GB/T 20895.1-2025 English PDF

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GB/T 20895.1-2025: Small craft - Stability and buoyancy assessment and categorization - Part 1: Non-sailing boats of hull length greater than or equal to 6 m
Status: Valid

GB/T 20895.1: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20895.1-2025	1394	Add to Cart	9 days	Small craft - Stability and buoyancy assessment and categorization - Part 1: Non-sailing boats of hull length greater than or equal to 6 m	Valid
GB/T 20895.1-2007	894	Add to Cart	5 days	Small craft -- Stability and buoyancy assessment and categorization -- Part 1: Non-sailing boats of hull length greater than or equal to 6m	Valid

Basic data

Standard ID: GB/T 20895.1-2025 (GB/T20895.1-2025)
Description (Translated English): Small craft - Stability and buoyancy assessment and categorization - Part 1: Non-sailing boats of hull length greater than or equal to 6 m
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: U18
Classification of International Standard: 47.080
Word Count Estimation: 70,777
Date of Issue: 2025-08-29
Date of Implementation: 2026-03-01
Older Standard (superseded by this standard): GB/T 20895.1-2007
Issuing agency(ies): State Administration for Market Regulation, National Standardization Administration

GB/T 20895.1-2025: Small craft - Stability and buoyancy assessment and categorization - Part 1: Non-sailing boats of hull length greater than or equal to 6 m

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ICS 47.080 CCSU18 National Standard of the People's Republic of China Replaces GB/T 20895.1-2007 Assessment and classification of stability and buoyancy of small boats Part 1.Non-sailboats with a hull length of not less than 6m (ISO 12217-1.2022, IDT) Released on August 29, 2025 Implementation on March 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 3.1 Basic terminology 2 3.2 Sinking and water ingress 4 3.3 Principal Dimensions, Areas, and Angles 4 3.4 State, mass and volume 6 3.5 Other terms and definitions 8 4 Symbol 10 5 Step 11 5.1 Maximum load 11 5.2 Sailing or non-sailing boats 11 5.3 Tests and calculations to be performed 12 5.4 Changes in input parameters 12 6 Tests, calculations and requirements 13 6.1 Sinking and Water Intake 13 6.2 Offset load test 17 6.3 Wind and Wave Resistance17 6.4 Wind-induced heel 19 6.5 Concave body size 19 6.6 Habitable multihull craft 21 6.7 Motor sailing boat 22 6.8 Buoyancy requirements 22 6.9 Water Monitoring and Drainage 22 7 Applications 23 7.1 Dimensioning Design Category 23 7.2 Meaning of design categories 23 Appendix A (Normative) Complete calculation method for required submerged water height 24 Appendix B (Normative) Offset Load Test Method 26 B.1 Purpose 26 B.2 Determination method 26 B.3 Method 26 B.4 Application of physical tests 30 B.5 Application of calculations 31 Appendix C (Normative) Calculation Method of Sinking Water Intake Angle 32 C.1 Choice of method 32 C.2 Theoretical Calculation 32 C.3 Approximate method for calculating sinking angles less than or equal to 60° 32 Appendix D (Normative) Methods for measuring freeboard margin 34 D.1 Definition 34 D.2 Example 34 Appendix E (Normative) Method for determining the restoring torque curve 35 E.1 Method 35 E.2 Mass and center of gravity 35 E.3 Determine by precise calculation 36 E.4 Determined by testing 37 Appendix F (Normative) Floating Test Method 38 F.1 General requirements 38 F.2 Test conditions 38 F.3 Water-filled stability test 39 F.4 Buoyancy test under water 40 Appendix G (Normative) Buoyant Materials and Equipment 42 G.1 Requirement 42 G.2 Test 42 Appendix H (Normative) Contents of the Owner's Manual 43 H.1 General Content 43 H.2 Specific content 43 Appendix I (Informative) Summary of requirements 45 Appendix J (Informative) Worksheet 47 Appendix K (Informative) Description of Concave Body Retention Water Level 61 Reference 62 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is Part 1 of GB/T 20895 “Assessment and classification of stability and buoyancy of small craft”. GB/T 20895 has been published. The following parts. --- Part 1.Non-sail boats with a hull length of not less than 6 m; --- Part 2.Sailing boats with a hull length of not less than 6 m; --- Part 3.Boats with a hull length of less than 6 m. This document replaces GB/T 20895.1-2007 "Assessment and classification of stability and buoyancy of small craft - Part 1.hull length not less than Compared with GB/T 20895.1-2007, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Added the definitions of fully enclosed boats, partially protected boats and habitable boats (see 3.1.6, 3.1.7 and 3.1.8); --- Added the definition of nominal sail area (see 3.3.8); --- Changed the definition of empty boat state (see 3.4.1,.2007 edition 3.4.1), added light boat state, maximum load, maximum load state Definitions of full load arrival state and fully loaded arrival state (see 3.4.2, 3.4.4, 3.4.5 and 3.4.6); --- Added the definitions of basic safety equipment, concave water retention level, standard equipment, and navigation (see 3.5.5, 3.5.9, 3.5.12, 3.5.14); --- Added requirements for sinking water inlet openings (see 6.1.1.3); --- Changed the offset load test (see 6.2, 6.2 of the.2007 edition); --- Changed the requirements for wind-induced heel (see 6.4.3, 6.4 of the.2007 edition); --- Added the requirements for concave body dimensions (see 6.5); --- Added tests, calculations and requirements for habitable multi-hull craft (see 6.6); --- Added tests, calculations and requirements for power sailing boats (see 6.7); --- Changed the buoyancy requirements (see 6.8, 6.5 of the.2007 edition); --- Added provisions for water monitoring and drainage (see 6.9); --- Changed the complete method of required sinking height (see Appendix A, Appendix A of the.2007 edition); --- Changed the offset load test method (see Appendix B, Appendix B of the.2007 edition); --- Changed the method for determining the restoring torque curve (see Appendix E, Appendix D of the.2007 edition); --- Changed the contents of the Owner's Manual (see Appendix H, Appendix G of the.2007 edition). This document is equivalent to ISO 12217-1.2022 "Assessment and classification of stability and buoyancy of small craft - Part 1.Craft of not less than hull length" 6m non-sailing boat. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Small Boats (SAC/TC241). This document was drafted by. The 708th Research Institute of China Shipbuilding Industry Corporation. The main drafters of this document are. Lu Zhimei, Liu Zhen, Zhao Ji, Chen Gang, Zhang Yuefeng, Li Zhaohui, Wu Qiong, Xia Wenjing, Wu Yongshun, Xia Zhaodan, Liu Xiaojian and Zhao Xiaochao. This document was first published in.2007 and this is the first revision.

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, which consists of three parts. constitute. --- Part 1.Non-sail boats with a hull length of not less than 6 m. The purpose is to give the stability of non-sail boats with a hull length of not less than 6 m. Evaluation and classification of stability and buoyancy, using this part to assess stability and buoyancy, assigning a value to each boat that matches its design load and maximum Design category (A, B, C or D) appropriate for large loads. --- Part 2.Sailboats with a hull length of not less than 6 m. The purpose is to give the stability and buoyancy of sailboats with a hull length of not less than 6 m. This part is used to evaluate the stability and buoyancy of each boat and to assign a load rating corresponding to its design load and maximum load. The design category (A, B, C or D) is appropriate for the load. --- Part 3.Boats with a hull length of less than 6 m. The purpose is to provide an assessment of the stability and buoyancy of boats with a hull length of less than 6 m This part is used to evaluate the stability and buoyancy of each boat and to assign a load rating appropriate to its design load and maximum load. Design category (C or D). Assessment and classification of stability and buoyancy of small boats Part 1.Non-sailboats with a hull length of not less than 6m NOTE. Compliance with the requirements of this document does not guarantee that the boat is 100% safe or that there is no risk of capsizing or sinking. Important Note. The electronic version of this document contains color content, which is very useful for correct understanding of the content of the document. It is recommended that you print this document on a color printer.

1 Scope

This document describes the method for assessing the stability and buoyancy of intact (i.e. undamaged) non-sail craft of not less than 6 m in length. Method for determining the buoyancy of a boat susceptible to flooding and sinking. Use this document to assess stability and buoyancy and assign each boat a design category appropriate to its design load and maximum load. (A, B, C or D). This document is applicable to the assessment and evaluation of the stability and buoyancy of boats with a length of 6m to 24m, which are mainly propelled by human or mechanical power. This document is also applicable to the assessment and classification of the stability and buoyancy of boats with a hull length of less than 6 m, if they do not meet the requirements of ISO 12217- 3 and having a deck and a concave body for rapid drainage in accordance with the requirements of ISO 11812. This document includes an assessment of the upside-down susceptibility of habitable multihull craft, the definition of feasible means of escape, and requirements for upside-down buoyancy. This document does not include. --- Inflatable boats and rigid inflatable boats covered by ISO 6185, except for references in ISO 6185 to specific clauses of ISO 12217; --- Jet skis and other similar power boats covered by ISO 13590; ---Pontoons and pedal boats; ---Sailboat surfboard; ---Surfboards, including powered surfboards; --- Hydrofoils and hovercraft when not sailing in displacement mode; ---Submersible. Note. Displacement mode means the boat is supported by hydrostatic forces only. This document does not consider or assess the effects of towing, fishing, dredging or lifting operations on stability; these will need to be considered separately (if applicable). use).

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 2893.1-2013 Graphical symbols, safety colors and safety signs Part 1.Design principles of safety signs and safety markings Then (ISO 3864-1.2011, MOD) Note. There is no technical difference between the referenced content of GB/T 2893.1-2013 and the referenced content of ISO 3864-1.2011 GB/T 8810-2005 Rigid cellular plastics - Determination of water absorption (ISO 2896.2001, MOD) Note. There is no technical difference between the referenced content of GB/T 8810-2005 and the referenced content of ISO 2896.2001 GB/T 19315-2025 Maximum loading capacity of small craft (ISO 14946.2021, IDT) ......

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