MEOclassIIexamnotes

 Percentage of a space than can be filled with water when flooding occurs How much empty space is inside a compartment                          Permeability =Vol of space available for water /  Total vol of space Used in calculation of damage stability Helps to estimate how much water will enter when a compartment floods Affects draft , trim and stability after damage

 Less density cargo Smaller watertight opening on freeboard deck Greater subdivision in longitudinal and transverse direction Permeability is less Large meta centric height Better pummping arrangment

 Less density cargo Smaller water tight opening on freeboard deck Greater subdivision in longitudinal and transverse direction Permeability is less Large metacentric height Better pumping arrangment

  Anti-fouling purpose  Red area is coated with anti-fouling paint Prevents marine growth (barnacles, algae, mollusks. Reduces drag, fuel consumption, and maintenance Copper-based paint Traditional anti-fouling paints contain copper compounds (cuprous oxide). Copper gives the paint a red / reddish-brown color Copper ions are toxic to marine organisms, preventing growth Reduced fuel consumption Clean hull improves fuel efficiency by up to 10–15% Less fouling = smoother hull = lower water resistance Corrosion protection Acts as a protective barrier Reduces direct contact between steel hull and seawater Slows down corrosion Industry standard (not mandatory) Red color is widely recognized Cost-effective and proven over decades Other colors (blue, black, green) are also used today Easy inspection during dry dock Strong contrast makes it easier to spot: Damage Wear Fouling patterns

For engine seating a plate floor is required every frame  Main engine seatings are in general integral with this double bottom structure.  Inner bottom in way of the engine foundation has a substantially increased thickness.  Often the machinery is built up on seatings forming longitudinal bearers which are supported transversely by tripping brackets in line with the double bottom floors, the longitudinal bearers being in line with the double bottom side girders.  There are transverse plate floors at each frame. The thickness of the engine seating is governed by the power, weight, and length of the unit

Both Leak & Structural test  Test head :  The greater of –  Top of the overflow To 2.4m above top of tank   To bulkhead deck    Procedure: Fill tanks by gravity to sea level. A ballast pump can be used if the vessel wishes, but is not recommended. If there are scuppers, then block scuppers as would be required for bunkering operations.  Close sounding pipes tightly if these are at deck level.  Open, or take off, air vent tops.  Top up tank through air vents by fire hose until (assuming stern trim) water level is close to top of aft air vents.  Ensure that fire hose can be stopped quickly as water level nears top of air vent.  Check by sounding or ullage through the air vent, that water level in forward air vents has also risen towards top of air vents. Hold level for 30 minutes minimum and check if level in vent is falling or steady.  Look for leaks.

 Used to determine things such as  Ship's manning regulations  Safety rules, o registration fees Insurance premium . Port dues Canal- and pilotage charges  Fleet- and traffic statistics  Technical equipment

 Pintle  For a ship in service, Maximum allowable clearances between Pintle and bush is 6 mm.   IF the actual clearance exceeds 6mm, the bush should be renewed.  Measured using the thickness gauge. The clearance is taken in four sides: forward, aft, port, and starboard.  The measurements are taken through the inspection cover, usually on the port side.  The normal clearance is about 1 to 2 mm.   Neck bush clearance Between the rudder stock and the neck bush (rudder stock upper side) is measured using the thickness gauge.  The clearance is taken in four sides: forward, aft, port, and starboard.  The measurements are taken from top of the rudder.  The normal clearance is about 1 to 2 mm.  Jumping Clearance: The designed clearance is 2.0 mm maximum.  If the clearance measured is found to be large, it can be concluded that the rudder has moved down. The clearances can be taken from rudder trunk – between the stopper and...

Hull Roughness Analyser  Computer is connected to the hand held carriage having a stylus measuring head.  Stylus head is moved around the hull surface to measure and record the hull roughness profile.  One traverse of the head at any point on the hull will collect information from 10 samples having length of 50 mm.  For each 50 mm sample, the micro processor will assess the mean gradient through the peaks and valleys to give highest peak to lowest valley measurement for that sample.  This measurement is known as Rt (50).  Approx. 100 selected locations which must include bow, stern, mid ship, and boot topping area (area between load line and ballast water line).  A number of traverses for stylus will give ‘n’ readings, hence the Mean Hull Roughness (M.H.R) at that station is average of Rt (50)  There will be ‘m’ stations around the hull of the ship. Hence Average Hull Roughness (AHR) will be average of Mean Hull Roughnes

Dept of rudder / width of the rudder. High aspect ratio is used in large vessels where depth is not a constraint.  Higher aspect ration reduces the astern torque considerably

Rudder stock is carried in the rudder trunk which as a rule is not made water tight at lower end , but water tight gland at top of the trunk ;ie, where the stock enters the intact hull. Trunk kept short so that the stock has minimum unsupported length.  Watertight opening for inspection

 A 0.5 mm diameter piano wire is stretched along each side of the bedplate. The wire is loaded with 40 KPa horizontal force. At the centre line of each cross girder , the distance is measured between the wire and the machined faces of the bedplate top outside oil grooves It will thus be revealed whether the later has changed compared with values during engine installation. The measurement are taken by micrometer with laser light when touches wire.

Chlorine content on effluent STP is operational or not Corrosion or hole on the tank holding to tank Aeration blower working and checking the pressure Overboard valve locked and sealed. Seal number recorded on logbook Validity of international sewage pollution prevention certificate Proper air lift from settling tank to aeration chambers Working of high level alarms and auto cut off Presence of Chlorine tablets or UV lamp 

Propeller blade system is designed for maximum efficiency in ahead direction In astern direction angle of attack is high on the back of the blade. Propeller will absorb very little available power. Severe eddying occurs on face(efficiency is low) Hence if 80% of Full ahead power is available for astern then boosting it to 100% will have minimal return in thrust

Parallel Keys : These keys have a rectangular cross-section and are used in straight keyways. They provide a simple and effective means of transferring torque between the shaft and the hub. Sunk Keys : Also known as rectangular keys, these keys fit into keyways that are cut into both the shaft and the hub. They have tapered sides that fit tightly into the keyway, preventing movement. Woodruff Keys :These keys have a semi-circular shape and are often used in applications where axial movement of the propeller on the shaft needs to be prevented. They fit into a curved keyway on the shaft and a corresponding slot on the hub. Tapered Keys :Tapered keys are used in tapered keyways, providing a wedging action that helps secure the propeller onto the shaft tightly. Gib Head Keys :Also known as feather keys, these keys have a projection, or gib head, that fits into a slot in the hub, preventing axial movement. The type of key used depends on factors such as the design of the propeller hub and s...

Should not be of cast iron Must be Class approved Fitted at easily accessible location as far as practicable readily visible Indicators are to provided local to the valve ie ,showing whether they are open or shut Valve spindle are to extend above the lower platform. Valves and distance pieces extended for the installation on the ship side below the load water line are to be tested by hydraulic pressure not less than 5 bar.

Hopper tanks are classified into bottom hoppers and top heavy wing tanks. For bottom hoppers, the main purpose is to take ballast, so as to rapidly increase the vessel immersion, simultaneous reduction in metacentric height, and a change in Centre of gravity. For top heavy wing tanks, the idea is to rapidly correct list of the vessel and act as active ballast tanks, for vessels such as Lakers where passages are narrow and cargo loading is often scattered. Except for this, they contribute in cargo loading also because the side slopes allow the cargo to slide off and collect at the centre, thereby making the cargo collection easier at the end Also, the hoppers are strengthened by additional transverse and longitudinal members, thereby supporting the port and starboard fuel tanks, and also distributing the cargo loading in a dynamic way to make sure the load is not concentrated at one point for higher loading speeds

  W - Manufacturer stamp/symbole + - fill 10% excess on psi ✬ - 10 years testing, if no ✬ then every 5years hydrostatic test. 2005/03 - year/month of manufacture 6831611 - serial number pw200 - cylinder pressure 5L- cylinder capacity Stamp for testing lab 

The possibility of fire aboard the ship or elsewhere within the dockyard complex is always unwelcome, but the fact remains it is a possibility at virtually any time of day or night. In the event that the possibility becomes reality, common sense and past training should automatically come into the equation.  As with any other fire incident the alarm should be raised as soon as possible after the discovery of the fire and the following procedure is suggested. Assuming that the crew have remained on board and the fire is on board the vessel, after the alarm has been raised:  Muster an emergency fire party and attempt to contain and extinguish the fire immediately following its discovery. Non-essential personnel should be evacuated to the shore and the fire brigade should be contacted. A gangway watch should be set to ensure that the access to the vessel is not blocked which as such would deny accessibility to fire fighters. The minimum water volume should be used when tackling f...