Outfitting Related Structural Defects

This post is a summary of a Tanker Structure Co-operative Forum (TSCF) paper which reviews the outfitting defects of tankers and provides an analysis on potential causes and repair proposals. Service history of double hull oil tankers has revealed the fact that outfitting details are not to be neglected since about 5 in 6 defects found in the upper deck plate and stiffeners were cracks due to outfitting. Outfitting reinforcements should be considered as part of the ship structure because a failure of this kind of local reinforcement may affect even the primary structure and cause a critical failure.

2013.09.04 - Outfitting Related Structural Defects Figure 1

[Read more…]

Incident Information On Bursting of Starting Air Compressor

A starting air compressor bursted during running test, throwing pieces of steel all over the engine room. The compressor itself was beyond repairs. Two persons were injured, one of them seriously.

2013.08.30 - Incident Information Bursting of Starting Air Compressor

[Read more…]

Structure Defects on Double Hull Tankers

Double Hull tankers built in the past have experienced certain structural deficiencies. The statistics indicate that a significant number of defects, especially fractures, occurred in double hull tankers less than 10 years old. Information in this post are from a paper on “Structure Defects on Double Hull Tankers” by Philip G. Rynn of ABS, which was presented in Tanker Structure Cooperative Forum (TSCF) 2007 shipbuilding meeting. The statistical data below illustrates the type of defects known to occur in the early double hull tankers by the application of Rules prior to the IACS Common Structural Rules (CSR) and hence where the prior Rules could have been improved.

2013.08.28 - Structure Defects on Double Hull Tankers Figure 1

[Read more…]

Incident Information Regarding Fire in Engine Room

This incident refers to a fire that started in the main engine room of a merchant vessel when at sea. Both main engines were stopped by the crew. The ship had full electrical power supply during the whole event due to separate auxiliary engine room. The crew used CO2 and water to put out the fire, which was finally extinguished after approximately four hours.

2013.08.23 - Incident Information Regarding Fire in Engine Room Figure 1

[Read more…]

Incident Information on Broken Rudderstock due to Corrosion Fatigue

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.

2013.08.16 - Incident Information on Broken Rudderstock due to Corrosion Fatigue Figure 1

[Read more…]

Incident Information on Contamination of Main Engine Lubrication Oil by Seawater

This incident refers to the contamination of a ship’s main engine by seawater. The engine room bilges became flooded due to a leaking sea water pipe. Proper actions were not taken when the alarm sounded, so the leakage was first discovered when water had reached the engine room floor plates. Consequently, the leakage was stopped, bilges emptied and the ship resumed its voyage. Shortly after resuming the voyage, the main engine stopped due to low lubrication oil pressure.

2013.08.09 - Incident Information on Contamination of Main Engine Lubrication Oil by Seawater Figure 1

[Read more…]

LNG – Strategic Challenge for the Mediterranean Shipping

The approach of LNG is something rather new; it is the chicken and the egg issue. Do we need firstly the terminal, do we need firstly the fuel, do we have the appropriate ships? In order to take the decision, we need both the ships and also the terminals for LNG. I would like to highlight the important factors to be considered; social perception, financial issues, regulatory and authorization aspects, logistics scenario and the technical solutions.

2013.08.08 - LNG Strategic Challenge for the Mediterranean Shipping Figure 1

[Read more…]

Incident Information on Engine Room Flooding

This incident information refer to an engine room flooding which occurred on board a ship during preparation for cleaning of a sea water inlet filter. Cleats on the filter were released and immediately seawater flooded through the filter.

2013.07.19 - Incident Information on Engine Room Flooding Figure 1

[Read more…]

Ballast Water Treatment Systems Selection and Use

If someone wonders why to install a Ballast Water Treatment System, the answer is that it has to do with legislation; one comes from IMO and the other one from USCG. These two are the driving force for all of the suppliers to develop a system and for the shipowners to install a system at some point from today until 2016 and onwards. But before choosing a system, the available technologies have to be checked. I dare to say that nowadays the technologies are pretty mature and there are quite a few of them, so many choices exist for different shipowners, types of vessels and trading routes.

2013.07.11 - Ballast Water Treatment Systems Selection and Use Figure 1

[Read more…]

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

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.

2013.07.05 - Incident Information on Severe Bearing Damage in the Main Engine due to Spark Erosion Figure 1

[Read more…]