Mooring Winches

2020-07-19

Inspection

Check the general condition including foundation.
Check the operation of brake mechanism.
Check if all screws, connections and joints area tight.
Check the pins and spindles.
Check the sound during running.
Check the clutch mechanism.
Measure and record the brake lining thickness (e.g. 10 mm).
Check the storage, tension drums & end drums for grooves, pitting corrosion & rust scale.
Check the end drums to be free of paint.
Check the gears.
Check the oil level. Ensure that oil level is visible through oil gauge.
Check for any oil leakage.
Ensure that all grease nipples are fitted.
Check the condition of supply and return lines.
Check the wire lock condition.
Ensure hand lever free movement and that are marked with the direction of operation.
Ensure that winch identification number, design BHC, date of last brake test and rendering point force (in Tons or KN), heave & pay out indications are clearly marked.

Dismantle all the parts as per photos. De-rusting, painting, and bronze polishing as required.
Clutch mechanism rusted parts must be cleaned and greased.
Grease the nipples rotating the drum. Ensure that the old grease has been removed.
Replace damaged grease nipples if necessary.
Replace the brake lining if its thickness reaches the minimum as per maker's instructions or Company's Policy (e.g. 3 mm).
Grease all the pins.
Replace the oil if necessary using the recommended by makers. The oil / water contamination looks like milk.
Paint with yellow color the area around the nipples.
Perform brake test after maintenance.

Winch brake test shall be carried out prior ship's delivery and then on annually basis.
Winch brake test shall be carried out after maintenance, modification, brake lining renewal, mooring incident and line of different diameter installation.
The rendering point shall be set at 60% of SDMBL on the first layer for split drums mooring winches, For undivided winch drums, normal number of layers used in most mooring operations shall be taken into consideration in the calculation. The rendering point shall not exceed the 80% of maximum BHC.
Manufacturer's test kit shall be provided.
Manufacturer's procedures including calculation formula shall be provided in Deck Machinery Manual.
A marking method shall be defined to ensure that the brake is applied to the same torque at every mooring operation.
The date of last brake test and the rendering point value (in tons or kN) shall be marked on mooring winches.
Brake test results (i.e. rendering point, hydraulic pressure in jack etc.) shall be recorded in relevant SMS form.
Risk Assessment should be completed before commencement of the task.
Crew should be provided with relevant training.

BHP Mitsubishi Alliance, Mooring Winch Brake Test Guidelines. Technical Note

IMO, Guidelines for Inspection and Maintenance of Mooring Equipment Including Lines. MSC.1/Circ.1620.

INTERTANKO, Guidance on Line Management Plans (LMP)

ISO 3730:2012, Shipbuilding and marine structures - Mooring winches

OCIMF, Effective Mooring

OCIMF, Mooring Equipment Guidelines (MEG4)

OCIMF, SIRE 2.0

Rightship, Ship Inspection Questionnaire, Chapter 10, Rightship Best Practices. Available at: https://www.rightship.com/resources/best-practice/what-is-render-testing