ISO 9519:2023

Overview

ISO 9519:2023 - Ships and marine technology: Single rungs and rungs for dog-step ladders - specifies the types, structure, dimensions, technical requirements, inspection and designation of single rungs and dog-step ladder rungs fitted to vertical panels or masts on ships and other marine structures. This second edition updates material grades, surface-treatment and inspection requirements and extends the scope and dimensional options for marine ladder rungs.

Key topics and technical requirements

• Classification and types: Defines Type A/B (for panels or masts > 300 mm diameter) and Type C (for masts ≤ 300 mm).
• Structure & dimensions: Presents standard geometries (width, depth, height, bar section length) and theoretical weights (based on ISO 1035-2). Exact dimension tables are provided in the standard.
• Material: Rungs shall be steel meeting ISO 630-2, with minimum grade S235.
• Surface treatment:
  • Protective coatings compatible with location.
  • Rungs fitted in ballast tanks must meet PSPC performance coating requirements.
  • Free edges rounded to R2 mm.
  • Hot-dip galvanizing recommended after de‑rusting; coating thickness per ISO 1461.
• Appearance & finish: Rungs must be smooth, free of burrs, dents and cracks; arc and sharp corners must be well formed.
• Tolerances: Width tolerance ±2 mm (referencing ISO 2768-1); weight tolerance not to exceed ±4% of theoretical weight.
• Inspection: Visual checks for surface treatment and appearance; measurement of coating thickness, dimensions and weight to verify tolerances.
• Designation: Standardised delivery-note format (e.g., Rung ISO 9519 - A300–20–280).

Applications and users

ISO 9519:2023 is intended for practical use where safe, durable ladder rungs are required in marine environments:

• Shipbuilders and shipyards specifying and installing fixed ladders and dog-step ladders
• Marine architects and structural designers detailing masts and vertical panels
• Classification societies and flag administrations assessing ladder compliance
• Procurement and asset managers buying replacement rungs or ladder components
• Maintenance and safety teams performing inspections, repairs and repainting

This standard supports safety, corrosion resistance and interchangeability of marine ladder rungs, helping ensure compliance with shipbuilding and onboard safety practices.

Related standards

• ISO 630-2 (structural steel delivery conditions)
• ISO 1461 (hot-dip galvanizing - coating specifications)
• ISO 1035-2 (dimensions of square bars)
• ISO 2768-1 (general tolerances)
• PSPC (Performance Standard for Protective Coating) for ballast tanks

Keywords: ISO 9519:2023, single rungs, dog-step ladders, marine ladder rungs, ship ladders, hot-dip galvanizing, S235 steel, dimensions and tolerances, inspection.