BS EN ISO 12215-5:2019

What is ISO 12215-5 - Hull construction and scantlings about?  

ISO 12215-5 is the fifth part of the ISO 12215 series of standards which defines the dimensions, design local pressures, mechanical properties and design stresses for the scantlings determination of monohull small craft with a hull length (LH) or a load line length of up to 24 m. ISO 12215-5 will help to achieve standard structural features. ISO 12215-5 considers all parts of the craft that are assumed to be watertight or weathertight when assessing stability, freeboard and buoyancy in accordance with ISO 12217. The main core of ISO 12215-5 determines the local design pressures and stresses for monohulls and details the possible scantlings methods derived from these pressures and stresses, both for monohulls and multihulls.  

Note1: ISO 12215-5 is applicable to small craft, in intact condition, of the two following types: 

• Recreational craft, including recreational charter vessels 
• Small commercial craft and workboats 

Note2: ISO 12215-5 is not applicable to racing craft designed only for professional racing. 

Note3: ISO 12215-5 is applicable to the structures supporting windows, portlights, hatches, deadlights, and doors. 

Note4: For the complete scantlings of the craft, ISO 12215-5 is intended to be used with ISO 12215-8 for rudders, ISO 12215-9 for appendages, and ISO 12215-10 for rig loads and rig attachments. 

Note5: It is also emphasized that ISO 12215-5 should only be used to check the main structural features of a craft but should not be used as a scantlings guide. 

Who is ISO 12215-5 - Hull construction and scantlings for? 

ISO 12215-5 on hull construction and scantlings is useful for: 

• Hull manufacturers 
• Hull designers 
• Maritime authorities 
• Civil engineers 

Why should you use ISO 12215-5 - Hull construction and scantlings?  

Scantling refers to the collective dimensions of the framing to which planks or plates are attached to form the hull. Scantling will help decide the structural strength of the ship. The reason underlying the preparation of ISO 12215-5 is that standards and recommended practices for loads on the hull and the dimensioning of small craft differ considerably, thus limiting the general worldwide acceptability of craft scantlings. The implementation of ISO 12215-5 allows achieving an overall structural strength that ensures the watertight and weathertight integrity of the craft.  

 What’s changed since the last update? 

BS EN ISO 12215-5:2019 cancels and replaces ISO 12215-5:2008. 

The main changes are as follows: 

• Clarification of the scope and of many definitions, dimensions, and assessment 
• Modification of design pressures for motor and sailing craft 
• Modification of design stresses introducing kbb and kam factors 
• Incorporation of requirements for workboats 
• Improvements/clarification of the simplified method (panel assessment, hard chined sections, frameless sections, simple and double curvature, attached plating, requirements for core, etc