ODME – Oil discharge monitoring equipment
Oil tankers carry different types of oil cargo in their cargo tanks and it often happens that after discharging the oil cargo in some port, the ship sails without any cargo to some other destination. In order to do so, it has to take ballast from the sea to get better draught and stability. For this reason, ballast water is taken into cargo tanks wherein generally oil cargo would have been carried. It is to note that the ballast water carried in cargo tank has to be discharged out at sea before the next cargo loading. Therefore, Oil Discharge monitoring … Continue reading ODME – Oil discharge monitoring equipment
Pitfalls of Pump Piping design
Rule No. 1 Position the pump in an accessible location. When laying out the system, give some consideration to the people who eventually will have to look after the pump that easy access and working room for routine maintenance. Also, make sure overhead space is adequate for lifting devices and working clearance. Rule No. 2 Make the pipe diameter on both the inlet and the outlet sides of the pump at least one size larger than the nozzle itself. On the horizontal inlet side, an eccentric reducer is required to decrease the size of the pipe from the suction line … Continue reading Pitfalls of Pump Piping design
MGPS – Marine gross protection system
Marine growth in sea chests, box coolers and seawater piping systems is a potential threat for the performance and condition of your ship or installation. Blockages caused by barnacles (hầu) and mussels (trai) are expensive and time consuming to remove and can have serious consequences. Engines will run at abnormally high temperatures, resulting in unnecessary increased fuel consumption and lower performance. To combat this risk the Marine Growth Prevention System (MGPS) was developed. Once installed it provides low maintenance and continuous protection against most hard and soft foulings as well as corrosion. The Marine Growth Prevention System utilizes an impressed … Continue reading MGPS – Marine gross protection system
MARINE COROSSION AND PROTECTION (Part 2)
Continuing on MARINE COROSSION AND PROTECTION (Part 1) that we discussed about the Electro-chemical corrosion protection methods and the last remained one is called ICCP system. Reversing the current by creating an opposite potential ( ICCP : Impressed current corrosion protection ) The ICCP system, a large positive current is applied to hull and pass through the adjacent water. As a result, current flow into ship’s steel whereas it has a direct unprotected contact with seawater and inducing a Cathodic reaction that protect the steel against the corrosion. To achieve this, the Rectifier (convert AC–>DC) is connected to ship’s steel with … Continue reading MARINE COROSSION AND PROTECTION (Part 2)
MARINE COROSSION AND PROTECTION (Part 1)
To understand how marine corrosion protection works, it’s necessary to look in more detail in to the corrosion process. In this undesired chemical effect, the material can reach with different chemicals in its surroundings. The reaction can be divided into: Chemical reaction Electro-chemical reaction These reaction take place exclusively at the surface of material. It’s possible the microscopic pits are formed by corrosion on the metal’s surface.The corrosion can also occur in existing crack. CHEMICAL REACTION In chemical reaction, there’s a charge transfer between the reactions. If the exchange of charge is local effect, then the resulting ” Chemical corrosion … Continue reading MARINE COROSSION AND PROTECTION (Part 1)
MEGGER/RESISTANCE TEST
Megger test is the test that evaluate the insulation resistance quality. Insulation starts to age as soon as it’s made. As it ages, its insulating performance deteriorates. Any harsh installation environments, especially those with temperature extremes and/or chemical contamination, accelerates this process. This deterioration can result in dangerous conditions in power reliability and personnel safety. As such, it’s important to identify this deterioration quickly so that corrective steps can be taken. One of the simplest tests and its required test instrument are not universally understood. To help eliminate this lack of understanding, let’s discuss in detail Insulation Resistance (IR) testing … Continue reading MEGGER/RESISTANCE TEST
Circuit Fault and Electric integrity protection.
There’re three general faults in electric integrity, one by one to go through and we will understand the basic concept of electric installation. Open circuit Fault Due to the broken of conductor (Wire broken) Open circuit will cause the 3-phase Motor stop (Over load relay will trip the motor if the current is over the normal ). Some case the load will be increase on the remain 2-phase and burn out the motor. Protection: Do the Megger check between one point to the earth ( The wire earthed at one end already ). The result is infinity mean … Continue reading Circuit Fault and Electric integrity protection.
PUMP PRIMING (Notes)
When the centrifugal pump is not primed ( filled with liquid ) before starting, the air pocket inside the pump case may give rise to formation of vortex and discontinuity of flow those lead to make noise, vibration and damages to the impeller. Priming is done by pouring liquid in to pump casing ( when pump is not running ) through a funnel and air will be displaced through an air vent provided on pump case. The formation of air pocket inside casing can be avoided by following methods: 1 – Installation of pump below the suction level 2 – … Continue reading PUMP PRIMING (Notes)
CENTRIFUGAL PUMP (Advanced)
There’re some confusing fluid mechanic principles, you may understand it during learning individually. Meanwhile, it’s real difficult and daunting to gather and compile all the theories to design a reasonable pump configuration as the demand. In this post, we’ll break down the anatomy of all concept through the centrifugal pump curve (Characteristic curves). The pump characteristic curve shows the performance of a pump. It usually shows TDH-Total dynamic Head, Power, Efficiency and NPSHr plotted over Flow rate at a given RPM. In these diagrams you can estimate pump behavior at constant speeds and a range of impeller diameters. Constant horsepower, … Continue reading CENTRIFUGAL PUMP (Advanced)
AMARINE 