OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

7.5.5.1.4 Testing ~ulprnent

Typical equipment for testing the brakes is sbown in Figure 7.5, and includes tbe following items:

• Lever consisting usually of two pieces of bar as shown on the sketch. The lever is secured to
  rhe drum of the winch by means of bolts furnisbed with the test kit and fitted through holes
  provided in lbe drum flange;


• Hydraulic jack with pre sure gauge: and


• Foundal'io.n to be placed under the hydraulic jack for tbe purpose of distTibuting the load into
  the deck st ruclUre.

[t is recommended tbat complete test equipment be placed on board eacb vessel. properly stowed i.n

an appropriate location. Alternatively, the Owner may elect to procure one or (wo sets of testing

equipment for each type and size of winch and retain this equipment i.1l a convenient celllral location

for shipment to repair facililjes as required.

7.5.5.2 Me/hod DJ testing

The testing arm are bolted to Ibe flange. of tbe winch drum with th.e hydraulic jack pressed WJcler

the end of the arms at the designated location and resting on supports. The flange brake is set as

recommended i~n lhe test specificatjon. If the winches are set normally, a torque wrench should be

used. ff they are set hydraulically, the pressure gauge should first be calibrated.

Before testing, the detailed instructions for testing included in the test specification should be reviewed

and the equipment prepared accordingly. The instructions will include:

• The values for torque wrench or pressure gauge filled for selling up the brakes;


• A curve or table relating hydraulic jack (cst pressure to line pull: and


• Hydraulic jack pressure at which the brake is designed to render.

Witb the winch prepared for testing, the testing gear securely iD place and winch brakes set in ac-

cordance with (he recommendations, pressure is applied to the hydraulic jack. The winch drum is

10 be carefully observed. At the tirst sign of movement, the hydraulic pressure applied (0 the jack

is recorded and the following action taken:

• If slippage occurs at a pressure less than de~igned, the brake should be tightened or repaired
  and jack pressure reapplied;

• If the recorded pressure corresponds to the design pressure the jack should be released and the

te. t gear removed: or

• If slippage does not occur a t the design pressure, the brake selling should be adjusted so the

brake can render at the design load.

The lever should be lightweight for easy handling. Testing can be further simplified by reducing

the lever to sli ghtlY more than the drum flange radius and placing the jack directly on the wincb

foundation. A schematic of such a test arrangement is shown in Fig. 7.6. In place of the beavy

lever, a simple fitting attached to the drum flange suffices. The higher jack loads may pose a

problem for existing equipment, but provision for tbis method can easily be incorporated into new

equipment.

Once the brakes are tested and calibrated, the proper setting should be recorded. In case of coo-

venLional screw brakes, a tag should be attacbed sl.ati.ng the proper torque. For spring-applied brakes,

the spring compression distance should be recorded and tbe spring adjustment mechanism secured

with a seal.