Overview
EN ISO 5620-1:1996 (ISO 5620-1:1992) - "Shipbuilding and marine structures - Filling connection for drinking water tanks - Part 1: General requirements" specifies the general requirements, composition and designation of a complete filling connection for drinking water tanks aboard ships. The standard defines the connection used for attachment of piping or hoses from another ship or a land distribution system, and gives recommendations for shipboard installation to safeguard drinking water from contamination.
Key topics and technical requirements
- Connection principle: Uses special ship watering flanges with a five-point connection for mating.
- Nominal sizes/ratings: Flange and piping nominal diameter DN 65 and nominal pressure PN 16 are specified.
- Materials and strength: Flange connections must be made of weldable steel with minimum tensile strength of 360 MPa.
- Corrosion protection: Requires hot-dip galvanizing in accordance with ISO 1461 or alternative coatings that do not constitute a health hazard.
- Sealing: A gasket of material suitable for drinking water systems must be fitted to the ship watering flange.
- Security: The blind flange on the ship’s side is to be secured with a corrosion‑resistant padlock fitted to a securing bolt; components such as securing chain and stud-bolts are detailed.
- Composition and designation: The complete connection is designated by elements including the part number (ISO 5620-1) and a code letter for composition (example: Code Z). Detailed component specifications are in ISO 5620-2.
- Installation recommendation: The flange connection should be installed in a suspended position, with a bent pipe recommended to facilitate safe filling and drainage.
Applications and practical value
- Standardizes the interface for shipboard drinking water filling, enabling safe and interchangeable connections between ships and shore supply systems.
- Prevents cross‑contamination of drinking water tanks and supply piping by ensuring secure blind flanges, proper gasket materials and corrosion‑resistant finishes.
- Useful for design, procurement and inspection of ship piping systems, shipyards, ship operators, marine engineers, and component manufacturers supplying watering flanges, gaskets, padlocks and related fittings.
Who would use this standard
- Shipbuilders and naval architects specifying potable water systems.
- Marine engineers and ship operators implementing safe filling points.
- Manufacturers and suppliers of maritime piping components and flanges.
- Port and regulatory authorities assessing compliance for shipboard water connections.
Related standards
- ISO 5620-2 (Components) - details individual parts referenced by Part 1.
- ISO 1461 - hot-dip galvanized coatings.
- ISO 2553 - symbolic representation of welded joints (referenced for weld depiction).
Keywords: EN ISO 5620-1:1996, filling connection, drinking water tanks, shipbuilding, marine structures, watering flange, DN 65, PN 16, hot-dip galvanizing, ISO 5620-2.
