The winch brakes of a launching appliance shall be of sufficient strength to withstand: A static test with a proof load of not less than 1. 5 times the working load; and A dynamic test with a proof load of not less than 1. 1 time the working load at maximum lowering speed. Points to pounder: A launching mechanism shall be so arranged that it may be actuated by one person from a position on the ship's deck, and from a position within the survival craft or rescue boat. The survival craft shall be visible to the person on deck operating the launching mechanism. On lifeboats intended for free fall launching the launching mechanism shall be actuated by one person only from a position within such lifeboat. Every launching appliance shall be so constructed that a minimum amount of routine maintenance is necessary. All parts requiring regular maintenance by the ship's crew shall be readily accessible and easily maintained The launching appliance and its attachments other than winch brakes shall be of sufficient strength to withstand a static test with a proof load of not less than 2.
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If any roller bearings fail it should be completely replaced. Never strike a roller bearing with a steel hammer. A wood hammer or soft hammer should be used to strike it lightly. Lastly, the foundation of windlass should be examined after and before each anchoring operation. Over to you.. Do you know any other important point that should be added for efficient windlass maintenance? Let's know in the comments below.
Turn handle (brake handle) operation
The brake handle operation is checked for its smooth operation. Dry running
The mooring winch is subjected to dry running (without load) for five minutes. During this time it is checked for abnormal noise coming from the gear case. Also the bearings are checked for any temperature rise (overheating). The hydraulic pressure on the test supply lines and the voltage across the electric motor (driving the shore hydraulic pump) is checked. Conclusion
The outcome of the test has to be noted down and any suggestion has to be mentioned in the inspection report. External links
OCIMF (Oil Companies International Marine Forum
Sharing
During liner replacement it is very important to secure the chain and anchor with extra lashings if the ship's staff is carrying out this job at sea. The job should preferably be carried out in calm waters without any uneven rolling or pitching. When the anchor and chain is secured by the stopper and extra lashings the brake assembly can be checked. For that the brake has to be fully opened and all the pins connecting to the brake has to move smoothly, cleaning, greasing or hammering of pins may be required for this purpose. The brake nut can be used to adjust the length of brake spindle which in turn corresponds to the liner thickness. It is very important that while replacing the brake liner assembly of a windlass the position of the brake screw down lever and position of brake bands corresponding to the brake position is marked. As after replacing the liner misalignments are often observed while reassembling the whole unit. The spherical roller bearings assembled to the main shaft are precision built and care must be taken while removing them.
In rough weather it is necessary to loosen the anchor chain tension while heaving up by using engines to avoid excessive load on the windlass. In case excessive load is applied on the windlass while heaving, bring the operating lever to neutral position then pay out the cable little bit, increase engine revolutions and heave the chain again once the load reduces. Speed change for windlass from high to low will cause large speed change and thus they are constructed with utmost safety features. Real Life Incident: A Loaded Panamax sized tanker vessel was preparing to anchor at Chittagong anchorage outside the port limits. While the Master decided to let go the anchor, the mate stationed forward advised to pay out slowly using the engines. The master acknowledged mate's advise but being very experienced in such situations decided to let go the anchor and ease up the excessive loads on windlass using engines.
With hydraulic and electric driven winches, the render value is constant but with steam winches the render value varies. It should be noted that the heaving power is always less than the render force and it is thus impossible to heave in after a winch has rendered unless there is a change in the forces acting on the moorings. Many ships are equipped with self-tensioning winches with the intention of eliminating the need for line tending. These are designed so that a specified line tension can be pre-set, and the winch will render (pay out) when tension in the line exceeds this value, and will recover (heave in) when it is less than this value. However, experience has shown that the use of such winches whilst the ship is alongside is not a safe practice because the winch restraint is limited to its render load, which is small compared to what it can hold on the brake. It is possible for the winches at opposite ends of the ship to work against each other when an external force caused by either wind or current or both is applied to one end so that the ship could 'walk" along the jetty.