5 Protection of Drain Openings
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1320 – Guidelines for the Drainage of Fire-Fighting Water From Closed Vehicle and Ro-Ro Spaces and Special Category Spaces of Passenger and Cargo Ships – (11 June 2009) - Annex – Guidelines for the Drainage of Fire-Fighting Water From Closed Vehicle and Ro-Ro Spaces and Special Category Spaces of Passenger and Cargo Ships - 5 Protection of Drain Openings

5 Protection of Drain Openings

  5.1 An easily removable grating, screen or other means should be installed over each drain opening in the protected spaces to prevent debris from blocking the drain. The total open area ratio of the grating to the attached drain pipe should be at least 6 to 1. The grating should be raised above the deck or installed at an angle to prevent large objects from blocking the drain. No dimension of the individual openings in the grating should be more than 25 mm.

  5.2 No grating or screen is required when a fixed mechanical system is provided to unblock the drainage system, or when other than a gravity drain system is provided with its own filter.

  5.3 A clearly visible sign or marking should be provided not less than 1,500 mm above each drain opening stating, “Drain opening – do not cover or obstruct”. The marking should be in letters at least 50 mm in height.

Parent topic: Annex – Guidelines for the Drainage of Fire-Fighting Water From Closed Vehicle and Ro-Ro Spaces and Special Category Spaces of Passenger and Cargo Ships
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