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Cargo Ships Lifting appliances - Maintenance, testing, controls & safety measures
Regular Maintenance for Lifting appliances on board
Fig: Cargo Ships deck crane
In order to ensure that all parts of lifting equipment and related
equipment are kept in good repair and working order, regular preventative
maintenance should be carried out. Maintenance should include regular
examinations by a competent person. Such examinations should be carried
out as required by the Regulations but in any event at least once annually.
Checks should look for general material defects such as cracks, distortion,
corrosion and wear and tear that could affect safe working load and overall
strength.
When there is any suspicion that any appliance or item of
equipment may have been subjected to excessive loads, exceeding the Safe
Working Load (SWL), or subjected to treatment likely to cause damage, it
should be taken out of service until it can be subjected to a thorough
examination by a competent person.
Listed below are some suggested maintenance items:-
i) Greasing should be thorough and frequent, as dry bearings impose
additional loads that can lead to failure.
ii) The condition of all ropes and chains should be checked regularly for
wear, damage and corrosion and replaced as necessary.
iii) Shackles, links and rings should be renewed when wear or damage is
evident.
iv) Structures should be examined frequently for corrosion, cracks,
distortion and wear of bearings, securing points etc.
v) Hollow structures such as gantries or masts should be checked for
trapped water inside. If water is found, the structure should be drained,
appropriately treated and then sealed.
vi) Regular function tests of controls, stops, brakes, safety devices for
hoisting gear etc, should be carried out preferably before the start of
operations.
Additional items may be appropriate
dependant upon the equipment fitted to an individual vessel.
Testing of lifting appliances on board
No lifting equipment, accessory for lifting or loose gear is to be
used after manufacture or installation, or after any repair or modification
which is likely to alter the safe working load or affect the strength or
stability of the equipment, without having been first tested by a competent
person.
Upon the completion of any test of lifting equipment, accessory
for lifting or item of loose gear carried out in accordance with , the
equipment, accessory or gear shall be thoroughly examined and certified for
use by the person carrying out the test.
Additionally Ship's lifting equipment is not to be used unless it has been tested
by a competent person within the preceding five years.
Where the safety of lifting equipment depends on the installation
conditions, it should be inspected by a competent person before it is used
for the first time. Such inspections should be undertaken on initial
installation or after re-assembly at another location, to ensure that it has
been installed correctly, in accordance with any manufacturer's instructions,
and is safe for workers to operate as well as being able to function safely.
Any lifting equipment or accessory for lifting which is, or has been,
exposed to conditions which could cause deterioration in its condition
should be:-
(a) thoroughly examined
(i) in the case of lifting equipment for lifting persons or an accessory
for lifting, at least every 6 months;
(ii) in the case of other lifting equipment, at least every 12 months; or
(iii) in either case, in accordance with an examination scheme; and
(iv) whenever exceptional circumstances which are liable to jeopardise
the safety of the lifting equipment have occurred; and
(b) where appropriate, inspected by a competent person at suitable
intervals,
On some vessels, it was reported that the ship's staff had carried out unauthorised repairs to crane jibs by cropping and welding inserts over damaged or wasted sections. Crane jibs are subject to heavy, fluctuating loads and must be periodically inspected, surveyed, load-tested and certified. They are often made of high-tensile, for which special procedures have to be observed during repairs. Therefore, repairs must be carried out only in consultation with the manufacturer and classification society concerned. Any damage noticed to crane jibs must be reported to the ship owner/manager and advice sought before carrying out any kind of repair.
Controls of lifting appliances
Controls of lifting appliances should be permanently and legibly
marked with their function and their operating directions shown by arrows
or other simple means, indicating the position or direction of movement for
hoisting or lowering, slewing or luffing, etc.
Make-shift extensions should not be fitted to controls nor any
unauthorised alterations made to them. Foot-operated controls should
have slip resistant surfaces.
No lifting device should be used with any locking pawl, safety
attachment or device rendered inoperative. If, exceptionally, limit switches
need to be isolated in order to lower a crane to its stowage position, the
utmost care should be taken to ensure the operation is completed safely.
Safety measures
A powered appliance should always have a person at the controls
while it is in operation; it should never be left to run with a control secured
in the "ON" position.
If any powered appliance is to be left unattended with the power
on, loads should be taken off and controls put in "NEUTRAL" or "OFF"
positions. Where practical, controls should be locked or otherwise
inactivated to prevent accidental restarting. When work is completed, power
should be shut off.
The person operating any lifting appliance should have no other
duties which might interfere with their primary task. They should be in a
proper and protected position, facing controls and, so far as is practicable,
with a clear view of the whole operation.
Where the operator of the lifting appliance does not have a clear
view of the whole of the path of travel of any load carried by that applianc
appropriate precautions should be taken to prevent danger. Generally this
requirement should be met by the employment of a competent and
properly trained signaller designated to give instructions to the operator. A
signaller includes any person who gives directional instructions to an
operator while they are moving a load, whether by manual signals, by radio
or otherwise.
The signaller should have a clear view of the path of travel of the
load where the operator of the lifting appliance cannot see it.
Where necessary, additional signallers should be employed to giv
instructions to the first signaller.
Every signaller should be in a position that is:-
(a) safe; and
(b) in plain view of the person to whom they are signalling unless an
effective system of radio or other contact is in use.
All signallers should be instructed in and should follow a clear cod
of signals, agreed in advance and understood by all concerned in the
operation.
If a load can be guided by fixed guides, or by electronic means, or
some other way, so that it is as safely moved as if it was being controlled by
competent team of driver and signallers, signallers will not be necessary.
Positioning and installation
Permanently installed lifting equipment should not be used unless
it has been positioned or installed in such a way as to minimise the risk of
any of the following occurrences-
(a) the equipment or a load striking a worker;
(b) a load drifting dangerously or falling freely;
(c) a load being released unintentionally.
More on general cargo ship :
- Rope handling safe procedure
Ropes are made of short fibres that are spun into yarns,
which are then made into flat or twisted strands.
And the strands are spun or braided to make the finished
rope .
More .....
-
Synthetic man-made ropes and hawsers
Although natural fibre ropes are still widely used throughout the marine industry, they have been superseded by synthetic fibres for a great many
purposes. Not only do the majority of synthetic ropes have greater strength
than their natural fibre counterparts, but they are more easily obtainable
and at present considerably cheaper.
More .....
-
Natural fibre rope
All natural fibre rope is manufactured from manilla, sisal, hemp, coir, cotton
or flax fibres.The process of manufacture consists of twisting the fibres
into yarns and turning the yarns in an opposite direction to establish the
strands.
More .....
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Lay of Ropes and hawsers - Small Stuff descriptions
The lay of rope is a term used to describe the nature of the twist that produces the complete rope .The most common form of rope at sea is known as ‘hawser laid rope’ comprising three strands laid up right- or lefthanded.
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- Stresses in ship structures and how to mitigate
Heavy weights tend to cause a downward deflection of the deck area supporting the load .This subsequently produces stresses, with
consequent inward and outward deflections of supporting bulkheads,
depending on the position of initial loading .
More .....
- Anchoring safe practice
Prior approaching an area for anchoring ships master should investigate fully a suitable anchoring position and conduct a planned approach including speed reduction in ample time and orienting the ships head prior anchoring to same as similar sized vessels around or stem the tide or wind whichever is stronger . Final decision to be made on method of anchoring to be used , the number of shackles , the depth of water, expected weather and holding ground. .
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- MacGregor single-pull weather-deck hatch cover
Hatch covers are used to close off the hatch opening and make it
watertight. Wooden hatch covers, consisting of beams and boards over
the opening and covered with tarpaulins, were once used but are no
longer fitted. Steel hatch covers, comprising a number of linked steel
covers, are now fitted universally. Various designs exist for particular
applications, but most offer simple and quick opening and closing,
which speed up the cargo handling operation..
More .....
- Cargo holds access arrangement
The access shall be separate from the hatchway opening, and shall be by a stairway if possible. A fixed ladder, or a line of fixed rungs, shall have no point where they fill a reverse slope
.
More .....
- Prepare cargo holds prior loading
Washing is always carried out after the compartment has been swept. Drying time for washed compartments must be allowed for, before loading the next cargo; this time will vary with the climate, but two to three days must be expected.
More .....
- Strength and stability of the Lifting appliances
The vessel's structure, crane, derrick or other lifting device and the supporting structure should be of sufficient strength to withstand the loads
that will be imposed when operating at its maximum load moment .
More .....
- Lifting appliances - Maintenance, testing, controls & safety measures
When there is any suspicion that any appliance or item of
equipment may have been subjected to excessive loads, exceeding the Safe
Working Load (SWL), or subjected to treatment likely to cause damage, it
should be taken out of service until it can be subjected to a thorough
examination by a competent person.
More .....
- Safe operation of Lifting appliances and gears
All lifting operations must be properly planned, appropriately
supervised and carried out to protect the safety of workers.
More .....
- Derricks for lifting cargo on board
Derricks for lifting cargo on board is required to be of adequate strength and stability for each load, having regard in particular to the stress induced at its mounting or fixing points , securely anchored, adequately ballasted or counterbalanced and supported by outriggers
as necessary to ensure its stability when lifting.
More .....
- Deck cranes
Deck cranes have a number of advantages, the rigging
time being negligible, and the crane is able to pick up and land permitted
loads anywhere within its working radius. The safe working loads of cranes
is generally of the order of 10 to 15 tonnes and larger cranes are available
capable of lifts from 30 to 40 tonnes..
More .....
- Characteristics of Marine paints
Paint consists of pigment dispersed in a liquid referred to as the ‘vehicle’.
When spread out thinly the vehicle changes in time to an adherent dry film.
The drying may take place through one of the following processes..
More .....
- Protection by Means of Paints
It is often assumed that all paint coatings prevent attack on the metal
covered simply by excluding the corrosive agency, whether air or water. This
is often the main and sometimes the only form of protection; however there
are many paints which afford protection even though they present a porous
surface or contain various discontinuities. .
More .....
- Role classification societies maintaining seaworthiness of vessels
classification societies publish rules and regulations which are principally concerned with the strength of the ship, the provision of adequate equipment, and the reliability of the machinery .
More .....
- Periodic survey requirement by classification societies
To maintain the assigned class all steel ships are required to be surveyed and examined by the Society’s
surveyors at regular periods.
The major hull items to be examined at these surveys only are discussed
here..
More .....
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