cathodic protection – Officer of the Watch

Incident Information on Broken Rudderstock due to Corrosion Fatigue

August 16, 2013 by Officer of the Watch Leave a Comment

This incident refers to a broken rudderstock due to corrosion fatigue. While at sea, the steering failed to respond. Investigations revealed that the rudder was not ίn the position as indicated by the rudder angle indicator on the bridge and in the steering gear room. An underwater inspection was carried out and the rudder was found to have an angle of 90 degrees to port. The rudder was temporarily secured, and the vessel was subsequent!y towed to the port for close-up inspection in dry-dock and for permanent repairs.

[Read more…]

Filed Under: OOW FOCUS Tagged With: cathodic protection, corrosion, DNV, rudder stock, Technical

Incident Information on Severe Bearing Damage in the Main Engine due to Spark Erosion

July 5, 2013 by Officer of the Watch Leave a Comment

This incident information refers to bearing damage in the main engine of a tanker due to spark erosion. A tanker for oil was on a voyage in the Mediterranean Sea in loaded condition. The crew noted and monitored an abnormally high temperature in one of the main engine’s crankshaft bearings. Suddenly the lubrication oil pressure sank, the oil mist escalated in the crankcase and the engine had to be shut down immediately. The ship experienced a loss of propulsion and drifted for several hours. Finally, the cargo had to be unloaded from the vessel, which was then towed to a repair yard.

Pipeline Leak – Investigation Report

July 1, 2013 by Officer of the Watch Leave a Comment

This investigation report by the US Minerals Management Service (MMS) was conducted in conjunction with the U.S. Coast Guard (USCG) and is referring to several pollution events were reported in the Main Pass Block 288 area GoM, over a three-week time period beginning 31 May 2007. On 31 May 2007, the National Response Center (NRC) received a report that indicated a 350-foot by 100-foot oil slick had been sighted in the Main Pass Block 288 area. In the following three weeks, four additional oil slicks of various sizes, color, and consistency were reported in the same area. On 23 June 2007, a major spill (the Spill) was reported to NRC in a subsequent report. The Spill covered an area 30 miles in length by 6 miles wide and was later estimated to be comprised of 187 barrels (bbls) of oil.