Deperming has critical importance and can’t be ignored. This process is different from the types of Degaussing as it nullifies permanent magnetic field
Marine Electricity
Galvanic Corrosion
Galvanic corrosion may occur in fresh or salt water. It generally happens whenever two/or more metallic elements having unlike galvanic-voltages connects to each other electrically in the presence of an electrolyte. In other words, it can also be said that Galvanic corrosion is an outcome of the usual property of an active metal (greater in […]
Corrosion
It is generally understood that Corrosion means rust and is treated like an almost universal object of hatred. This word ‘Rust’ has been specifically reserved for iron corrosion. However, Not so many knows that corrosion is such a destructive process which affects almost all metals. Since iron is the first and most extensively used metal […]
Oxidation Corrosion
Most of the metals are naturally available in a chemically shared condition which we know as ORE. It is very usual to get an oxide, a carbonate, a sulphide or another compound in nature. In another words, we can say that most of the metals are naturally available in a mixed state. The reason for […]
Degaussing
The potency of a magnetic field is measured in terms of Gauss. Accordingly, if we define Degaussing. We can say that degaussing means the procedure to diminish the potency of a magnetic field. Any ship made from steel or a material having magnetic susceptibility is like a big floating magnet with a very high magnetic […]
Earth’s Magnetic field
We all know that the Earth has its own magnetic field. And it is due to its composition and moreover due to its core. Our Earth’s core is composed of enormously heated metals in molten state under extreme high pressure. If you are an electrical guy, you must have read this before also that application […]
Ship’s permanent magnetic field
The Earth’s magnetic field is the cause of the ship’s permanent magnetic field. The process of constructing a ship in the Earth’s magnetic field generates an appreciable amount of permanent-magnetism in the floating metal structure. Whenever there is a movement of the floating metal structure, the magnetic lines of force also move with it. This […]
Degaussing coils
The potency of a magnetic field is measured in terms of Gauss. And therefore, by definition, degausse means to reduce/eliminate the strength of the magnetic field. Degaussing coils are used to reduce the effect of Earth magnetic field on the ship’s magnetic field. A magnetic mine is activated when the earth’s magnetic field is distorted […]
Ship’s induced magnetism
The magnetic field induced in the floating structure is dependent on the potency of the Earth’s magnetic field and the layout and direction of floating structure w.r.t. the Earth’s magnetic field. As discussed earlier, The ship’s induced magnetism is also a cause of the ship’s magnetic field just like the ship’s permanent magnetism. Ships are […]
Importance of Hull protection
If we go back in history, we can understand that the man has involved himself with works and resources of sea from a long time. He has been continuously improving and producing structures for using it in such harsh conditions. Earlier, structures were manufactured by using Iron. After some time, mankind invented steel and started […]
Hull protection methods
Paints alone cannot accord complete protection to underwater hull. Areas above keel blocks are not always possible to protect by painting. Stern areas suffer erosion due to high turbulence caused by propeller. In these areas, chances of galvanic corrosion are more due to presence of bronze propeller which is directly coupled to mild steel hull […]
Sacrificial Anodes
In this type of system, the ship’s hull is forced to become a cathode with respect to electrodes that are positive with respect to the ship’s hull. The electrodes used for this purpose are Zinc, Magnesium and Aluminium, However, in all the three, Zinc is very popular. These electrodes provide galvanic current and in the […]
Theory behind Impressed current cathodic protection
Impressed current cathodic protection is a method for ship’s hull protection. But, before discussing the Impressed current cathodic protection, its important to know the theory and history of cathodic protection. Cathodic Protection is a method of controlling corrosion and is based on electrochemical process. In this method, the corrosion of the cathode is achieved by […]
Operation of Impressed current cathodic protection
Earlier, We had discussed about the theory behind the use of Impressed current cathodic protection. To refer the aforesaid post, visit https://electricalfundablog.com/blog/?p=731 . Lets discuss how the operation of Impressed current cathodic protection is carried out practically with equipments. The power to the unit is fed from the 440V AC, 60 Hz, 3 phase supply. However, […]
Probe controlled Degaussing system
Principle : Under Normal operating conditions the degaussing system is automatically controlled. However, if required, it may also be manually controlled by accepting a few restrictions. The external field changes acting on a ship can only be compensated in an optimum manner by a probe controlled degaussing system. It is therefore , we can say […]