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RISK ASSESSMENT AND MANAGEMENT ONBOARD SHIP

    Most Frequently Asked Questions on Fresh Water  Generator (1)   Explain the Freshwater generator working principle. Ans:- The basic principle of all low-pressure freshwater generators is that the boiling point of water can be reduced by reducing the pressure of the atmosphere surrounding it. By maintaining a low pressure, water can be boiled at low temperatures say 50 degrees Celsius. The source of heat for the freshwater generator could be waste heat rejected by main engine jacket cooling water. (2) How to Minimize Scale Formation in Shell & Tube type Fresh water generator? Ans;- Scale formation in the freshwater generator can be controlled and minimized by continuous chemical treatment. Polysulphate compounds (like sodium polysulphate) with anti-foam are preferred by marine engineers and are extensively used on ships. Their trade name is different, like:   Vaptreat (by MONITOR) Ameroyal (by DREW CHEMICALS) These chemicals minimize c...

    Important Questions and Answers Asked  on Air compressor 1. What are the uses of compressed air on board ship? Ans;- a. To start the main propulsion engine b.To start Aux engine c.For Automation & Instrumentation of various types of machinery d.For Fire alarms e.For the operation of quick closing valves For the operation of pneumatic tools. For conducting aerobic breakdowns of the onboard sewage in a sewage plant. For pressure testing of different machinery parts, pipeline, etc For engine room general service For Deck general service For ships whistle For soot blowing of exhaust gas economizer For fresh & seawater hydrophores It is used in the lifeboat for heaving up the later if the air the motor is attached as a heaving provision.   2)Name the safety devices associated with 2 stages reciprocating air compressor. Ans:- Relief valve: Bursting disc on Intercooler (Waterside) Bursting disc & Fusible plug on aftercooler Mo...

Dry Docking:   Methods of dry docking of ships.  Inspection and routine overhauling of underwater fittings and hull.  Measurement of clearances and drops.  Removal and fitting of propellers (with and without Key). Part – A                       (Short Questions) 1. What is a Dry Dock? Ans;- The dry dock is a structured area wherein construction, repairs, and maintenance of merchant vessels and boats are carried out. The unique construction allows the water to be filled up in that area, also known as a lock so that vessels can be maneuvered in and out of the area. Once the vessel enters the dry dock, the gates are closed and the seawater is drained out so that the hull and other areas of the ship which have been exposed to seawater for a long time are available for carrying out maintenance and repair works. 2.  Whatis the Solas requirement for vessels to Dry Dock? Ans;- As per...