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Maritime Forum

Topics in Category: Naval Architecture and Ship construction

emo
Views: 1232
Replies: 1
Topic List
anandgardener's Avatar
Topic started 13 Aug 2016 06:17 by anandgardener
Make a sketch of midship section of a car ferry and LNG Ship.
anandgardener's Avatar
Last Post by anandgardener 13 Aug 2016 06:35
[image] [image]
emo
Views: 277
Replies: 1
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anandgardener's Avatar
Topic started 03 Aug 2016 07:52 by anandgardener
Describe with the help of sketches about mechanical ventilation of Cargo hold and twin deck of a dry cargo vessel. Question was asked by Hassaan Khalid
anandgardener's Avatar
Last Post by anandgardener 05 Aug 2016 12:53
As per the rules the Cargo holds mechanical ventilation system should be able to do 6 to 10 air changes/Hour (depending on the provided grade of explosion protection required). In case of Roll-on/Roll-off vessels increased ventilation capacity of at least 20 air changes/hour is required during...
emo
anandgardener's Avatar
Topic started 30 Jul 2016 09:34 by anandgardener
What is the effect on stability of operation in ship derrick and carriage of bulk ore cargo?
anandgardener's Avatar
Last Post by anandgardener 30 Jul 2016 10:25
Effect of Ship's Derrick on Stability of the Ship The effect of Ship's derrick on the stability of the ship depends on the Size of the Ship's Derrick and the weight it lifts. Thus the extent of effect of Derrick operation on the Ship will vary on the Type of Ship and the cargo. Say it's a heavy...
emo
anandgardener's Avatar
Topic started 27 Jul 2016 15:48 by anandgardener
How margin line of a ship is calculated & What is sub-division load line? The question was asked by Hassaan.
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Last Post by anandgardener 27 Jul 2016 17:52
Margin line is something which is not calculated, but is an imaginary line and is used in making calculations regarding the flooding of hulls. It runs fore-and-aft 3 inches (8 cm) below the upper surface of the bulkhead deck at the side. Subdivision load line marks Sub-division load line are made...
emo
anandgardener's Avatar
Topic started 17 Jul 2016 14:39 by anandgardener
This Question I am putting on behalf of Hassan Khalid, who requested Answer to this question on WhatsApp. Q. Explain the meaning of Following terms with simple sketches and their purpose in the Structure of ship. * Devils Claw * Cable stopper * Hatch Coaming * Duct Keel * Collision Bulkhead
anandgardener's Avatar
Last Post by anandgardener 17 Jul 2016 15:04
1. Devil's Claw : It is a securing device used to secure the anchor cable, when the vessel is at sea. [image] It is in addition to the Anchor Chain stopper and the Band brake to fasten the Anchor chain in high seas, where sea may be...
emo
Views: 192
Replies: 1
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PMA-3777's Avatar
Topic started 03 Jul 2016 11:15 by PMA-3777
In carriage of dangerous cargoes in bulk how the danger of contamination or reaction of cargo is avoided and safety precautions which should be observed by ships personnel when working in or near hazardous areas?
anandgardener's Avatar
Last Post by anandgardener 05 Jul 2016 03:36
Procedure for Carrying of the Dangerous Cargo has to be complied and referred for as per the IMDG Code. The International Maritime Dangerous goods (IMDG) Code is published by the IMO and is designed to assist compliance with the general requirements of Chapter VII of the SOLAS. The Code contains...
emo
Views: 302
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 03 Jul 2016 11:12 by PMA-3777
Discuss the effect of following on stability of ships: 1. Light cargo 2. Liquid cargoes in Bulk 3. Deck cargoes 4. Normal consumption of fuel oil and water.
admini's Avatar
Last Post by admini 04 Jul 2016 02:41
Weight of the Cargo plays the most crucial role on Stability of the Ship, as it decides the position and magnitude of G and thus the value of GM,the Metacentric Height. (1) Light Cargo: If the Cargo is light, the position of the center of Gravity, G would be higher and thus the value of Metacentre...
emo
Views: 191
Replies: 1
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PMA-3777's Avatar
Topic started 02 Jul 2016 16:36 by PMA-3777
Explain how racking occurs in a ship.Sketch and describe the arrangement used to resist racking in ships with sloping margin plate on the DB tank and with horizontal margin plate on DB tank and in Ro-Ro ferries.
anandgardener's Avatar
Last Post by anandgardener 03 Jul 2016 06:50
WHAT IS RACKING When a ship is rolling, the deck tends to move laterally relative to the bottom structure, and the shell on one side to move vertically relative to the other side. This type of deformation is referred to as ‘racking’. HOW RACKING IS PREVENTED One thing to be remembered, is...
emo
Views: 287
Replies: 1
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Anonymous's Avatar
Topic started 02 Jul 2016 16:32 by Anonymous
WHY ARE SHIPS CLASSIFIED.GIVE A GENERAL ACCOUNT OF THE WORK REQUIRED FOR RECEIPT OF ORDER TO COMPLETION IN ORDER THAT A SHIP MAY BE CLASSIFIED BY ONE OF THE MAJOR CLASSIFICATION SOCIETIES.GIVE A TYPICAL CLASS NOTATION FOR A CARGO SHIP EXPLAINING THE MEANINGS OF SYMBOLS INVOLVED.
anandgardener's Avatar
Last Post by anandgardener 03 Jul 2016 02:56
The merchant ships are classed to get Insurance cover. A merchant ship is a very heavy capital investment (in today's date a New-built Handysize Bulk Carrier may be costing around U.S.$ 10-15 Million. This money the owners might have brought from a bank and then again she may be carrying a cargo...
emo
anandgardener's Avatar
Topic started 24 Jun 2016 10:04 by anandgardener
Describe the pumping arrangement for a double bottom tank. What methods are used to : 1.Ensure against air locks 2.Ensure complete drainage 3.Measure the content of tank
anandgardener's Avatar
Last Post by anandgardener 28 Jun 2016 03:43
The pumping arrangement for a double bottom tank is not much different from that in any other tanks, but following factors makes a difference and are considered while designing the pipe work: 1. The ship's are mostly down by stern 2. The bottom plate is in touch of sea-water from outer side and...
emo
Views: 310
Replies: 4
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anandgardener's Avatar
Topic started 24 Jun 2016 10:07 by anandgardener
Describe how the following is made watertight stating a suitable material or compound if required: 1.Riveted shell plate 2.Double bottom tank mannhole door 3.Sterntube against the aft peak bulkhead 4.Access to a cargo tank on a bulk oil carrying vessel.
anandgardener's Avatar
Last Post by anandgardener 27 Jun 2016 14:41
Most common type of design of access cover to cargo tanks of the Tankers are oil tight hatch with horizontal side swinging cover of flat top type,having ullage cover (for taking ullage), as shown in drawings below: HATCH COVER IN CLOSED POSITION...[image] HATCH COVER IN OPEN POSITION [image] DRAWING OF LATCH...
emo
Views: 211
Replies: 0
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anandgardener's Avatar
Topic started 24 Jun 2016 10:00 by anandgardener
Describe and indicate the significance of the following used in the transportation of dangerous substances in bulk 1.Threshold limit values 2.Cargo containment 3.Polymerization 4.Crew safety
emo
Views: 2529
Replies: 1
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anandgardener's Avatar
Topic started 12 Jan 2012 15:46 by anandgardener
(a) With reference to double plated hollow rudders: (i) State the merits of this type of rudder compared to the single plate rudder. (ii) State two methods of protecting the rudder from internal corrosion; iii) Describe how the ship and its performance would be affected by a cracked rudder plate...
class 1 exam candidate's Avatar
Last Post by class 1 exam candidate 09 Jun 2012 03:27
i) increase in buoyancy. reduced weight and load on the carrier bearing. double plate with stiffeners inside gives better strength to withstand forces. stiffeners inside the hollow rudder gives an outer smooth surface flow, reduce drag. due to the aerofoil shape of the rudder, it has a higher stall...
emo
Views: 329
Replies: 0
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anandgardener's Avatar
Topic started 12 Jan 2012 16:33 by anandgardener
Discuss the maintenance and tests required in the case of the following: - (a) Electric lifeboat or cargo winches. (b) Emergency generators. (c) Motor starters. (d) Electric warning devices
emo
Views: 363
Replies: 0
Topic List
anandgardener's Avatar
Topic started 12 Jan 2012 16:33 by anandgardener
A 230V, series motor driving a winch runs at 1000 rev/min when taking 12.5A from supply. The field winding resistance is 1.2A and the armature resistance 1.5. If a diverter resistance of 2.4 is connected across the field winding, at what speed will the motor run if the torque remains...
emo
Views: 436
Replies: 0
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anandgardener's Avatar
Topic started 12 Jan 2012 16:33 by anandgardener
Two 120V 15W metal filament lamps are arranged as earth detector lamps on a main switchboard which has a constant potential difference of 110V across its bus bars. As a result of damage to the insulation of the supply cables to an electric motor the resistances to earth of the positive and negative...
emo
Views: 376
Replies: 0
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anandgardener's Avatar
Topic started 12 Jan 2012 16:32 by anandgardener
A quantity of 0.1cm diameter wire is to be used for reloading fuse-holders. Calculate the normal steady current it may carry in order to allow a safe margin of 100 per cent overload if it is known to lose heat at the rate of 0.004 cal/sec/sq cm of surface for each Centigrade degree above the ambient...
emo
Views: 296
Replies: 0
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anandgardener's Avatar
Topic started 12 Jan 2012 16:32 by anandgardener
Show that the maximum efficiency of a transformer occurs when the I2R loss is equal to the core losses. A single phase transformer whose primary winding is connected to a 50 Hz supply has a secondary winding of 50 turns and given an induced voltage of 100 V on no-load. The iron section of the...
emo
Views: 357
Replies: 0
Topic List
anandgardener's Avatar
Topic started 12 Jan 2012 16:31 by anandgardener
Why a.c. generators are constructed with a stationary armature and revolving fields? What is the common frequency used in Indian flag vessel in India? Give the relation for frequency in a.c. generators. Find the number of armature conductors in series per phase required for the armature of a...
emo
Views: 300
Replies: 0
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anandgardener's Avatar
Topic started 12 Jan 2012 16:31 by anandgardener
How does the change in rotor-frequency affect the induction motor when the load is changed from no-load to full-load? The total input power to a 500 V, 50 Hz, 6-pole, 3-phase induction motor running at 975 rpm is 40 kw. The stator losses are 1 kw. Friction and windage losses are 2 kw total....
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