Ships and marine technology — Launching appliances for free-fall lifeboats

ISO 22673:2008 defines certain terms for launching appliances for free-fall lifeboats and specifies the requirements for design, construction, acceptance, examination, performance, operation and maintenance. ISO 22673:2008 is applicable to the launching appliances which use inclined ramps to launch free-fall lifeboats from ships and from offshore platforms.

Navires et technologie maritime — Engins de mise à l'eau des embarcations de sauvetage par chute libre

General Information

Status
Published
Publication Date
03-Mar-2008
Current Stage
9093 - International Standard confirmed
Start Date
22-Oct-2018
Completion Date
22-Oct-2018
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ISO 22673:2008 - Ships and marine technology -- Launching appliances for free-fall lifeboats
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INTERNATIONAL ISO
STANDARD 22673
First edition
2008-03-15
Ships and marine technology —
Launching appliances for free-fall
lifeboats
Navires et technologie maritime — Engins de mise à l'eau des
embarcations de sauvetage par chute libre
Reference number
ISO 22673:2008(E)
ISO 2008
---------------------- Page: 1 ----------------------
ISO 22673:2008(E)
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© ISO 2008

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ii © ISO 2008 – All rights reserved
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ISO 22673:2008(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope ......................................................................................................................................................1

2 Normative reference ..............................................................................................................................1

3 Terms and definitions ...........................................................................................................................2

4 Performance ...........................................................................................................................................2

4.1 Free-fall launching of lifeboat (hereinafter simply frerred to as free-fall launching)......................2

4.2 Recovery of lifeboat ..............................................................................................................................3

4.3 Controlled launching of lifeboat...........................................................................................................3

4.4 Stowage of lifeboat................................................................................................................................3

4.5 Float-free launching of lifeboat ............................................................................................................3

5 Design and construction.......................................................................................................................3

5.1 General requirements............................................................................................................................3

5.2 Construction...........................................................................................................................................4

5.3 Launching ramp.....................................................................................................................................4

5.4 Arm..........................................................................................................................................................4

5.5 Winch ......................................................................................................................................................5

5.6 Loose gears............................................................................................................................................5

5.7 Lashing gears.........................................................................................................................................6

5.8 Embarkation platform............................................................................................................................6

5.9 Operation ................................................................................................................................................6

6 Test method............................................................................................................................................6

6.1 Test of winch..........................................................................................................................................6

6.2 Test of loose gears ................................................................................................................................6

6.3 Test of launching appliance .................................................................................................................6

7 Acceptance code ...................................................................................................................................9

7.1 Prototype test.........................................................................................................................................9

7.2 Production test.....................................................................................................................................10

8 Inspection and maintenance ..............................................................................................................10

9 Marking .................................................................................................................................................11

Bibliography ......................................................................................................................................................12

© ISO 2008 – All rights reserved iii
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ISO 22673:2008(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 2.

The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent

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

ISO 22673 was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee

SC 4, Outfitting and deck machinery.
iv © ISO 2008 – All rights reserved
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ISO 22673:2008(E)
Introduction

This International Standard forms a code of practical interpretation and amplification of the requirements of the

convention for the Safety of Life at Sea (SOLAS), to provide an identical basis for design, manufacture and

acceptance of launching appliances for free-fall lifeboats for use by ship-owners, shipbuilders and appropriate

organizations.

This International Standard provides the design requirements for launching ramp length and angle. According

to 6.1.4.7 of the LSA Code, the secondary launching appliance can use both the ship’s main and emergency

power supplies, so it is significant to admit the conviction that boat handling appliances can be independent of

launching ramps. A simulated launching test and strip for inspection are supplemented in the test method.

This International Standard includes requirements of lifeboat stowage, arrangement on board, inspection and

maintenance because the launching appliances for free-fall lifeboats are closely related to ships.

This International Standard is mainly based on amendments to SOLAS 1974, dating from 1983 to 1996, and

[1] [2] [3]

relevant IMO resolutions and protocols, especially Res.MSC.47(66) , Res.MSC.48(66) , Res.MSC.81(70) ,

[4] [5] [6]

Res.MSC.216(82) and Res.MSC.218(82) . This International Standard also refers to MSC/Circ.980 ,

MSC/Circ.1205 and MSC/Circ.1206.
© ISO 2008 – All rights reserved v
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INTERNATIONAL STANDARD ISO 22673:2008(E)
Ships and marine technology — Launching appliances
for free-fall lifeboats
1 Scope

This International Standard defines certain terms for launching appliances for free-fall lifeboats (hereinafter

simply referred to as free-fall launching appliances) and specifies the requirements for design, construction,

acceptance, examination, performance, operation and maintenance.

This International Standard is applicable to the launching appliances which use inclined ramps to launch

free-fall lifeboats (hereinafter simply referred to as lifeboats) from ships and from offshore platforms.

2 Normative reference

The following referenced documents are indispensable for the application 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 2944, Fluid power systems and components — Nominal pressures

ISO 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols

ISO 4413, Hydraulic fluid power — General rules relating to systems
ISO 4414, Pneumatic fluid power — General rules relating to systems

ISO 15516 Ships and marine technology — Launching appliances for davit-launched lifeboats

IEC 60092 (all parts), Electrical installations in ships
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)

IMO LSA Code, International Convention for the Safety of Life at Sea (SOLAS) 1974

Marpol 73/78, International Convention for the Prevention of Pollution From Ships, 1973

MSC.1/Circ.1205, Measures to prevent accidents with life-boats

MSC.1/Circ.1206, Guidelines for developing operation and maintenance manuals for life-boat systems

© ISO 2008 – All rights reserved 1
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ISO 22673:2008(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 3828, ISO 15516, IMO LSA Code

and the following apply.
3.1
maximum working load

load applied to the ramp or loose gear of a free-fall launching appliance when it launches the boat of the

maximum all-up weight for which it is designed
3.2
maximum recovering load

load applied to the loose gear of a free-fall launching appliance in order to recover the non-loaded boat with

the operating crew of the maximum all-up weight for which it is designed

NOTE The minimum operating crew compliment is three persons, their average mass being 75 kg.

3.3
lightest launching load

load applied to the ramp or loose gear of a free-fall launching appliance when it launches the non-loaded boat

of the minimum all-up weight for which it is designed
3.4
maximum working load of winch

load applied to the exit end of the falls on the outmost layer at the winch drum of a free-fall launching

appliance under any working condition
3.5
hoisting load of winch

load applied to the exit end of the falls on the outmost layer at the winch drum of a free-fall launching

appliance when it hoists the maximum recovering load by means of its arms and falls

3.6
launching load of winch

load applied to the exit end of the falls on the outmost layer at the winch drum of a free-fall launching

appliance when it launches the maximum working load by means of its arms and falls

3.7
lightest launching load of winch

load applied to the exit end of the falls on the outmost layer at the winch drum of a free-fall launching

appliance when it launches the lightest launching load by means of its arms and falls

4 Performance

4.1 Free-fall launching of lifeboat (hereinafter simply frerred to as free-fall launching)

4.1.1 A free-fall launching appliance shall, by means of launching ramps, be capable of safe free-fall

launching the fully-loaded boat (equivalent to maximum working load) and/or the non-loaded boat (equivalent

to lightest launching load) from the stowed position, against a trim of up to 10° and a list of up to 20° either

way, independent of any means other than gravity or stored mechanical power which, in turn, is independent

of the ship's power supply. It shall also be capable of enabling the lifeboat to be effectively clear of the ship

after entry into the water.

4.1.2 Notwithstanding the requirement of 4.1.1, a free-fall launching appliance for oil tankers, chemical

tankers and gas carries with a final angle of heel greater than 20° calculated in accordance with MARPOL

73/78, shall be capable of free-fall launching of the fully-loaded boat or the non-loaded boat at the final angle

of heel on the lower side of the ship taking into consideration the final damaged waterline of the ship. It shall

also be capable of enabling the lifeboat to be effectively clear of the ship after entry into the water.

2 © ISO 2008 – All rights reserved
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ISO 22673:2008(E)

4.1.3 A free-fall launching appliance shall be capable of simulating launching of the lifeboat stationed on the

ramp, without allowing the lifeboat to fall into the water.
4.2 Recovery of lifeboat

A free-fall launching appliance shall be capable of recovering a non-loaded lifeboat with crew (equivalent

maximum recovering load) by power, from the water to its stowed position under ship conditions of

approximately even keel.
4.3 Controlled launching of lifeboat

Each free-fall launching appliance shall be provided with a secondary means of launching the fully-loaded

boat and the non-loaded boat by means of arms and falls under control, against a trim of up to 2° and a list of

up to 5° either way, from its stowed position, into the water. Such means can use the ship’s main and

emergency power supplies.
4.4 Stowage of lifeboat

4.4.1 A free-fall launching appliance shall be so designed and arranged that the distance from the lowest

point on the lifeboat it serves, to the still water's surface does not exceed the lifeboat’s free-fall certification

height.

4.4.2 The lifeboat shall not only be held securely in its stowed position, but also be constantly in a ready-to-

launch state so that two crew members can complete the preparation for embarkation and launching the

lifeboat within 5 min.
4.5 Float-free launching of lifeboat

Where a free-fall launching appliance is designed to float free, the float-free release of the lifeboat from its

stowed position shall be automatic.
5 Design and construction
5.1 General requirements

5.1.1 A free-fall launching appliance shall be constructed from materials that are not damaged in the air

temperature range −30 °C to +65 °C.

5.1.2 Materials of a free-fall launching appliance which are exposed to the weather shall be resistant to

deterioration and corrosion, or protected by galvanizing and other safeguarding means.

5.1.3 Equipment that is likely to be immersed in seawater such as hydrostatic release units and weak links

shall operate in the seawater temperature range −1 °C to −30 °C.

5.1.4 The major structural members, such as ramps, arms, sheave racks, etc., shall be made from

materials in the form of steel plates, tubes or profiled bar that meet the requirements for seagoing conditions

and have the satisfactory weldability. Their minimum thickness shall be not less than 6 mm. The major

structural members shall be designed with a factor of safety of not less than 4,5 on the basis of the maximum

working load assigned and the ultimate strengths of the materials used for construction.

5.1.5 Loose gears, such as lifting beams, blocks, chains, links, shackles, hooks, padeyes, etc., shall not be

made from cast and/or similar fragile materials. Loose gears shall be designed with a factor of safety of not

less than 6 on the basis of the maximum working load assigned and the ultimate strengths of the materials

used in connection with launching equipment.

5.1.6 Each free-fall launching appliance shall remain effective for life-saving under conditions of icing.

© ISO 2008 – All rights reserved 3
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ISO 22673:2008(E)

5.1.7 Each free-fall launching appliance shall be so constructed that only a minimum amount of routine

maintenance is necessary. All parts requiring regular maintenance by the ship’s crew shall be readily

accessible and easily maintained.
5.2 Construction

For the purpose of meeting the performance requirements as specified in 4.1 to 4.4, each free-fall launching

appliance shall have four functions: viz, free-fall launching, recovering, controlled launching, lifeboat stowage.

Therefore, the construction of a free-fall launching appliance shall consist of two major portions: the launching

ramp and the boat recovery/launching appliance. The two portions are usually designed to be integrated into

one unit, but sometimes can be designed to be constructed separately with independent performance.

Notwithstanding the design, the four functions as mentioned above shall be provided with, and all relevant

performances shall be in compliance with, the accorded requirements of this International Standard.

5.3 Launching ramp

5.3.1 The launching ramp shall be designed and arranged according to the parameters provided by the

manufacturer of the lifeboat and certified by the approving authority in order to protect the occupants in the

lifeboat from harmful acceleration forces resulting from free-fall launching, and to ensure the lifeboat’s

effective clearing of the ship after entry into the water.

With the ship on an even keel, the angle between the horizontal and the launch rail of the lifeboat in its

launching position shall be equal to the certified launching ramp angle. This angle shall not be less than 30°.

With the ship on an even keel, the distance from the stern of the lifeboat in its launching position to the lower

end on the ramp shall comply with the requirements of the certified launching ramp length.

5.3.2 The launching ramp shall be so designed and arranged that only one release hook is used to link the

lifeboat to th
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