Offshore supply vessel dedicated to ferrying personnel, deck cargo, and bulk products (mud, brine, water, fuel) between shore base and offshore installation.
Regulatory detail & full definition
Typically 60-90 m LOA, 4,000-5,000 DWT. DP-2 standard for working alongside platforms. Tank arrangement separates mud, brine, drill water, potable water, fuel, methanol. No anchor-handling gear (distinguishes from AHTS). Common operators: Tidewater, Bourbon, DOF, Solstad.
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