Ships and marine technology — Hydrostatic release units

This International Standard specifies performance and testing requirements for hydrostatic release units used in conjunction with float-free lifesaving appliances including inflatable liferafts and Emergency Position Indicating Radio Beacons (EPIRB 's). Hydrostatic release units which comply with this International Standard and which have been formally approved by the cognizant Maritime Safety Administration may be considered to comply with the 1974 Safety Of Life At Sea Convention (SOLAS 74) and the IMO Life-Saving Appliances Code, as amended.

Navires et technologie maritime — Dispositifs de largage hydrostatique

General Information

Status
Published
Publication Date
30-May-2001
Current Stage
9093 - International Standard confirmed
Start Date
31-Jul-2006
Completion Date
22-Jun-2022
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ISO 15734:2001 - Ships and marine technology -- Hydrostatic release units
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INTERNATIONAL ISO
STANDARD 15734
First edition
2001-06-01
Ships and marine technology — Hydrostatic
release units
Navires et technologie maritime — Dispositifs de largage hydrostatique
Reference number
ISO 15734:2001(E)
© ISO 2001
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ISO 15734:2001(E)
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© ISO 2001

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ii ISO 2001 – All rights reserved
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ISO 15734:2001(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

International Standard ISO 15734 was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 1, Lifesaving and fire protection.
ISO 2001 – All rights reserved iii
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INTERNATIONAL STANDARD ISO 15734:2001(E)
Ships and marine technology — Hydrostatic release units
1 Scope

This International Standard specifies performance and testing requirements for hydrostatic release units used in

conjunction with float-free lifesaving appliances including inflatable liferafts and Emergency Position Indicating Radio

Beacons (EPIRB 's). Hydrostatic release units which comply with this International Standard and which have been

formally approved by the cognizant Maritime Safety Administration may be considered to comply with the 1974

Safety Of Life At Sea Convention (SOLAS 74) and the IMO Life-Saving Appliances Code, as amended.

2 Normative reference

The following normative document contains provisions which, through reference in this text, constitute provisions of

this International Standard. For dated references, subsequent amendments to, or revisions of, any of these

publications do not apply. However, parties to agreements based on this International Standard are encouraged to

investigate the possibility of applying the most recent edition of the normative document indicated below. For undated

references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain

registers of currently valid International Standards.
ISO 9227:1990, Corrosion tests in artificial atmospheres — Salt spray tests.
3 General requirements
3.1 Construction

A hydrostatic release unit used in the float-free arrangements of a survival craft or EPIRB shall be so constructed that

— the materials used are compatible so as to prevent malfunction of the unit; particular care shall be taken to

ensure that metallic-coated parts are not used where damage to the coating from contact with other parts could

adversely affect the functioning of the unit,

— it has drains to prevent the accumulation of water in the hydrostatic chamber when the unit is in its normal

position,

— each structural part connected to the painter system has a strength not less than that required by the painter,

— it can readily be removed for replacement or annual servicing,

— materials and components shall be corrosion-resistant and not affected by seawater, oil or detergents,

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— it can function properly throughout an air temperature range of− 30 C to + 65 C,

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— it can function properly throughout a seawater temperature range of− 1 C to + 30 C,

— it can automatically release the float-free lifesaving appliance at a depth of not more than 4m, and

— it cannot release prematurely when seawater washes over the unit.
3.2 Markings
The unit shall be marked permanently on its exterior with
— its manufacturer, type, and serial number,
— a means of identifying its date of manufacture,
ISO 2001 – All rights reserved 1
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ISO 15734:2001(E)

— the maximum-capacity liferaft with which the unit may be used, if the unit has such a limitation, and

— a means of indelibly marking its date of expiry, if it is of the disposable type.

3.3 Servicing record plate

If the unit is of a type which requires annual servicing, it shall be provided with a permanently attached plate to

maintain a record of servicing.
3.4 Operating and maintenance instructions

Operating and maintenance instructions and information shall be provided in a clear and concise form in the

appropriate language or languages and shall include the following:
— general description of the unit;
— installation instructions;
— any on-board maintenance requirements;
— servicing requirements.
3.5 Weak link
3.5.1 Materials

A weak link used in conjunction with a hydrostatic release unit in a float-free arrangement shall

— be made from a material which is corrosion-resistant and not affected by seawater, oil or detergent,

— have the ends either whipped or heat treated, when made of cordage, and

— have each end looped around a thimble and secured with a locking ferrule, when made from a flexible wire.

3.5.2 Strength

A weak link used in conjunction with a hydrostatic release unit in a float-free arrangement of an inflatable liferaft shall

be of sufficient strength to
— pull the painter out of the liferaft container,
— operate the liferaft inflation system, and
— break under a tensile force of between 1,8 kN and 2,6 kN.
4 Prototype tests
4.1 Technical tests
4.1.1 Testing sequence

At least two prototype hydrostatic release units shall be tested in the sequence listed below. No parts may be

renewed or repaired between the tests.
a) Corrosion-resistance test (4.1.2).
b) Temperature cycling test (4.1.3).
c) Submergence and manual release test (4.1.4).
2 ISO 2001 – All rights reserved
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ISO 15734:2001(E)
d) Strength test (4.1.5).
e) Membrane-material technical tests (4.1.6).
4.1.2 Corrosion resistance test

The hydrostatic release units shall be exposed to a salt water spray test (5% sodium chloride solution) in accordance

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with ISO 9227, at a temperature of + 35 C� 3 C for 160 h without interruption. After completion, the hydrostatic

release units shall show no corrosion which could affect their efficient functioning, and shall

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