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RightShip Guide

THE DEEPDRAFT · RIGHTSHIP PREPARATION

Ro-Ro drainage and blockage protection

RISQ 8C.25Section 8C · Cargo Operation: General CargoSource marking: V

Applicability: Section 8C is for general cargo ships, Ro-Ro ships, timber carriers and non-cellular ships fitted for containers. It must not be used for cellular container ships. Ro-Ro cargo ships; detailed drainage provisions depend on space, system and construction applicability.

What is being checked

Drainage remains effective when firefighting water is discharged.

Ready on board

0 / 5 checked

Check the vessel’s actual procedures, equipment and records against these points from RISQ 3.2.

Keep drainage serviceable and retain regular test/examination records.For the applicable protected spaces, verify removable drain protection with open area at least six times the drainpipe area, raised/angled against obstruction and individual openings no more than 25 mm.Check the source’s exceptions for fixed mechanical unblocking or non-gravity systems with their own filter.Provide clear drain-obstruction warnings at least 1,500 mm above openings with letters at least 50 mm high where specified.Inspect periodically for blockage/damage and flush with hoses if obstructions are found to confirm function.

Practice questions

Preparation prompts derived from this entry, not an official inspector interview script.

1Is a grating always required regardless of the drainage system?

No. The guidance identifies specific alternative arrangements.

Where a finding may arise

Missing evidence, unsafe arrangements or gaps in familiarity against these checks may prevent a satisfactory answer. These are derived preparation concerns, not additional explicit finding criteria or reported past observations.

Past observations for practice

Anonymised reports, manually reviewed before publication. These are reported experiences, not additional inspection requirements.

No reviewed observations have been added for this entry.

Share an observation for private review

Remove vessel, company and inspector names, report numbers, exact dates and confidential information. Do not paste a complete inspection report.

Source clarification

The source links the drainage provisions to fixed water-spraying systems in relevant vehicle/Ro-Ro/special-category spaces and states a 1 January 2010 construction condition. Do not apply the dimensions to unrelated drains.

References and source status

RightShip Inspection Ship Questionnaire, November 2025, version 3.2. Section 8C, page 143, reference 8.25.

The explanation, checklist and practice answer derive from the supplied questionnaire. Reported observations are separately contributed and manually reviewed; they are not official RISQ guidance.

Independent DeepDraft preparation guide, based on the supplied RISQ 3.2 questionnaire. Not an official RightShip product or inspection report.