GB/T 20895.3-2025Small craft - Stability and buoyancy assessment and categorization - Part 3: Boats of hull length less than 6 m (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules for Standardization Documents".

Drafting.

This document is Part 3 of GB/T 20895 "Assessment and Classification of Stability and Buoyancy of Small Boats". GB/T 20895 has been published.

The following section.

---Part 1: Non-sailing boats with a hull length of not less than 6m;

---Part 2: Sailing boats with a hull length of not less than 6m;

---Part 3: Boats with a hull length of less than 6m.

This document replaces GB/T 20895.3-2007 "Assessment and Classification of Stability and Buoyancy of Small Boats - Part 3: Boats with Hull Length Less Than..." Compared with GB/T 20895.3-2007, the main technical changes in the "6m Boat" standard, apart from structural adjustments and editorial modifications, are as follows.

---Added a definition for habitable boats (see 3.1.7);

---A definition for the sinking ingress angle has been added (see 3.2.3);

---The definitions of empty boat status and maximum load have been changed (see 3.3.1, 3.3.3, and 3.3.1 and 3.3.2 in the 2007 version), and a light boat status has been added.

Definitions of the state, maximum load state, and full load arrival state (see 3.3.2, 3.3.4, and 3.3.5);

---Added basic safety equipment, hull length, nominal sail area, water level at the concave hull, standard equipment, windward area, and stability loss.

Definitions of angle and navigation (see 3.4.4, 3.4.6, 3.4.8, 3.4.9, 3.4.10, 3.4.12, 3.4.13 and 3.4.14);

---Experiments with habitable non-sailing multihull vessels have been added (see 6.2);

---Added specifications for the dimensions of non-sailboat concave bodies (see 6.4);

---A wind-induced tilt test has been added (see 6.6);

---Added requirements for water testing and removal (see 6.10);

---Added specifications for the dimensions of the concave body of the sailboat (see 7.3);

---Added requirements for sailboat capsizing buoyancy testing (see 7.8);

---Regulations on safety signs have been added (see Chapter 8);

---A method for calculating the inlet angle has been added (see Appendix B).

This document is equivalent to ISO 12217-3:2022 "Assessment and classification of stability and buoyancy of small boats – Part 3: Craftsmen with hull length less than..." A 6-meter boat.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Small Boats (SAC/TC241).

Introduction

GB/T 20895, "Assessment and Classification of Stability and Buoyancy of Small Boats," provides the assessment and classification of stability and buoyancy of small boats, consisting of three parts.

constitute.

---Part 1: Non-sailable boats with a hull length of not less than 6m. The purpose is to provide stability data for non-sailable boats with a hull length of not less than 6m.

The assessment and classification of buoyancy, utilizing this section to evaluate stability and buoyancy, and assigning each vessel a rating based on its design load and maximum buoyancy.

Design category (A, B, C, or D) suitable for large loads.

---Part 2: Sailing Boats with a Hull Length of Not Less Than 6m. The purpose is to provide information on the stability and buoyancy of sailing boats with a hull length of not less than 6m.

The assessment and classification of stability and buoyancy are conducted in this section, which evaluates each vessel and assigns it a rating based on its design load and maximum load.

Design category adapted to load conditions (A, B, C, or D)

---Part 3: Vessels with a hull length of less than 6m. The purpose is to provide an assessment of the stability and buoyancy of vessels with a hull length of less than 6m.

In addition to classification, this section assesses stability and buoyancy, assigning each vessel a classification appropriate to its design and maximum loads.

Design category (C or D).

Assessment and classification of stability and buoyancy of small boats Part 3: Boats with a hull length of less than 6m Note. Compliance with the requirements of this document does not guarantee the boat's 100% safety, nor does it guarantee that it will not capsize or sink.

Important Note. The electronic version of this document contains color-coded content, which is very helpful for correctly understanding the document's contents. Therefore, users...

This document should be printed using a color printer.

1 Scope

This document describes methods for assessing the stability and buoyancy of intact (i.e., undamaged) vessels, including methods for assessing the buoyancy of vessels prone to flooding and sinking.

method.

This document allows for the assessment of stability and buoyancy, enabling the determination of a design class for each vessel that is appropriate to its design load and maximum load.

(C or D)

This document applies to the assessment and classification of the stability and buoyancy of boats with a hull length of less than 6m that are propelled by human or mechanical power, but may be used for other purposes.

Excluding multihull sailing boats. Boats with a hull length of less than 6m and equipped with a full deck and a fast-drainage stern compartment conforming to ISO 11812 are capable of...

Choose to evaluate according to ISO 12217-1 or ISO 12217-2.In this case, a higher design category can be specified.

This document includes an assessment of the capsizing sensitivity of habitable multihull vessels, a definition of feasible escape routes, and requirements for capsizing buoyancy.

This document does not include.

---Inflatable boats and rigid inflatable boats covered by ISO 6185, and references to specific clauses of the ISO 12217 series in ISO 6185.

except;

---The motorboats and other similar powered boats covered by ISO 13590;

---Water toys;

---Canoe and kayak;

---Flat-bottomed boats and pedal boats;

--- Sailing and surfboards;

---Surfboards, including motorized surfboards;

--- Hydrofoils, wing-stabilized boats, and hovercraft when not in displacement mode; and

---Submersible.

Note. Displacement mode refers to a boat supported only by hydrostatic force.

This document does not consider or assess the impact of towing, fishing, dredging, or lifting operations on stability; such situations should be considered separately (if applicable).

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 2893.1-2013 Graphical symbols, safety colors, and safety signs—Part 1: Design principles of safety signs and markings Then (ISO 3864-1:2011, MOD) Note. The content referenced in 2893.1-2013 is not technically different from the content referenced in ISO 3864-1:2011.

GB/T 8810-2005 Determination of water absorption rate of rigid foamed plastics (ISO 2896:2001, MOD)