GB/T 20895.1-2025 Active National standards

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

Publish Date: 2025-08-29 Implement Date: 2026-03-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 20895.1-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: The overall structure of a small ship

ICS Name: \n Small boat

Publish Date: 2025-08-29

Implement Date: 2026-03-01

Pages: 72 pages

Scope

This document describes the methods for evaluating the stability and buoyancy of non-sailing boats with a complete (i.e., undamaged) hull length of not less than 6 m, and also includes methods for evaluating the buoyancy of boats prone to waterlogging and sinking. By using this document to evaluate stability and buoyancy, a design category (A, B, C, or D) appropriate to the boat's design load and maximum load is assigned to each boat. This document applies to the evaluation and classification of stability and buoyancy for boats with a hull length of 6 m to 24 m, primarily powered by human or mechanical propulsion. It also applies to the evaluation and classification of stability and buoyancy for boats with a hull length of less than 6 m, provided they do not meet the design categories specified in ISO 12217-3 and are equipped with a deck and rapid water discharge recesses that comply with ISO 11812 requirements. This document includes the evaluation of the capsizing sensitivity of habitable multihull boats, the definition of feasible escape methods, and requirements for capsizing buoyancy. This document does not include: ——— Inflatable boats and rigid inflatable boats covered by ISO 6185, except for references to specific clauses of ISO 12217 in ISO 6185; ——— Water motorcycles and other similar powered boats covered by ISO 13590; ——— Paddleboats and pedal boats; ——— Windsurf boards; ——— Surfboards, including powered surfboards; ——— Hydrofoil boats and air-cushion vehicles not navigating in displacement mode; ——— Submarines. Note: Displacement mode refers to a boat supported solely by hydrostatic forces. This document does not consider or evaluate the impact of towing, fishing, dredging, or lifting operations on stability. Such situations should be considered separately (if applicable).