Two-stroke bearings are mainly composed of aluminum or tin-based alloys, allowing the bearing to bed and transfer the load over a broader area. If the bearing surface experiences excessive stress, the bearing shell will normally continue to function as the load is distributed across a greater area. As a result, most white metal fragment detection…
During operation of engines (especially trunk type engines) the lubricating oil will gradually be contaminated by small particles originating from the combustion and, in particular engines operated on heavy fuels which will normally increase the contamination due to the increased content of carbon residues and other contaminants (about four stroke lubricating system you can read…
A merchant ship’s design includes tanks for cargo and fuel, with a focus on maintaining stability through regular monitoring of fluid levels. Accurate tank soundings are crucial for bunkering operations to prevent financial losses due to malpractices. Manual and automated methods complement each other to ensure precise fuel measurements and optimal performance.
Every ship’s engine room is equipped with some kind of diesel engine and most big ships nowadays are powered by two-stroke diesel engines, although the usage of four-stroke engines for propulsion is increasing due to the flexibility in where they may be installed and the enhanced redundancy that a larger number of smaller engines can…
At all engine loads, the purpose of the diesel engine fuel system is to deliver the correct amount of fuel, at the correct time, to the correct cylinder in the required condition and as a result, the system must be capable of controlling the quantity, timing, period, and sequence of delivery. There must also be control…
In my previous post, we have discussed about pre-bunkering preparation and bunkering operation in particular and the described procedure applies in every port where the vessel intend to bunker. However, there are some specific requirements with regard to oil transfer onboard vessels and US authorities issue a set of rules that must be followed if…
Bunkering is a process of transferring fuel oil or lube oil in which two vessels positioned alongside each other supply fuel oil from one to another. Damage from poor bunkers and financial loss from insufficient bunker supply are key issues for the marine sector, and this because there is a lot of money involved due…
Modern massive two-stroke marine engines with fixed pitch propellers that are directly connected must be reversed, that is, the engine’s rotational direction must be changed to drive the ship ahead and astern. This is generally necessary during ship maneuvering, such as berthing, passing through canals, lock gates, and anchoring, among other things. I have received…
In order to maintain a high thermal efficiency of the exhaust gas economizers and avoid excessive soot accumulations periodical soot blowing and cleaning must be carried out. The goal of cold cracking is to cool and then heat the economizer steel structure. Because the coefficients of expansion of the boiler steel and the hard deposits…
Most of the emergency power requirements are supplied by the emergency 24V system which consists of a battery distribution board backed up by a separate 24V battery. This provides a smooth changeover to a constant power source upon loss of the ship’s main or emergency power. When the emergency source of electrical power is an…