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BSI B S * M A 5 5 75 l b 2 4 b b ï
0 3 3 8 4 6 4 T
W
BS
MA
55: 975
British Standard:
Marine
Series
Specification for
Ships‘deck machinery -
lifeboat winches
Contents
Foreword
Speci f icat ion
e 1 Scope
2. References
3.
Definitions
4 . Design and construc tion
5. Performance
6. Accep tance tesfs
7 . Marking
Page
1
2
2
2
2
5
5
6
Appendices
Page
A. On board acceptan ce tests and inspections
7
B. Inform ation to be provided by the
purchaser
7
Table
1 Standar d lifeboat winches
Figure
performance data
1 Types of boat winches 3
Foreword
This British Standard has been prepared under the
authority of t he Shipbuilding and Marine Industry
Standards Comm ittee and has been developed from
a proposal submitted by the B ritish Ship Research
Association.
machinery for ships and provides requirements for
the design, construction, safety, performance and
acceptan ce testing of lifeboat winches.
Other stan dards in the series are:
BS MA 30 Glossary of term s and graphical sym bols
for ships’ deck machinery
BS M A 1 Ships’ deck machinery-cargo winches
BS MA
32
Ships’ deck machinery-mooring winches
BS MA 33 Ships’ deck machinery-warping winches
BS MA 3 4 Ships’ deck machinery-cap stans
It fo rms one of a series dealing with deck
O
BS MA
35
Ships’ deck machinery-windlasses
BS MA 36 Ships’ deck mach inery-topp ing winches
BS
MA
52 Ships’ deck m achinery-accommodation
ladder winches
BS
MA
53 Ships’ deck mach inery-tow ing winches
for deep sea use
BS MA 56 Ships’ deck machinery-anchor cable
stoppers
BS
MA
57
Ships’ deck mac hinery-ro pe storage reels
CertiBatìon Attention is drawn to t he certification
facilities described o n the last page of this standard.
G r 3
British Standards Inst i tutio n
2
Park Street Lon don
W I A
2BS
Telephone O1
-629 9000
Telex
266933
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7/27/2019 BS MA 55 Lifeboat Winches
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BSI
B S * N A * S 5
75
1 6 2 4 b b î
0 1 3 8 4 6 5 1
I
BS MA 55: 975
Specif ication
NOTE 1
This standard takes into account the design
criteria listed in the Board
of
Trade now Department of
Trade-Maxine Divisio n) regul ations for davits and
launching gear,
Le.
Schedule
15
and Rufe
37
9)
of
the
Merchant Shipping Life Saving Appliances) Rules
1965
with which British registered ships comply.
NOTE 2 Users of this British Standard: Marine Series,
should note that w hile observing the requirements of
the standard they should at the same
time
ensure
compliance with such statutory requirem ents, rules and
regulations as may be applicable to the individual ship
concerned.
1
Scope
This British Standard specifies requirements for
the design, construc tion, safety, performance and
acceptance testing of lifeboat winches used for the
launching, recovery and stowage of lifeboats,
emergency lifeboats, class
C
boats, liferafts and
inflatable boats.
The standa rd does not include requirements
for the prime mover used to o perate the winch.
2. References
This
standard makes reference t o the following
British Standards.
BS 302
BS 1486 Lubricating nipples
Wire ropes for cranes, excavators
and general engineering purposes
Part
1
Lubricating nipples and
adaptors fo r use on m achinery
and vehicles
BS 1597 Radio-interference suppression
on marine installations
BS
2045 Preferred numbers
BS 2949 Rotating electrical machines for
use in ships
BS 339 9 Transformers for use
in ships
BS 513 5 Metal-arc welding of carbon and
carbon-manganese steels
BS 6883 Elastomer-insulated cables for
fured wiring in ships
BS MA
30
Glossary of ter ms an d graphical
symbols for ships’ deck m achinery
3
Defini t ions
For th e purposes of this British Standard, the term s
and their definitions given in BS
MA
3 0 apply.
Terms particularly applicable to this British Standard
are
defined as follows.
3.1
working load.
The maximum pull exerted by
the fall or falls at the winch drum during lowering,
hoisting or stowing of the lifeboat which in any
case is ta be taken as no t less than the working
load on the davit or davits divided by the velocity
ratio of the lowering tackle.
3.2 static test load. The load equivalent to 1.5
times the working load, which the w inch brake shall
be capable of lowering and holding.
3.3
emergency lifeboat. A
lifeboat not exceeding
8.5
m in length w hich is required to be k ept
ready for immediate use in an emergency on certain
classes of ship while the ship is a t sea.
3.4
nominal size.
The nearest preferred number,
expressed in tonnes, t o the working load. I t is
derived from the working load of the winch at its
design speed.
NOTE 1 The range
of
nominal sizes covered
by
the
standard
is
listed in table 1 column
1 ;
the associated
working loads are listed in column 2.
NOTE 2. The nominal sizes of lifeboat winches in table
1
have been selected from the R10 eries of preferred
numbers, see BS 2045.
4.
Design and construction
4.1 Handing of
winches.
(See figure 1 Lifeboa t
winches may be designed for right-hand or left-hand
operation.
A
winch is termed a right-hand winch in relation
to an observer situated on the side of the motor,
power supply or controller , when the reduction gear
or the drive for the drum is on the right-hand side of
the drum.
Similarly, a winch is term ed
a
left-hand winch
when the reduc tion gear or the drive for the drum is
on the left-han d side of the d rum .
4.2 Material stresses.The mmuf acturer o f the winch
shall be responsible for determining t he stre ngth
requirements of the component parts of the winch
to withstand the working load. Furthermore the
stress level in any part of the winch shall no t exceed
the tensile strength of the m aterial divided
by
4.5.
4.3 Drum design
4.3.1 Lifeboat winches may be designed with one
or two drums.
4.3.2 Winch drums shall be arranged to keep the
two rope falls separate and enable them to pay ou t
at the same rate.
4.3.3 The drum length shall be such that th e rope
can be fully accommodated in not more than two
layers, the com plete length of the rope being
evenly reeled. For lifeboats weighing less than
6500
kg (fully laden) three layers are permissible.
The purchaser shall state o n the order the length
of rope requ ired. See append ix B, item
(0.
4.3.4 Th e drum diameter shall not norm ally be
less than 16 times the rope diameter. Th e
recommended diameters are listed
in
table 1,
column 6.
4.3.5 The flange height shall be such tha t it wili
project at least 1.5 rope diameters beyond the
outerm ost layer when the rope is fully and
evenly reeled on the dru m.
4.4
rum clutch.
The drum or drums and drive
mechanism shall be so arranged that they are
disconnected from any means provided
for
power
recovery except when hoisting th e load.
7511-1.5k-B
2
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Left-hqndpowered
boat winch
BSI
B S * N A * 5 5
75 m L b 2 4 b b î O L 3 8 q b b 3
Observer pos ition
Left-hand powered doub ledrum
boat winch
Observer position
Powered symm etrical dou bledr um boat winch
BS
MA 55:
975
Right-hand powered
boat winch
Observer position
Right-hand powered doubledru m
boat
winch
Observer position
,
Observer position
Figure
1.
Types
of
boat
winches
3
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B S I B S * f l A * 5 5
I
BS MA
551975
4.5 Brake design
4.5.1
Drum brake
4.5.1.1 The winch shall be fitted with a b rake
capable of applying a braking torque sufficient to
maintain the required static test load.
4.5.1,2 The brake shall be capable of
maintaining the static test load when the winch
is unattended.
4.5.1.3
The w inch brake shall be
so
arranged that
is is normally in the ON position and returns t o the
ON
position when the control handle is no t being
operated.
4.5.1.4 Ratchet gear shall be incorporated i nto
the hand b rake mechanism and shall be fitte d with
at least two pawls or rollers.
4.5.2
Governing brake The w inch shall also be
fitted w ith a governing brake capable of
governing the low ering speed of the lifeboat t o
comply with the requirements of 5.4.
4.6
Crank handles
4.6.1 U winches shall have provision to b e driven
by one or tw o crank handles or hand wheels to
allow the lifeboat, class C oat or inflatable boat
to be recovered by hand.
4.6.2
Unpowered winches may be driven by a
portable pow er unit if required. Where a portable
power unit is used;provision shall be made for th e
transfer of the torque to the winch frame.
4.6.3 Winches serving liferafts are to be prov ided
with a manual rewind for rapid recovery of the
light hook.
4.6,4 Provision s h d also be made to allow the boat
falls to be manually unwound.
4.6.5
The w inch shall be
so
designed tha’t the crank
handle or handles are not rotated by moving parts
of the winch when th e winch is lowering the
lifeboat under gravity conditions, or hoisting the
lifeboat under power.
4.6.6 The hand crank radius should be no t less than
3
mm nor more than 450 mm so that the effort
required on the handle w hen hoisting the lifeboat
should no t generally exceed
100
N for single man
crank handles. In no case should this effort exceed
160
N.
Greater forces are permissible for a s hort
period while stowing the lifeboat.
Table 1. Standard l i feb oat winches perform ance data*
4.7
Designrope
4.7.1
This standard is based on the use of 6
x
36
galvanised steel wire rope with fibre co re as
specified in BS 302 180 kgf/mm2 tensile grade).
Rope diameters are listed in table 1, column 5.
4.7.2
The rope size shall be such tha t its minimum
breaking load (kg) is not less than six times the
working load.
NOTE.
he above requirement does not preclude the
use in service of another suitable wire rope construction,
which c omplies with a reco gnized standard.
4.8 Control methods and m ovements
4.8.1
Method of control The lifeboat w inch shall
be controlled manually.
4.8.2 Power sources Powered w inches shall be
designed for operation powered by either electric
or hydraulic drive, designated E for electric or H for
hydraulic.
4.8.3 Direction of motion of the operation devices
Ail control handles, handwheels and push buttons
shall be clearly and permanently m arked with their
purpose and m ode of o peration, unless this is
obvious from their design and purpose.
of
hoisting for crank handles or handwheels.
NOTE. Attention is also drawn
to
the International
Labour Organisation ‘Code
of
practice
on
safety and
health
in
dock work’.
4.8.4
rsh
buttons
When fitted, separate push
butto ns shall be provided for each motion of the
deck machinery, e.g. one push bu tton to haul in
and a separate button to veer.
The butto ns shall be depressed to actuate the
winch and when cancelled shall cause the m achine
to be stopp ed and effectively braked.
The positional relationship between contr ol
push button s shall be such as to represent the
action they are to initiate, e,g. a ‘raise’ butto n shall
be placed above its associated ‘lower’ butto n.
4.9
Construction. Materials used for c onstruction of
the winch shall be in accordance with the ap propriate
British Standard fo r the m aterial selected to ensure
compliance with
4.2.
4.9.1 Welding All welding shall be carried out in
accordance with the requirem ents of BS 5135.
Provision shall be made t o indicate the direction
1 2
Nominal Working
size load
kg
1
1
020
2.5
2
550
4 4 080
6
6 120
10
10200
*See note to
5.1.
3
Static test
load
kg
1 5 3 0
3 875
6 120
9
180
15 300
4 5
Rope minimum
breaking load Stee l wire
-
rope
6 X working
bad fibre core
per fall BS
302
diameter
kg mm
3
060 9
7
650 12
12 240 16
18 360 18
30 600 24
-
4
6
Recommended
drum
diameters
mm
160
200
250
315
400
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BS
MA
55:
1975
4.9.2 Access Access openings to prime m overs,
reduction gearing, bearings, brakes and co ntrol
mechanisms shall be provided t o ensure that adequa te
inspection an d maintenan ce is facilitated.
4.9.3
Lubrication
The winch shall be designed to
ensure that all bearing surfaces are capab le of being
properly lubricated d uring operation when inclined
at any angle up to 15 o in an y direction.
Adequate and accessible greasing and oiling
points shall be provided to e nsure tha t all required
surfaces are capable of being properly lubricated,
Nipples shall be in accord ance with th e requ iremen ts
of BS 1486: Part 1. Sumps and oil baths shall be
provided with sight glasses or o ther means o f
measuring
oil
level. Where necessary oil and
condens ation drain plugs shall be pro vided.
4.9.4 Electrical equipment Electrical equipment
shall be installed in accordanc e with the ‘Regulations
for electrical equipm ent of ships’, published by th e
Institu tion o f Electrical Engineers.
Electrical equipm ent shall
also
comply with the
requirements of BS 1597, BS 2949,
BS
3399 and
BS
6883.
shall be deck watertight, and d eck portable
enclosure s of electrical equipm ent shall be
weatherproof as defined in
BS
2949.
4.9.5 Protection
of
metallic surfaces
The surface
shall be free from moistur e, oil, grease, dirt, weld
spatter, burrs and other imperfections, before
applying the protective finish to m etallic surfaces.
Externa l surfaces and internal surfaces shall be
primed with an anticorrosive priming paint adequate
to provide protection against a marine environment,
as soon as practicable after com pletion of th e surface
preparation.
Internal surfaces of gear boxes shall be co ated
with an oil proof paint.
5.
Performance
5.1
The winch shall be capable of exerting the
working load listed in table 1, column 2.
NOTE.
Th e performance data contained in table
1
is
based upon the
use
of a double drum with tw o fails each
operating on a single part tackle. Where multi-part
tackle is used the winch design should be amended
accordingly.
5.2
Powered boat winches shall be capa ble of
hoisting the lifeboat with
a
speed not less than
0.05 m/s for lifeboats and with a speed not less
than 0.3 m/s for ‘emergency’ boats.
5.3
Unpowered b oat w inches shall be capable of
hoisting the lifeboat with a speed not less tha n
0.01
m/s.
5.4
The winch shall be capab le of lowerin g the
lifeboat under gravity co nditions at speeds not
less than 0.30 m/s nor greater than 0.60 m/s,
when the ship is inclined at any com bination of
angies up t o
10
o
trim and/or 1 5
o
list.
5.5
The sta tic test loads associated with the
working loads are listed in table 1, column 3, and
e
Deck mou nted enclosures of electrical equipment
a
these shall not be less than 1.5 times the working
load. (See
6.2.3.) .
6
Acceptance tests
6.1 Rules concerning fhe tes ts at manufacturer’s
works for the acceptance
of
the w inch by the
purchaser
6.1.1 The win ch shall be tested as a comp lete unit
(i.e. prim e mover, drum , gearing and controls) for
the factory test. In the case of unpowered winches,
they shall be tested by manu al means.
6.2 Factory test. The test shall conform to the
requirements of
6.2.1,6.2.2,6.2.3
and
6.2.4.
6.2.1
Test without load The winch shall be run at
l ight h e peed for a per iod of 10min, 5 min in
each direction. For the purpose of this test,
unpowered winches may be tested in conjunction
with a slave prime mov er. During the test th e
following shall be recorded on th e test
certificate.
(a) Oil tightness of joints.
(b) Temperature of bearings.
(c) Power inp ut (powered winches only).
(d) Light line speeds attained a t the drum or
d r u m .
(e) C orrect operation of the brakes and ratchet
gear.
6.2.2 Hoisting test The winch shall hoist a load
related to the weight of the lifeboat and its
required equipment at the speed stipulated in
in
5.2
to
a
height of not less than 15 m. During the
test the following shall be re corded on the test
certificate.
(a) Oil tightness of joints.
(b) T emp erature rise of bearings.
(c) Power input (pow ered winches only).
(d) Hoisting speed at each drum oc drums.
(e) Correct operation of the brakes and ratchet
gear.
6.2.3
Brake test The brake shall be applied and
a
static test load equivalent to the working load times
1.5 shall be applied to a rope secured to a nd w ound
on the drum fully and evenly reeled to the specified
two or three layers. The drum shall not r otate
and it shall be dem onstrated t ha t it is possible to
release the brake. It shall also be dem onstrated that
the w inch can slowly lower th e static test load, under
control of the brake, for at least one complete
revolution of the drum and then hold the load. The
result shall be reco rded on th e test certificate.
6.2.4 Lowering test A load equivalent to the working
load shall be applied to a rope secured to and wound
on the drum fully and evenly reeled to the
specified two or three layers. The drum shall be
declutched from the prime mover and the drum
brake released. The governing brake shall govern the
speed of descent to com ply with the requirements
of 5.4. The total lowering height for this test shall
no t be less than 15 ni.
5
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6.2.4.1 A
load of
1.1
times the working load
shall
be lowered at full governed speed of 0.6 m/s
throughout a distance of no t less than 3 m, the
hand brake being sharply and intermitte ntly
applied. At
no
time after the hand brake is
so
applied, shall the test load drop more than
1
m.
6.3 Winches fo r ‘emergency’ lifeboats,
In
addition to th e tests contained in 6.2,winches for
7.
Marking
All lifeboat winches shall be permanently marked
by means o a rating plate, prominently displayed.
The
rating plate shall contain suc h informati on as is
relevant to the winch, includin g the following.
(a) Manufacturer’s name or trade m ark,
.
reference type number and serial number.
(b) Number of this British Stand ard (BS MA 5 .
-.
i ) ówer requ ireme nts (e.g. e lectric).
(1) Rate d voltage (volts).
(2)
Rated frequency (hertz).
3)
Rated current (amperes).
4) Rated in put (watts).
I
BS
MA 55 1975
eniergqncy lifeboats shall be tested by hoisting a
load related to 1.1 times the combined weight of
the boat, its equipment and a distributed load of
1016 ka, all at th e hoisting speed stipulated in 5 2
(cj Handing (right or left).
(d) Nominal size.
(e)
Drum
capacity.
0 ype of drive.
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B S I B S* í l A* 55 75
=
l b 2 L l b b î
O L 3 ä q ï O 5
Append i x A
On board acceptance tests and inspections
I t
is
recommen ded that the ship owner should arrange
for the following inspections and tests to be carried
ou t on board the ship, to ensure that the winch is
fully operable. The winch shou ld be tested as a
complete un it (prime mover, drum, gearing and
controls) to gethe r with its associated davits sheaves
and lifeboat. h i he case of unpowered winches
they should be manually operate d.
A . l Primary inspections
A . l . l
Inspection ports should be opened and
interior of casing checked for cleanliness, surface
deterioration and foreign matte r. (For powered
winches.)
A.1.2
If fitte d, filters in hydr aulic lines shou ld be
checked for cleanliness. (For powered winches.)
A.1.3
Power connection should be checked for
tightness. (For po were d winches.)
A.1.4 Deck and casing conn ection s should be
checked for tightness.
A.1.5 Check that the correct grades of oil have been
supplied in sufficient volume for safe operation.
Sumps and oil baths should be chec ked for correct
volume of oil.
A.2
Running tests. The w inch should conforin with
the requirements of
6.2.1
when running under ship
power. (For powered winches.)
A.3
Performance test
A.3.1 The winch should be ca pable of lowering the
lifeboat from the embarkation deck into th e water
loaded with the necessary equipment a nd a distributed
load equivalent to the full number of persons it is
deemed fit to carry plus 10 of the actual weight of
the lifeboat, equ ipment and persons at a speed
defined in
5.4.
A.3.2
The winch should be tested in accordance
with
6.2.2
and
6.3
and should be seen to raise the
lifeboat at such a speed as not to cause any detriment
to th e lifeboat and associated equipment. (Powe red
winches only.)
BS MA 55:1975
A.3.3 The brakes and ratch et mechanism sho uld be
seen to operate satisfactorily.
A.3.4
The cleanliness of oil filters shou ld be no ted
after the test.
A.4 Bearings. Bearing temp eratu re rises should be
measured and c hecked against the factory test
results.
A.5 Vibration.
A t
the end of the tests, the winch
should be run through th e full range of sp eeds as a
check fo r vibration.
A.6
Additional tests. Other tests may be req uested
by the purchaser at his expense and convenienc e.
A.7 Performance certificate. A certificate of
performance should be provided by the installation
autho rity on com pletion of the tests.
Append i x B
In fo rmat io n to be provided by th e purchaser
The purchaser should provide the manufacturer of
the winch with th e following basic informatio n at the
time of the enquiry.
(a) Lifeboat winch to BS MA
55
(b) Type of drive required.
(c) Nominal size.
(d) Whether left or right handed.
(e) Type of mounting.
f )
Drum capac ity and/or distance between light
waterline and life boat d eck.
(g) Wire rope dia mete r, tensile grade and
construction, if other than that shown in 4.7.1.
(h) If additional tests are to be performed.
(i) Weight and specific duty of lifeboat
(lifeboat, emergency lifeboat, etc.)
j)Number of parts in the tackle.
(k) If variations are required from sta ndard
speed.
(1) A dditio nal paint finish required.
(m) Number of crank handles.
(n) Power su pply available.
7
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BSI
C e r t i f ic a t i o n T ra d e Ma r k
he
K i temark
The K itemark
is
the registered certification trade m ark of the British Standard s Institution. A licence
to
use the Kitemark on
or in relat ion to a product will be granted to any manufacturer or producer who demonstrates that h e can an d will be able
consistently t o m ake that product t o
a
specified British Stand ard. His capability of doing so is initially assessed by inspection
of his production process, quality control organ ization a nd test facilities, and by independen t testing of a sample of the product
against all the criteria of the relevant s tandard . Th e licensee
is
required to accept, and to operate in accordance with, a BSI
scheme of supervision and co ntrol which identifies the tesfs to be carried out during manufacture and o n the comp leted product,
and specifies the frequency of such testing. BSI carries ou t unanno unced inspection visits to the manufacturer s works and audit
testing o ft h e product, and may withdraw th e licence for any failure of the manufacturer to comply with the relevant standar d
or with the requirements of th e scheme of supervision and control. Th e presence of the Kitemark on or in relat ion to a product
isa n assurance that thego ods have been produced under
a
system of supervision,control an d testing, operatedd uring ma nufacture
and including periodical inspection of the m anufacturer s wo rks in accordance with the certification m ark sc heme of BSI.
Further particulars of the terms of licence may be obtained from the Quality Assurance Department, British Standards
Institution, Maylands Avenue, Hemel Hemp stead, Herts. HP2
4SQ.
This British Standard, having been approved by the Shipbuilding and Marine Indu stry Stand ards Committe e, was published und er
the authority of th e Executive Board on 28 November 1975.
ritish Standards Institution, 1975
ISBN:
580 08616 X
Copyright
Users of British S tanda rds are reminded th at wp yrig ht subsists in all BSI publications. No part of this publication may be
reproduced in any form without the prior permission in writing of BSI. This does not preclude the free use, in the course o
implementing th e stand ard, of necessary details such as symbols an d size, fyp e or grad e designations. Enquiries should b e
addressed to the Publications Manager,
101
Pentonville Road, Londo n
N1 9ND
(Telephone
01-837 8801;
Telex
23218).
Contract requirements
Attention is drawn to the fact that this British Standard does not purport to include all the necessary provisions of a contract.
Revision of British Standards
British Standards are revised, when necessary, by the issue either of amendment slips or of revised editions. It i s important that
users of British Standards should ascertain that they are in possession of
t he
latest amendments or editions.
Th e following BSI references relafe
to
the work on this standard:
Comm ittee reference
SME/ó
Draft for comment
73/32104.
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