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VOC from Crude Tanker Loading

Volatile-organic-compound losses during cargo loading on crude tankers. MARPOL Annex VI Reg 15 requires VOC Management Plans on crude tankers ≥ 500 DWT.

PollutantsMARPOL VI Reg 15

Crude cargo loadedtVOC factorkg/tDefault 0.55 kg VOC per tonne of crude loaded for typical closed-loop inert-gas systems. Can be as high as 1.5 kg/t for older open-loop arrangements.

Annual VOC loss

550.0t

Sources & controls

Crude oil carries dissolved volatile hydrocarbons (C3–C7 predominately) that flash off as tanker cargo tanks fill. A Vapour Emission Control System (VECS) captures and either re-liquifies, flares, or returns these to shore, reducing VOC losses by 90 %+.

MARPOL Annex VI Reg 15 requires a ship-specific VOC Management Plan (VOCMP) for crude tankers ≥ 500 DWT, describing arrangements for VECS operation and loading-rate control.

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