ISO 12215-10:2020

Overview

ISO 12215-10:2020 - "Small craft - Hull construction and scantlings - Part 10: Rig loads and rig attachment in sailing craft" specifies methods to determine design loads and design stresses for rig elements and to size rig attachments, mast steps and pillars on monohull and multihull sailing craft. Applicable primarily to recreational craft with hull length (LH) up to 24 m (or up to 24 m load line length), the standard addresses loads occurring while sailing and provides both a simplified and a developed method for assessment. Annexes include established-practice procedures for mast step/pillar and chainplate assessment.

Key technical topics and requirements

• Scope and limits
  • Applies to monohulls and multihulls up to 24 m LH (or load line length).
  • Intended for recreational/charter vessels; not for professional racing craft.
  • Considers loads during sailing only.
• Methods
  • Simplified method - practical, conservative procedures for common designs.
  • Developed method - more detailed analysis including 3‑D numerical and strength-of-materials approaches.
• Design loads and stresses
  • Procedures to determine resultant forces from sails, backstays, forestays, halyards and shrouds.
  • Calculation of heeling, righting and longitudinal moments relevant to rig attachments.
• Rig attachment components covered
  • Mast steps and mast pillars: compression, pre-stress and design compressive loads.
  • Chainplates and their structural connections: scantlings and attachment detailing.
• Documentation and units
  • Requires presentation of rigging layout, sail configurations and load assumptions.
  • Units standardized (m, m2, kg, N, N·m, N/mm2).
• Annex guidance
  • Normative annexes give established-practice calculation templates and examples for mast steps, chainplates and transverse rig elements.

Practical applications - who uses it and why

ISO 12215-10 is used by:

• Naval architects and marine engineers to size rig elements and attachment points.
• Boat builders and manufacturers to define scantlings for production craft.
• Surveyors and classification organizations assessing structural adequacy of small sailing craft.
• Charter operators and owners seeking compliance and safer rig installations.

Practical benefits:

• Ensures rig attachments are stronger than rig components to prevent structural failure or loss of watertight integrity.
• Provides conservative, repeatable procedures for design verification and certification.
• Supports both quick checks (simplified method) and detailed engineering (developed method and 3‑D analyses).

Related standards and references

• Other parts of the ISO 12215 series for hull construction and scantlings (see ISO for complete list).
• References the IMO “International Load Lines Convention 1966/2005” for load line definitions used in scope limits.

Keywords: ISO 12215-10:2020, rig loads, rig attachment, mast steps, chainplates, small craft, hull construction, scantlings, sailing craft, monohull, multihull.