ISO 23121-2:2019

Ships and marine technology — Inflatable buoyancy support systems against flooding of ships — Part 2: Buoyancy chamber

This document specifies general requirements, the materials and test methods for the buoyancy chamber of inflatable buoyancy support systems, which serve residual buoyancy for damaged ships not to sink or capsize, and which can be installed in machinery spaces and/or cargo holds.

Titre manque — Partie 2: Titre manque

General Information

• Status: Published
• Publication Date: 15-Dec-2019
• ICS: 47.020.10 - Hulls and their structure elements
• Technical Committee: ISO/TC 8/SC 8 - Ship design
• Drafting Committee: ISO/TC 8/SC 8 - Ship design
• Current Stage: 6060 - International Standard published
• Start Date: 16-Dec-2019
• Due Date: 15-Jan-2021
• Completion Date: 16-Dec-2019

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 23121-2
First edition
2019-12
Ships and marine technology —
Inflatable buoyancy support systems
against flooding of ships —
Part 2:
Buoyancy chamber
Reference number
ISO 23121-2:2019(E)
©
ISO 2019

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ISO 23121-2:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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ii © ISO 2019 – All rights reserved

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ISO 23121-2:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements . 2
4.1 General . 2
4.2 Valves . 2
4.2.1 Topping-up inflation valve . 2
4.2.2 Non-return valve . 2
4.2.3 Relief valve . 2
4.3 Indicator . 2
4.4 High pressure hose assembly (if fitted) . 2
5 Materials . 3
5.1 Metallic parts . 3
5.2 Fabrics . 3
5.3 Test methods . 4
5.3.1 General conditions . 4
5.3.2 Test specimens. 4
5.3.3 Tensile strength . 4
5.3.4 Tear test (constant rate of traverse method) . 4
5.3.5 Coating adhesion, ply separation and surface receptiveness test . 4
5.3.6 Low temperature bend test . 4
5.3.7 Porosity test . 4
5.3.8 Ageing test . 5
5.3.9 Hydrolysis test . 5
5.3.10 Resistance to blocking test . 5
5.3.11 Oil resistance test . 5
5.3.12 Seam strength test . 5
6 Inflation tests . 5
6.1 General . 5
6.2 Ambient temperature test . 5
6.3 High temperature test . 6
6.4 Low temperature test . 6
6.5 Pressure test . 6
6.5.1 Test for air pressure conservation . 6
6.5.2 Excess pressure test . 6
Bibliography . 8
© ISO 2019 – All rights reserved iii

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ISO 23121-2:2019(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO 23121-2:2019(E)

Introduction
This document is intended to support the development and technical implementation of various types
of buoyancy support systems.
In case of marine accidents, such as collisions and groundings, excessive damage and flooding can
cause the ship to sink, capsize or impede the use of its essential navigation equipment. As a ship has
watertight bulkheads, doors, hatches and other equipment, the consequences of flooding accidents can
usually be mitigated at the early phases of the accident. Subsequently, the progressive flooding after an
important accident can cause the sinking or capsizing of the ship.
To counter these problems, inflatable buoyancy support systems can be used, which are composed of
a gas supply system and a buoyancy chamber, where the gas supply system provides the medium for
the inflation of the buoyancy chamber. A fixed fire extinguisher can be used as a gas inlet when the
ship is at risk of sinking or overturning. When fire extinguishers are used to supply the media into the
buoyancy chamber, additional means must be available not to impair fire-fighting, following SOLAS,
Chapter II-2A, Regulation 4. Buoyancy chambers have various shapes and capacities to aid a damaged
ship’s buoyancy.
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INTERNATIONAL STANDARD ISO 23121-2:2019(E)
Ships and marine technology — Inflatable buoyancy
support systems against flooding of ships —
Part 2:
Buoyancy chamber
1 Scope
This document specifies general requirements, the materials and test methods for the buoyancy
chamber of inflatable buoyancy support systems, which serve residual buoyancy for damaged ships not
to sink or capsize, and which can be installed in machinery spaces and/or cargo holds.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1419:2019, Rubber- or plastics-coated fabrics — Accelerated-ageing tests
ISO 1421:2016, Rubber- or plastics-coated fabrics — Determination of tensile strength and elongation
at break
ISO 2231:1989, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing
ISO 2411, Rubber- or plastics-coated fabrics — Determination of coating adhesion
ISO 4674-1:2016, Rubber- or plastics-coated fabrics — Determination of tear resistance — Part 1: Constant
ra
...