Ships and cruise vessels are closed systems. Hydrogen sulphide (H₂S) from the drains can be deadly in the cabin or engine room. P-traps dry out due to tilt, vibration, and forgotten cabins. Green Drain™ is a mechanical one-way barrier that backpressure from the sewer does not open.
The vessel pitches, rolls, and vibrates. The P-trap isn't static. A P-trap in the cabin can empty due to water movement. Plus the enclosed space — H₂S that on land would escape through a window here accumulates in the cabins.
Irish ports (Dublin, Cork, Rosslare, Shannon Foynes), marina networks operated by the Irish Marine Federation, Marine Institute-certified vessels, cruise calls to Dublin, Cork and Belfast, plus the Irish Naval Service fleet — all share the same constraint: closed sanitary systems where one dry P-trap can release H₂S into accommodation spaces. MARPOL Annex IV governs blackwater, which is directly linked to onboard drainage.
Statistical data taken from official Irish and EU sources: Central Statistics Office Ireland (cso.ie), Health Service Executive (hse.ie), Fáilte Ireland (failteireland.ie), Bord Bia (bordbia.ie), IDA Ireland (idaireland.com), Health Products Regulatory Authority (hpra.ie). Regulatory framework: EUR-Lex for EU directives — EU 2017/745 (MDR), EU 178/2002 (food safety), EU 1935/2004 and EU 10/2011 (food contact materials), EU 528/2012 (BPR), EU 2014/34 (ATEX). Standards: EN 1253-1 (floor P-traps, water seal ≥50 mm), EN 1253 Parts 6/7/8 (gullies with a water seal below 50 mm, with mechanical closure, and combined types; 2023 editions), HACCP International RG-04, ASSE 1072-2020, NSF/ANSI 2, HSE SARI guidelines. Revision date: May 2026.
The ideal time is during a regular ship dry dock. Cabins, washrooms and engine rooms are all fitted during the planned dry dock.
Review of vessel documentation and drainage systems — compliance with the classification society.
10 cabins and one engine room — pilot during the voyage.
The entire vessel is undergoing a planned overhaul.
The classification society records it in the ship's documents.
The Irish maritime sector includes Dublin Port and the Port of Cork (regular international cruise calls), Irish Ferries and Stena Line (RoRo to UK and France), the Irish Sailing & Marine Federation marina network, plus the Irish Naval Service fleet. Cabin drains are typically DN50; crew sanitary and engine-room sumps are larger. Specific challenges: vibrations, saline atmosphere, MARPOL Annex IV.
Technical documentation and compliance with EN 1253 and NSF/ANSI 2 are submitted to the classification society during the audit. The specification is in line with the general approach for sanitary systems.
The seal operates mechanically — it's not like a P-trap that relies on water. Vibrations don't affect it. Tested in industrial environments with constant vibrations.
The silicone material is resistant to a saline atmosphere and UV. The external plastic frame is as well. Expected service life: about five years in marine conditions.
Green Drain™ doesn't work alone — for maximum drain control it's combined with GD Uri-Tabs™ (urinals) and GreenSwirl™ (drain unblocking).
Patented silicone seal for deck drains on ships, in marinas, and at ports. H₂S and odours for confined spaces, MARPOL Annex IV compliant.
Bio-enzymatic urinal tablets for shipboard washrooms and marinas. Without harsh chemicals that would contaminate the sea after discharge.
Bio-cleaning of drains in confined spaces. Disruption of biofilm without substances classified as MARPOL pollutants.
We come to the site, map the drains, and provide a written recommendation — no cost, no obligation.