UWILD vs Dry Docking: Cost Comparison for Vessels in African Ports

Understanding UWILD and Dry Docking Options

All classed vessels require periodic underwater inspections to maintain their classification society certification. Traditionally, this meant dry-docking every 2.5 to 5 years, depending on the vessel type, age, and flag state requirements. However, most major classification societies now offer UWILD (In-Water Survey in Lieu of Dry-Docking) as an alternative that allows the underwater examination to be conducted while the vessel remains afloat and operational.

The Cost Breakdown

The total cost of a dry-docking event extends far beyond the docking fee itself. When all factors are considered, UWILD surveys represent a fraction of the cost. Below is a representative comparison for a typical 50,000 DWT bulk carrier.

Dry Docking Costs

• •Dry-dock rental: $50,000 — $120,000 per day (typically 5-14 days)
• •Lost revenue from off-hire: $10,000 — $50,000 per day
• •Towage and pilotage to/from dry-dock facility: $10,000 — $30,000
• •Accommodation and logistics for crew during docking: $5,000 — $20,000
• •Opportunity cost of delayed schedule: Variable but significant

UWILD Survey Costs

• •Diving team mobilization: $3,000 — $8,000 (depending on port)
• •Survey execution (CCTV, photos, thickness measurement): $4,000 — $12,000
• •Total UWILD cost: Typically $7,000 — $20,000
• •Vessel remains operational — no off-hire
• •No towage or logistics costs

The cost savings are dramatic: a UWILD survey typically costs 2-5% of a full dry-docking event. For a vessel that would otherwise dry-dock for 7 days, the savings easily exceed $200,000 — not including the operational disruption avoided.

When UWILD Makes Sense

UWILD surveys are ideal for vessels in good condition with no known structural issues, operating on tight schedules where off-hire time is especially costly. They are also well-suited for vessels trading exclusively in regions with limited dry-docking facilities, such as many African ports where the nearest dry-dock may be hundreds of miles away.

When Dry Docking Is Required

Dry-docking remains necessary for major repairs, scheduled coating renewal, propeller shaft inspections, tail shaft removal, and certain regulatory requirements. UWILD is not a replacement for every dry-docking but can safely extend the interval between them, allowing operators to defer the full expense and schedule the dry-docking at a more convenient time and location.