Ship Works - Routine Work - Maintenance Works

Calculation of Load

There are only two types of load to be lifted

• Known- there must be a Certificate of Weight or a Guaranteed Weight name plate attached.
• Estimated- Any other weight. When doing lift calculations 50% must be added to estimated weight
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Sling Angles

The above shows the loading in slings depending on the included angle. It can be seen that fitting too short a pair of slings and thereby creating too great an included angle can substantially increase the loading in the sling and cause it to fail.

You should not consider any lifting operation with an included angle greater than 90 degrees and then you should give a 1.5 factor for the slings i.e. the slings should be at least 0.75 tonne each to lift the 1 tonne weight
Choking
This effect also occurs when choking a sling

Should the choke be batterned down it is possible to generate very high included angles severely straining the sling in this area and can easily lead to failure. Should it be necessary to put a wrap on a lift for security then you always consider making 2 full turns. If this is not possible then the included angle should never be reduced below 90 degrees and a 1.5 factor should be applied to the sling.

Inspection Criteria
Eyebolt(Dynamo)

• Check Code and SWL legible
• Ensure valid test certificate
• Check Threads for wear and distortion
• Ensure minimum 1.5 threads remaining when pin home
• Ensure wear less than 8%
• Ensure no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter

Eyebolt(Shoulder)

• Check Code and SWL legible
• Ensure valid test certificate
• Check Threads for wear and distortion
• Ensure minimum 1.5 threads remaining when pin home
• Ensure wear less than 8%
• Ensure no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter

Shackle (Dee)

• Check Code and SWL legible
• Ensure valid test certificate
• Check Threads for wear
• Ensure Pin correct for body, of the same material
• Ensure pin head shoulder is well seated
• Ensure minimum 1.5 threads remaining when pin home
• Ensure wear less than 8%
• Ensure no nicks, cracks or distortions
• Check shackle not opening up
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter

Shackle (Bow)

• Check Code and SWL legible
• Ensure vald test certificate
• Check Threads for wear
• Ensure Pin correct for body, of the same material
• Ensure pin head shoulder is well seated
• Ensure minimum 1.5 threads remaining when pin home
• Ensure wear less than 8%
• Ensure no nicks, cracks or distortions
• Check shackle not opening up
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter

Masterlink

• Check Code and SWL legible
• Ensure valid test certificate
• Ensure wear less than 8%
• Ensure no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter

Padeye

• Check Code and SWL legible
• Ensure valid test certificate
• Ensure wear less than 8%
• Ensure no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Remove paint and NDT test weld as required
• Ensure no indication of heat damage or weld splatter

Sling(Chain)

• Check Code and SWL legible
• Ensure valid test certificate
• Ensure wear less than 8%
• Ensure stretch less than 5%
• Ensure Turn or twist a maximum 1/2 turn in 4 metres (hanging)
• Ensure no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter
• Ensure hooks are of the 'C' design or fitted with safety hook
• Ensure hook end is in align with shank
• Ensure hook throat opening has not increased by 15%
• Ensure hook throat shank wear less than 10%
• Ensure Clutch in good condition

Sling(Wire)

• Check Code and SWL legible
• Ensure valid test certificate
• Ensure diameter consistent over length
• Ensure no more than 5% randomly broken wires in 10 rope diameters
• Ensure no more than 3 wires broken in local group in any one strand or 6 rope diameters
• Check external wear less than 10 & of nominal
• Remove corrosion and treat as wear
• Check for excessive waviness
• Check for strand protrusion
• Check for core protrusion
• Check for localised increase in core diameter due to core deterioration
• Check for localised reduction in diameter
• Check for memory kinks
• Check for flatterned portions
• Check integrity of eyes and fittings
• Check for heat distortion
• Check for pitting and prescence of weld splatter

Sling(Web)

• Check Code and SWL legible
• Ensure valid certificate of compliance
• Check scuffing damage not excessive
• Check for chemical/contaminants damage
• Check for selvedge damage
• Check non load bearing outer sheaf of Round slings not broached
• Check for Heat and friction damage
• Check integrity of eyes and fittings
• Ensure less than 8 lines in 25mm damaged stitching
• Check for pitting and prescence of weld splatter

Sling(Multileg)

• Check Code and SWL legible
• Ensure vald test certificate
• Ensure wear less than 8%
• Ensure stretch less than 5%
• Ensure Turn or twist a maximum 1/2 turn in 4 metres (hanging)
• Ensure no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure no indication of heat damage or weld splatter
• Ensure hooks are of the 'C' deisgn or fitted with safety hook
• Ensure hook end is in align with shank
• Ensure hook throat opening has not increased by 15%
• Ensure hook throat shank wear less than 10%
• Ensure Legs are of the same length
• Ensure Clutch in good condition

 

Chain Block

• Check Code and SWL legible
• Ensure valid test certificate
• Degrease, disassemble and clean for inspection
• Ensure load Chain has wear less than 8%
• Ensure load Chain has stretch less than 5%
• Ensure load Chain has Turn or twist a maximum 1/2 turn in 4 metres (hanging)
• Ensure load Chain has no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure load Chain has no indication of heat damage or weld splatter
• Ensure hooks are of the 'C' design or fitted with safety hook
• Ensure hook end is in align with shank
• Ensure Gears in good condition
• Check chain attachements and Clevis pins
• Check bearings, pins rollers for distortion and wear
• Check pawl and ratchet for work and operation
• Ensure hook throat opening has not increased by 15%
• Ensure hook throat shank wear less than 10%

Lever Hoist

• Check Code and SWL legible
• Ensure valid test certificate
• Degrease, disassemble and clean for inspection
• Ensure load Chain has wear less than 8%
• Ensure load Chain has stretch less than 5%
• Ensure load Chain has Turn or twist a maximum 1/2 turn in 4 metres (hanging)
• Ensure load Chain has no nicks, cracks or distortions
• Remove corrosion and treat as wear
• Ensure load Chain has no indication of heat damage or weld splatter
• Ensure hooks are of the 'C' design or fitted with safety hook
• Ensure hook end is in align with shank
• Ensure Gears in good condition
• Check chain attachements and Clevis pins
• Check bearings, pins rollers for distortion and wear
• Check pawl and ratchet for work and operation
• Ensure hook throat opening has not increased by 15%
• Ensure hook throat shank wear less than 10%

Beam

• Check Code and SWL legible
• Ensure valid test certificate
• Check condition as required

Other

• Check Code and SWL legible
• Ensure valid test certificate
• Check condition as required

The following contains subjective comment on lifting operations with the Grove AT1500, telescoping crane with flyboom It does not constitute a set of instructions and does not supersede in any way LOLER of other lifting operation regulations.

Following failure of original fitwater cooled alternator a similar sized air cooled 2MW unit was fitted.

After approximately 4 months run time the unit failed in service. Prior to this bearing and winding temperatures had been elevated but within limits.

A 2500kw High speed Main Propulsion engine suffered failure by seperation of the piston Crown. Shown below is the detached crown seized in the liner.

A. The Vacuum Clamp. Used for the loading and discharging of paper reels. Considered to be the most dependable method for damage free handling of this form of cargo, the automatic vacuum clamp may be used with either gantry or luffing cranes. The system lifts from 6 12 reels of paper, entirely by vacuum action. It is entirely electrically powered and is operated from the panel in the crane cab. There is a safely element in that no people shall be allowed within the cargo handling area (see diagram).

Handling. Considerable damage to cargo may result if due care is not paid to handling. The possibility of this source of damage occurs in both loading and discharging and thus devolves on an officer to give efficient attention on all occasions.
Lack of care at port of loading may result in damage such that, though the effect is not immediately apparent, the results may begin to show during the voyage as damage not only to the specific consignment, but also to other cargo with which it is stowed. Bad handling at port of discharge not only spoils a ship's record for efficient carriage, but often lays the ship open to damage claims which could be avoided by careful supervision. The following are some of the more obvious instances of damage through bad handling.

Broken stowage explains space 'lost' in a compartment. This loss of space is due mainly to the variable sizes of packages loaded into a compartment, thus preventing a compact and uniform stow. It is most unlikely that a general cargo will provide many cases or packages of uniform size and, though all due care may be taken in stowing them, it is almost impossible to prevent loss of space between some packages, having regard to the questions of preventing crushing and shitting. This loss of space is increased in those parts of the vessel which are not conducive to compactness of stow and here broken stowage will reach a high ratio. With general cargo stowed in end holds, the triangular shape of these holds will not permit a solid or uniform slow.

With a general cargo the holds should be well swept out and any residue of a previous cargo sent up on deck and disposed of. The extent and degree of cleaning will depend upon the nature of the previous cargo. Precautions should be taken to ensure that the space is well ventilated and dry ... to this end windsails may he rigged and upper hatch covers removed or opened.

The amount of cleaning with a cargo space will depend upon the nature of the cargo which has been discharged and that which is to be loaded. Generally speaking, a hold which is ready to receive cargo should be clean and dry, well ventilated and free from any odour of the previous cargo.