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Standard for Inspection of
|
Safe Working Load |
Proof Load |
Up to 10 tonnes |
2 x SWL |
Over 10 tonnes |
1.25 x SWL |
When the hoisting appliance is a crane, the proof load shall be lifted and swung as far as possible in both directions; if the jib of the crane has a variable radius, it should be tested with a proof load, as defined above, at the maximum and minimum radii of the jib; in hydraulic cranes where, owing to the limitations of pressure, it is impossible to lift a load of 25 percent in excess of the safe working load, it will be sufficient to lift the greatest possible load.
All other types of hoisting appliances may be tested with a dynamometer which shall be rigged to the appliance.
On side trawlers, the proof load shall be lifted with the ship’s normal tackle with the boom at an angle that should not be more than 15 degrees from the horizontal or the lowest practicable angle at which the boom can be worked; the angle at which the test was made shall be stated in the certificate of test; after the proof load has been lifted it should be swung as far as possible in both directions.
2) Where a dynamometer is used, it shall be one that has been calibrated to the satisfaction of a competent person not more than 12 months prior to the test, and the test shall not be regarded as satisfactory unless the indicator remains constant for a period of at least 5 minutes.
3) Wire ropes shall be tested by sample, a piece being tested to destruction, and the safe working load shall not exceed one-fifth of the breaking load of the sample tested. Test Certificates shall be provided for all wire ropes.
4) Chains, rings, hooks, shackles, blocks, swivels, pressed and socketted fittings and other integral gear (whether accessory to a machine or not) shall be tested with a proof load equal to that shown against the article in the following table.
Article of Loose Gear |
Proof Load |
|
1) |
Single Sheave Blocks |
4 x SWL |
2) |
Multi Sheave Blocks: |
2 x SWL |
SWL up to and including 25 tonnes |
||
SWL over 25 tonnes up to and including |
||
160 tonnes |
(0.933 x SWL) + 27 |
|
SWL over 160 tonnes |
1.1 x SWL |
|
3) |
Hooks, shackles, chains, rings, swivels: |
|
SWL up to and including 25 tonnes |
2 x SWL |
|
SWL over 25 tonnes |
(1.22 x SWL) + 20 |
|
4) |
Lifting beams, spreaders, frames: |
|
SWL up to and including 10 tonnes |
2 x SWL |
|
SWL over 10 tonnes up to and including |
||
160 tonnes |
(1.04 x SWL) + 9.6 |
|
SWL over 160 tonnes |
1.1 x SWL |
NOTES:
5. All Hanging Blocks i.e. Gallows Blocks, Gilson Blocks, Ice Davit Blocks, Knock-Out Blocks, Yo-Yo Blocks and Cod End Dumping Tackle are to be considered fixed gear not subject to the testing required in Section 4; they shall remain in their permanent position as tested with the proof load in Section 1 and shall not be utilized for any other purpose.
6) Safety Factors:
For all metal structural parts used when the SWL is 10 tonnes of less....... |
5 |
For all metal structural parts used when the SWL is over 10 tonnes.......... |
4 |
For wooden structural parts used............................................................... |
8 |
Chains........................................................................................................ |
41/2 |
Wire Rope................................................................................................... |
5 |
Fibre Rope.................................................................................................. |
7 |
7) After being tested, all tackle shall be examined, the sheaves and pins of blocks being removed for the purpose, to see whether any part has been injured or permanently deformed by the test.
Qualifications of Competent Persons ^
Competent Person Work Qualified for |
|
Work |
1. exclusive surveyor employed by a classification society acceptable to the Board. |
All testing and examination of gear |
|
2. Responsible person having the necessary and appropriate technical qualifications employed by:
|
The manufacture, repair and testing of gear appropriate to the qualification of the person, or field of specialization of the firm. |
|
3. Any responsible person having the experience to allow him to carry out the work of inspection satisfactorily. |
Annual thorough inspections. |
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