Damage to ship's propeller - Univan

More documents

Recommendations

Info

On completion of discharging operations on 17 th night, the vessel prepared for sailing on 18 th Feb early morning. However in the final stage of unmooring on 18 th early morning, it was noticed that a wire rope was entangled in the starboard anchor. As it was not possible to disentangle the wire by manual means and required shore assistance. It was decided to re-moor the vessel. Port Anchor 3 Shackles on deck. Current E x 2.9 Kts RE-MOORING PATTERN Fwd mooring buoys Modified temporary mooring arrangement while clearing fouled anchor. Aft mooring buoys This re-mooring consisted of ropes leading to set of two buoys on starboard bow. Another set of two ropes was passed to two buoys on starboard quarter. The port anchor was heaved up to 3 shackles so as to pull the vessel’s bow out of multi buoy mooring (4 buoys) towards the port side. The starboard anchor was hanging with the fouled wire rope. The ships heading on completion of re-mooring was 290 (T). Page 2 of 5
Later on 18 th Feb morning the starboard anchor was cleared and vessel was prepared to unmoor and sail outwards. Main Engines were tried out and order for SBE given at 0936 hours. Prior Unmooring two tugs “Mississippi (60 T Bollard Pull)” and “Providence (40 T Bollard pull)” were made fast on port bow and port quarter respectively. Vessel let go and pick up her stern ropes which were both leading on starboard quarter. On letting go the stern ropes the ships heading was observed to be 260 (T) as the ships had swing to port slightly. After this the head lines which were leading to starboard bow were let go and picked up. After this vessel proceeded to pick up her port anchor. As per ships deck log book port anchor was aweigh at 1012 hours LT. Following are the ME movements given and recorded in telegraph logger) TIMING HOURS MINS SEC ORDER/ACKNOWLEDGED BY ME (UTC=SMT+6) 16.11.41 D S AHD 16.14.52 S AHD 16.15.18 H.AHD 16.15.43 F.AHD 16.16.32 0 RPM (RPM has dropped from 55 RPM to Zero) Thereafter, Master put his Engine Order telegraph to “Stop” realizing that ME RPM has either dropped to Zero due to hitting some obstruction or ME is not responding. Master then took up the ME RPM in stages to Full Ahead. At 1030 hours LT Cooper Consolidated reported to the vessel that a port aft midstream buoy was adrift as its chain had apparently been struck by the ships propeller whilst carrying out unberthing maneuver. As per Cooper Consolidated the Pilot acknowledged the contact with buoy. Following facts need to be borne in mind- Sailing draft- F-4.00/A-6.45 meters. Propeller Immersion- About 5.70 meters. Diameter of the propeller- 5.45 meters. Propeller shaft diameter-900 mm. Weight of the propeller- 11 MT. Rated torque of propleller-14 MT. Cause Analysis: On re-mooring the ship was lying outside the 4 buoy mooring pattern. Both head ropes were leading to starboard bow and both stern ropes were leading to starboard quarter. The weight was on port anchor which had 3 shackles in water. Therefore though the ropes leading aft were showing a paid out length of 70 & 40 Starboard and port aft rope respectively) meters the actual horizontal clearance of ship from buoys was much less as the lead of ropes was at an obtuse angle as ship was not squarely placed within the buoy pattern. At this position ships heading was 290 (T) as per ship’s records. Once the stern lines followed by head lines were let go the ship turned to port to face the stream and ride the port anchor. This turn to port and tightening of the port chain brought the ships stern closer to port aft buoy. The ship’s log shows port anchor aweigh time as 1012 LT (1612 UTC). Page 3 of 5
Page 1: File No CR-15-009 Prep: SJ/NH Rev:
Page 5: ROOT CAUSE OF THE ACCIDENT 1. Failu

Damage to ship's propeller - Univan

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?