Shipbuilding -- Cargo winches

Construction navale -- Treuils de charge

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ISO 3078:1974 - Shipbuilding -- Cargo winches
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* Shipbuilding - Cargo winches
Construction navale - Treuils de charge
First edition - 1974-04-01
UDC 629.12 : 621.86.863
Ref. No. IS0 3078-1974 (E)
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Descriptors : shipbuilding, winches, specifications, ratings.
Price based on 4 pages
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IS0 (the International Organization for Standardization) is a worldwide federation

of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set

up 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.

Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 3078 was drawn up by Technical Committee ISO/TC 8,
Shipbuilding, and circulated to the Member Bodies in March 1973.
It has been approved by the Member Bodies of the following countries
Australia India Poland
Austria Israel Romania
Belgium Italy Sweden
Czechoslovakia Japan T ha i la nd
Denmark Mexico Turkey
Finland Netherlands United Kingdom
New Zealand U.S.S. R.
Germany Norway
No Member Body expressed disapproval of the document.
O International Organization for Standardization, 1974 0
Printed in Switzerland
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Shipbuilding - Cargo winches

1 SCOPE AND FIELD OF APPLICATION Winches are graded according to their nominal size as given

in the performance table (see clause 5).
This International Standard specifies the characteristics of

cargo winches on cargo derricks, especially winches with If the winch is provided with a reduction gear having several

electric or hydraulic drive. gear changes, each step should correspond to a nominal

load in the performance table.
1 The nominal sizes are derived from the preferred number series.
2 The definition of the nominal size given above is not applicable
2.1 Nominal size
to heavy derricks.
The nominal size of a cargo winch corresponds to the

nominal load, i.e. the maximum working load, expressed in 2.2 Nominal speed of hoisting

tonnes, at the hook which the winch is rated to lift in direct
is the speed at which the
The nominal speed of hoisting
operations (with a single sheave at the derrick-head and a
winch is capable of lifting the nominal load.
single sheave at the foot).
The minimum nominal speeds of hoisting are given in the
performance table.
2.3 Drum load of a winch
The drum load of a winch is the maximum rope tension, in
kilonewtons (kN), measured at the drum exit when the
winch is hauling in at the nominal speed with the rope
wound on the drum in a single layer.
NOTE - The drum load is approximately 11 times the nominal load
measured in tonnes. The factor of 11 takes account of the loss
through friction due to the sheaves and of the ratio between force in
kilonewtons and mass in tonnes.
2.4 Right-hand and left-hand cargo winches
A winch is termed a right-hand winch in relation to an
observer situated on the side of the motor, power supply or
case of a symmetrical winch), when the
controller (in the
reduction gear or the drive for the drum is on the
right-hand side of the drum. (See figure 2.)
A winch is termed a left-hand winch in relation to an
observer situâted on the side of the motor, power supply or
controller (in the case of a symmetrical winch), when the
reduction gear or the drive for the drum is on the left-hand
FIGURE 1 - Example of use of a winch side of the drum.
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1 IS0 3078-1974 (E)
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FIGURE 2 - Examples of right-hand winches

3 DESIGN AND OPERATION OF A WINCH 3.4.2 The braking system shall be capable of effectively

arresting and holding a load at least 1,5 times the nominal
3.1 Stress calculation . load.
Means shall also be provided for lowering the load in the
The stress calculation of the mechanical parts is based on :
event of power failure.
3.1.1 The drum load of the winch: in which case the
allowable calculated stresses based on simple elastic theory
3.4.3 Winches with a declutchable drum shall be provided
of any part of the winch must not be greater than 0,4 times
with a locking device, or a brake on the drum capable of
the 0,2 % proof stress of the material.
preventing the rotation of the drum.
When a brake is required to hold the load, this shall be
3.1.2 The maximum torque of the motor corresponding to
by the purchaser.
the most severe working conditions: in which case the
allowable stresses shall be within 0,9 times the 0,2 % proof
3.4.4 The braking system shall be such as not to induce a
stress of the material.
shock load.
3.2 Direction of motion of the operating devices
3.5 Drum design
The direction of motion of the operating devices shall be

such that the load is raised by clockwise movement at a For all operating conditions, the distance between the top

hand-wheel or crank handle or alternatively

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