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Showing posts from 2019

Sulzer RT-flex engines benefits

Benefits of Sulzer Rt-flex engines Smokeless operation Reduced running costs Lower running speeds High reliability and redundancy Common rail Fuel pumps Electronic injection control Ideal for heavy oil Exhaust valve actuation and servo oil systems Ease of installation Smokeless operation A clearly visible benefit is smokeless operation at all ship speeds. The superior combustion performance with the common-rail system is achieved by maintaining the fuel injection pressure at the optimum level right across the engine speed range. In addition, the selective shut-off of single injectors and an optimized exhaust valve timing help to keep smoke emissions below the visible limit at very low speeds.  Sulzer RT-flex engines also comply more easily with the NOX emission limit in Annex VI of the MARPOL 73/78 convention, with the best possible trade-off between fuel consumption and NOX emissions at all loads. Reduced running costs Reduced running costs of Sulzer RT-flex engine

Gravity Disc

Oils containing water can only be de-watered in a perfect manner if the bowl is accurately adjusted to the difference in densities of oil and water. The gravity disc with proper inner diameter i.e. with the diameter that corresponds to the difference in densities of the oil-water mixture to be treated should, therefore, be inserted in the bowl, This disc can be chosen from the set of disc provided with the separator. The inner diameter of the disc to be chosen can be determined by:  Calculation   Experiment The general rule is : Small diameter gravity disc when treating heavy oil Large diameter regulating ring when treating light oil Determining the size of gravity disc by calculation: For a given separating temperature, the inner diameter of the gravity disc and if the desired density of the oil can be determined from the diagram, provided that the density of the oil at a temperature ranging 15℃ and 90℃ is known. For example; Given: Density of oil at 20℃            ρ oil

Operating Principle of Centripetal pump

The centripetal pump is used in purifiers or clarifiers. It discharges the clarified oil under pressure. It operates on the reverse principle as a centrifugal pump. In a centrifugal pump, the impeller which has inclined vanes rotates in a stationary casing. The liquid being pumped flows out from within the pump through the impeller vanes channels. The reverse is the case with the centripetal pump. It is fixed to the hood of the separator and its disc which is provided with the channels is immersed in the liquid rotating with the bowl. The oil is peeled off by centripetal pump and flows into its spiral channels from outside, its kinetic energy is converted into pressure energy. When back pressure is low, the depth of immersion of the centripetal pump in the oil is small. It can, however, be increased by throttling the valve in the discharge line. In this way, a good liquid seal is obtained and the liquid does not come into contact with the air and remains free of foam. In addition

Operating Principle of Separator?

Liquid-liquid and liquid-solid mixtures can be separated in settling tanks y gravity or in centrifugal separators by centrifugal force, provided that the components of the feed liquid have different densities. Since the centrifugal force developed by centrifugal is many thousand times the force of gravity, separation by centrifuging is accomplished many thousand times faster than by natural settling and takes place in seconds. Clarification Principle: If a liquid-solid mixture is poured into a stationary vessel, the solid particles, bring heavier, will slowly sink to the bottom under the action of gravity.  The larger the settling area and the shallower the vessel, the shorter will be the settling time required to achieve a certain degree of clarification for a specified volume of liquid. The greater the difference between the densities of the liquid and the solids, the more effective will be clarification. In a rotating vessel, the solid particles subjected to centrifugal forc

Difference Between A, B & C-Class Divisions?

IMO Symbol A Class Division  IMO Symbol B Class Division  SOLAS has tables for structural fire protection requirement of bulkheads and decks. The requirements depend on the spaces in question and are different for passenger ships and cargo ships. The Administration has required a test of a prototype bulkhead or deck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise. Types of Divisions: "A" Class "B" Class "C" Class "A" Class: "A" class divisions are those divisions formed by bulkheads and decks which comply with the following criteria: They are constructed of steel or equivalent material They are suitably stiffened They are constructed as to be capable of preventing the passage of smoke and flame to the end of the one-hour standard fire test. they are insulated with approved non-combustible materials such that the average tempera

MEO Class 4

Safety: Solas New Reg. For bulk carrier Docking plug 10 yr maintenance in co2 bottle ad how to pressure test in shore SOx ad NOx reduction Fire wallet ASDU Medical assistance publication name Fixed foam Solas regulations Smoke signal chemical composition Mob marker regulation Iopp renewal survey details Foam system solas regulation, fire hydrant, foam monitor, also educator and proposnator difference.  Port state and flag state difference SOPEP regulation & duties  SBT and clean ballast difference. ORB both Motor: manual purifier desludge and check during desludge bilge pump priming and bilge line leakage detection drill bit order A/E performance parameters checks fuel duplex filter change over specific lube oil consumption COPT safety M/E specifications and which type MEP: Fuel injector overhaul FWG not maintaining vacuum Scavenge space inspection MAC trips How to order flange AE Unit no. 1 exhaust temp high Change over process of refer

Difference Between Purifier & Clarifier

Purifier Clarifier Remove water and suspended solids particles from oil Remove finer and lighter particles Two outlets-water & clean oil One outlet-clean oil Gravity disc on top No gravity disc only sealing ring Blind disc on the top of the disc stack Blind disk at the bottom Sealing water required Sealing water not required

Difference Between RTA to RT-flex engines

RTA RT-flex Developing fuel oil pressure One fuel pump per cylinder Fuel pumps on supply unit Storing of fuel oil Fuel rail Timing of injection Fuel cam on camshaft WECS-9520/ICU Developing pressure for exhaust valve activation One activating pump per cylinder Servo pumps on supply unit Storing of servo oil pressure Servo rail Timing of exhaust valve Valve cam on camshaft WECS-9520/VCU Fuel pump actuator Regulating power/speed Keeping fuel rail pressure Power/speed control Fuel pump Fuel quantity piston Timing of starting air Staring air distributor WECS-9520 Reversing Reversing of cam WECS-9520 Alarm & monitoring system External External Emergency control By mechanic shaft and cams acting on pneumatic valves of the engine contr


A thread is a groove that in the case of fasteners is typically of a vee form. Enlarging a section of a thread it can be observed as a series of ridges and hollows. Specific names are given to parts of the thread. The crest is the topmost section of the thread. The root is the bottom of the thread. The thread flanks lie between the roots and crest of the threads. The major diameter of a thread is, for an external thread, the diameter over the crests of the thread. For an internal thread it is the diameter over the thread roots. The pitch diameter cannot be directly measured since there is no marking or indication on the thread to measure. To explain the pitch diameter, it is first necessary to understand what the pitch is.   For inch threads, the pitch is defined as the number of threads per inch - or tpi. With metric threads the pitch is directly specified. The pitch diameter is the diameter on the thread that the space between the threads is equal to the space across the t