Question and Answers

    Question
    marinetales June 16, 2021
    MEDITERRANEAN MOOR - A ship’s mooring which allows the vessel to be secured to the quay by stern moorings while the bow is held fixed by deploying both bow anchors. The mooring is suitable for non-tidal waters, like the Mediterranean Sea.
    marinetales June 16, 2021
    BALTIC MOOR A combination mooring of a vessel alongside the berth which employs a stern mooring shackled to the offshore anchor cable in the region of the ‘ganger length’. When approaching the berth, the offshore anchor is deployed and the weight on the cable and the stern mooring act to hold the vessel just off the quay.
    marinetales May 23, 2021
    Following procedures for carrying out pressure testing of fire hoses - 1. Lay down all fire hoses 2. Connect one fire hose to fire hydrant 3. Connect other hoses end-to-end to this hose so as to form a single system 4. Connect a nozzle to the open end 5. Ensure connections are tight 6. Secure the hoses and ensure that they do not run when fire pump is operating 7. When all checks are done start the fire pump and increase discharge pressure up to designated value (usually 6 bar) 8. Start inspecting closely each fire hose for any leakage 9. Give special attention to coupling areas and seized areas
    marinetales May 17, 2021
    Both DG Good container and Reefer Container CAN be stowed in the same hold, PROVIDED segregation and stowage is done in accordance with the IMDG Code.
    marinetales May 17, 2021
    There are three types of Twistlocks: 1. Manual twistlock 2. Semi - automatic twistlock 3. Fully - automatic twistlock
    marinetales May 18, 2021
    Marine pollutants or environmentally hazardous substances are materials that can pose a risk to aquatic ecosystems. Marine pollutant is a term mainly used by IMDG code.
    marinetales May 17, 2021
    The Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships, 2009 (the Hong Kong Convention), was adopted at a diplomatic conference held in Hong Kong, China, from 11 to 15 May 2009, which was attended by delegates from 63 countries. The Convention is aimed at ensuring that ships, when being recycled after reaching the end of their operational lives, do not pose any unnecessary risks to human health, safety and to the environment. The Hong Kong Convention intends to address all the issues around ship recycling, including the fact that ships sold for scrapping may contain environmentally hazardous substances such as asbestos, heavy metals, hydrocarbons, ozone-depleting substances and others. It also addresses concerns raised about the working and environmental conditions at many of the world's ship recycling locations.
    marinetales May 18, 2021
    Permissible load density: Permissible load density is the amount of weight that can be safely loaded per unit volume of Cargo Hold / Deck. A point load is a load applied to a single, specific point on a structural member. It is also known as a concentrated load, and an example of it would be a hammer hitting a single nail into a beam. On ship, it could be an eye pad welded on the main deck which can be used for lashing. Values of above can be obtained from Cargo Securing Manual.
    marinetales May 17, 2021
    The mandatory marking on ship's hull include - 1. Ship's Name 2. IMO Number 3. Port of Registry 4. Plimsoll Mark 5. Draft Marks 6. Other markings such as marking of compartments, fuel oil tanks, tug position and pilot ladder.
    marinetales May 19, 2021
    Usually, an average Windlass is designed for picking up a weight of 3-4 shackles + Anchor weight. Beyond that, it is quite impossible for the windlass to heave. Looking at the present situation there is a possibility that the anchor is holding the ground through ONLY the flukes. There are three possibilities to it - 1. The flukes might be stuck on to an obstruction, check chart and local navigation warnings and information to rule out this possibility ; or 2. Try to couple the power of both windlass by rigging the mooring rope from one windlass to another; OR 3. Let go the anchor from the bitter end. Attach the buoy to it and mark the position, inform the authorities and nearby ships.
    marinetales May 19, 2021
    Good time means ‘early’. There is no specific time at which good time begins. It’ll depend on a particular situation. Manoeuvres taken to avoid a close-quarters situation should be taken at a time when the responsible officer does not have to make a quick decision or a decision based on inadequate information. We can say that if a vessel fails to take action in good time, she may find herself in a close-quarters situation. This paragraph does not say that action is to be taken in good time to avoid a collision.
    marinetales May 18, 2021
    Suction pressure depends upon the tank level. When tanks level are high , suction pressure is high and vice versa. The height of cargo divided by 10 shall be your approx suction pressure. Sometimes when you prepare for cargo discharging and fill separators, you get less suction pressure because of vapour lock in cargo pump separators. The solution is simple. 1. Open discharge valve of pump. 2. Open line master on deck. 3. Open goose neck. 4. Now open bulkead masters. 5. Open tank valve upto 10%. Let the separators fill properly. Any vapour will escape through cargo discharge line to goose neck into the tank. Let's take an example of VLCC. When tank ullage reaches 20-22 mtrs ( max 28 mtrs ) , suction pressure normally comes close to 0, that means the amount of cargo required to discharge at same pressure is equal to the amount of available cargo at suction side. Now in VLCC, the cargo line going inside the tank is approximate 2 mtrs above tank top. This additional creates a negative suction pressure of about 0.2 kg / cm2. That means while discharging you can safely upto -0.2 kg / cm2 suction pressure. When suction pressure goes below this level, that is the time to reduce pump rpm to maintain suction pressure in between 0 - -0.2 kg/cm2 Discharge pressure. Discharge pressure depends upon various factors. 1. Shore pipe line length 2. Shore pipe line diameter 3. Shore tank height 4. Shore tank level. 5. Suction pressure at vessel end. 6. Pump RPM Discharge pressure is maintained as per charter party requirements or as per company SMS. The pressure is always given at ship's manifold. Eg. My vessel can discharge cargo with a maximum manifold pressure of 10.0 kg/cm2.When you are discharging and tank levels get low, the first indication that tanks are not getting enough oil is fluctuating discharging pressure. As soon as discharging pressure fluctuates, pump RPM can be reduced, if required further, pump discharge valve can be throttled. How to use the pressure to take tanks to stripping level. 1. As soon as discharging pressure fluctuates, reduce pump RPM 2. Keep reducing RPM as required. 3. When pumps are at minimum RPM and discharge pressure is fluctuating, start throttling pump discharge valves. 4. If required, stop 1 pump out of 3 or further 2 pumps out of 3 aa required. This depends upon vessel to vessel and line groups
    marinetales May 18, 2021
    It was done to avoid confusion with reference to Fire Classes A, B, C.
    marinetales May 17, 2021
    No, the effectiveness of the rudder depends upon the rate of water flowing past it. During drifting since no such water flow is there, the effect of the Rudder becomes Null.
    marinetales May 14, 2021
    Centrifugal pumps are used as ballast/fire pumps. The main reasons are: 1. centrifugal pumps are usually specified for higher flows and for pumping lower viscosity liquids 2. less frictional losses 3. minimum wear
    marinetales May 14, 2021
    When the Life Raft inflates the excess pressure is released from the Pressure Relief Valve. Also during the high ambient temperature the excess pressure is released from the Pressure Relief Valve. Stabilizing pockets are small pockets attached at the underside of the life raft. They fill with water and prevent the life raft from capsizing. They provide stabilization to the life raft. Pic attached below.
    marinetales April 15, 2021
    For differentiating between dew and mist letus first understand fog. Fog can be described as a cloud forming very close to or at ground level. It requires air with sufficient moisture to cool or to be cooled to a temperature to achieve condensation. Once condensation occurs, visibility decreases dramatically. It therefore becomes very hazardous. Fog does not necessarily have to be uniform, or widespread. Some areas may have thick fog whilst others may miss out completely. Fog is more common in valleys and near creeks or streams. It also most commonly occurs overnight and during the morning. However, in colder climates where fog is more common, it may last all day. Mist is similar to fog except it may appear more ragged and forms on rainy days with the air saturated due to the amount of moisture. Mist is more common in mountainous and forest regions. Dew is moisture that condenses at the ground level. The layer of air within about a metre above the ground experiences rapid changes in temperature from day to night. Therefore the temperature may be cooler on the ground than the air above. Consequently, the air temperature close to the ground may cool to below the level needed for condensation. Moisture therefore is observed on grass and on the surface of some objects such as those with metal surfaces. If the air above also cools below the condensation level, fog will form.
    marinetales May 17, 2021
    There are many turn which can be executed. Each turn has its own advantages and disadvantages. For example Williamson’s turn is very advantageous in reduced visibility BUT Anderson turn is the fastest recovery method. On the other hand Scharnov turn reduces overall times as the distance covered is the least. Hence, any turn which is executed, will depend upon the state of Sea, visibility and location of the MOB ( whether known or not). However, in most of the circumstances Williamson’s turn is preferred.
    marinetales May 14, 2021
    The Schedule A of the NP133C shows which ENC's are licensed for use by the vessel and which base CD's or DVD Volumes are required to install them.
    marinetales May 14, 2021
    Following information is mostly submitted to the port prior arrival: 1. Crew list 2. Crew effect declaration 3. Bond and store declaration 4. Maritime declaration of health 5. Cargo manifest / declaration 6. Custom forms
    marinetales May 14, 2021
    When the density of the water changes the underwater volume of the vessel changes. As a result of change in the underwater volume, the draft of the vessel changes.
    marinetales May 14, 2021
    Stopping distance is the distance covered by a ship (which is making headway), after the engines are stopped. Stopping distance are of two types : 1. Inertia Stop 2. Crash Stop 1. Inertia Stop: when the engine of the ship is stopped, the ship will continue moving in the same direction for some more distance due to inertia. Here no astern command is given (used to produce “braking effect” for ships), and hence ship will travel more distance in the inertia stop method. 2. Crash Stop: Here the engine, which is moving in an ahead direction is given an order for full astern, leaving the rudder in the mid ship position to stop the ship within minimum distance and shortest possible time.