ISO 5620-2:1992

Overview

ISO 5620-2:1992 is an international standard developed by the International Organization for Standardization (ISO) focusing on shipbuilding and marine structures. This standard defines the technical specifications for the components of filling connections used on ships' drinking water tanks. These connections are essential for attaching piping either from another ship or from a land-based water distribution system, ensuring the safe and secure supply of potable water on board. The standard details main components such as flanges, securing bolts, and gaskets, and it provides requirements for materials, dimensions, and designations.

Key Topics

• Filling Connection Components
  ISO 5620-2 specifies the main elements for drinking water tank filling systems:

  • Supply watering flange
  • Ship watering flange
  • Ship watering blind flange
  • Securing bolts or stud-bolts
  • Gaskets
  • Nuts, padlocks, and securing chains

• Material Specifications
  The standard references quality requirements for steels and elastomer materials:

  • Minimum steel quality in line with ISO 630 for flanges
  • Non-corrodible steel for bolts, nuts, and chains as per ISO 683-1
  • Seawater-resistant elastomer for gaskets, suitable for potable water applications

• Dimensional and Surface Requirements

  • All key components must conform to designated dimensions for compatibility and safety
  • Surface textures as indicated by ISO 1302
  • Positioning of holes and fittings in accordance with parts of ISO 5620 series

• Component Designation
  Each component that meets the requirements is given a unique designation (e.g., Flange ISO 5620-2 - A).

Applications

• Shipbuilding
  ISO 5620-2 is critical in the construction and retrofitting of ships, ensuring consistent, safe, and sanitary water supply systems. It supports:

  • Standardization in procurement and manufacturing of filling connection parts
  • Simplified maintenance and replacement due to unified dimensions and materials
  • Enhanced safety and reliability of maritime potable water supply lines

• Marine Structures
  The standard's guidelines are also applicable to fixed marine structures with potable water tanks, improving operational efficiency by defining clear specifications for supply connections.

• International Compliance
  Compliance with ISO 5620-2 supports shipyards, manufacturers, and fleet operators in meeting international requirements for potable water system connections, facilitating global operations and port calls.

Related Standards

• ISO 5620-1 - Shipbuilding and marine structures - Filling connection for drinking water tanks - Part 1: General requirements
• ISO 630 - Structural steels (for minimum steel quality requirements)
• ISO 683-1 - Heat-treatable steels, alloy steels, and free-cutting steels (for non-corrodible steel requirements)
• ISO 1302 - Technical drawings: Method of indicating surface texture
• ISO 2341 - Clevis pins with head (for securing bolt alternatives)
• ISO 4016 - Hexagon head bolts (for bolt standards)
• ISO 4026 - Hexagon socket set screws with flat point (bolt alternatives)
• ISO 56204 - Shipbuilding and marine structures - Filling connection for drinking water tanks - General requirements (for complementary requirements)

Summary

ISO 5620-2:1992 provides essential, standardized guidance for the components of drinking water filling connections on ships and marine structures. By clearly detailing the materials, dimensions, and designation of primary parts, it improves safety, quality, and compatibility in marine potable water supply systems. Adoption of this standard helps ensure international interoperability and reliable water supply operations at sea.