ISO 5411:2024

Overview

ISO 5411:2024 - Ships and marine technology - Submersibles - Vocabulary establishes a common set of terms and definitions for submersibles. Rather than prescribing design or construction rules, this International Standard provides standardized terminology across the lifecycle of submersibles to improve clarity in documentation, communication, testing, training and international collaboration.

The document covers 11 aspects of submersible terminology: types, performance, structural system, mechanical system, electrical system, acoustic system, control system, surface system, work mode, test and maintenance, and personnel.

Key topics and technical content

ISO 5411:2024 is a vocabulary standard. Key technical topics and the kinds of terms defined include:

• Types of submersibles: e.g., submersible, manned submersible, tethered and untethered submersibles, transport submersible, passenger submersible, deep submergence rescue vehicle (DSRV/SRV), lock-out submersible, atmospheric diving suit (ADS), dry diving bell, seabed laboratory.
• Performance and operational terms: life expectancy, design mission time, working time, bottom time, operating depth/pressure, design depth/pressure, collapse depth/pressure, test depth/test pressure (expressed in MPa).
• Structural system vocabulary: pressure-resistant structure, pressure hull, manned compartment, viewport/window, buoyancy material, framework, bottom-sitting plate, lift point, lashing point, penetrator, seal.
• Life support and environmental systems: life support system, breathing air supply system, carbon dioxide removal.
• Support, launch and recovery: launch and recovery system, surface system, umbilical/tether terminology.
• Maintenance, testing and personnel: tightness test, hydrostatic pressure test, maintenance-related terms, and definitions for pilot, crew and divers.

Where appropriate the standard references related definitions from other documents (for example ISO 21173, ISO 22252, IMO circulars and ASME PVHO guidance used as source material).

Applications and practical value

ISO 5411:2024 is useful when stakeholders need a consistent vocabulary to reduce ambiguity and improve safety, quality and interoperability. Typical practical uses:

• Harmonizing terminology in design and procurement documents, specifications and contracts
• Standardizing operational procedures, training curricula and simulation systems
• Clarifying test, inspection and maintenance reports (e.g., hydrostatic tests, tightness tests)
• Supporting regulatory, classification and certification documentation by providing clear term definitions (note: the standard itself is not a classification or construction standard)
• Enabling international trade, R&D collaboration and technical publications by reducing misunderstandings

Who should use it

• Submersible designers and manufacturers
• Operators and fleet managers (manned and unmanned platforms)
• Test labs, maintenance teams and inspection bodies
• Regulators, classification societies and maritime authorities
• Training organizations and technical authors
• Researchers and system integrators in marine technology

Related standards

Relevant references and sources cited within ISO 5411:2024 include IMO MSC circulars, ISO 21173, ISO 22252 and ASME PVHO-1. ISO and IEC terminology databases (ISO OBP and IEC Electropedia) are also noted for broader standardization work.

Keywords: ISO 5411:2024, submersibles vocabulary, submersible terminology, ships and marine technology, pressure hull, life support system, design depth, test pressure.