ISO 14409:2011

Overview

ISO 14409:2011 - Ships and marine technology - Ship launching air bags - establishes requirements for the design, manufacture, testing and acceptance of ship launching air bags constructed with synthetic‑tyre‑cord reinforcement layers. The standard defines terms and classification, materials and dimensional tolerances, detailed test methods (gastightness, compression, bearing capacity, bursting, compression–recovery), and rules for marking, documentation, packaging, transport and storage. It is the international reference for specifying reliable, safe air bags used in vessel launching operations.

Key topics and technical requirements

• Scope and definitions: Clear terms for body, head, mouth, rated working pressure, bearing capacity, burst pressure and percentage deformation.
• Classification: Two main types by bearing capacity per metre - QP (ordinary) and QG (high‑bearing capacity) - with models QP3, QP4, QP5 and QG6 (layer counts).
• Geometry and tolerances: Typical diameters (0.8, 1.0, 1.2, 1.5, 1.8 m); length specified by user; dimensional tolerance ±3% at rated working pressure.
• Materials: Construction with outer and inner rubber layers plus one or more synthetic‑tyre‑cord fabric reinforcement layers; materials must be vulcanized firmly.
• Rubber performance (per referenced test methods): tensile strength ≥ 18 MPa, elongation at break ≥ 400%, Shore A hardness 60 ± 10, tear strength ≥ 400 N/cm, compression set and ageing resistance limits, and ozone resistance requirements.
• Reinforcement fabric: Warp density ~ (90 ± 5) cords/100 mm; cord breaking strength > 205 N/cord.
• Testing protocols: Specified ambient conditions (10–35 °C), media (clean compressed air; fresh water for burst test), calibrated instruments. Key tests include:
  • Gastightness: pressure loss < 5% after 1 hour.
  • Compression and compression–recovery: compression to 70% deformation with recorded force/pressure curves.
  • Bearing capacity: load per metre calculated from contact width × internal pressure; acceptance values listed in the standard’s performance table.
  • Bursting and type/acceptance test procedures.
• Marking & documentation: Requirements for traceability, user documentation, packaging, transport and storage guidance.

Applications and users

ISO 14409:2011 is used to specify and verify ship launching airbags for safe vessel launch operations. Primary users include:

• Shipyards and shipbuilders procuring launching air bags
• Air bag manufacturers and quality assurance teams
• Marine equipment test laboratories and inspection bodies
• Classification societies and procurement engineers responsible for launching operations

Related standards

Normative references used for material and test methods include:

• ISO 34‑1, ISO 37, ISO 188, ISO 815‑1, ISO 1431‑1, ISO 7619‑1

Keywords: ISO 14409:2011, ship launching air bags, ship launching airbags, marine technology, bearing capacity, compression test, bursting test, synthetic‑tyre‑cord reinforcement, rubber material requirements.