes @ max of 4,000 hrs/yr = 28,000 crane hours
• 80% = 22,400 sustainable crane hours
• Maximum crane productivity of 35 containers per hour
• 80% = 28 cont./hr x 1.54 TEU/container = 54 TEU/hr
• Sustainable crane capacity = 54x22,400 = 1,209,600 TEU/yr