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Seamanship Techniques 2011 E Part 9 docx

Seamanship Techniques 2011 E Part 9 docx

Seamanship Techniques 2011 E Part 9 docx

... and DepthMultiple echoesThese are caused by the transmitted pulse being reflected several timesbetween the sea bed and the water surface before its energy is dispersed.Such multiple reflection ... samebarometric pressure.IsothermsThese are lines drawn on a weather map to connect areas of the sametemperature, and they may also be used to express the sea or airtemperatures.29Speed ... type of echo is a double reflection of the transmitted pulse. Itoccurs when the energy is reflected from the sea bed and then reflectedback from the surface of the water before being received by...
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Seamanship Techniques 2011 E Part 3 docx

Seamanship Techniques 2011 E Part 3 docx

... use as a greasecavity.Double and treble sheave purchase blocks are of a similar construction tothe single sheave, except that a partition plate separates the sheaves. Theyare used extensively ... RIGGINGSTEEL WIRE ROPEA steel wire rope is composed of three parts – wires, strands and theheart. The heart is made of natural fibre, though recently synthetic fibrehas been used when resistance ... The stopper should be examined for wear and tearbefore use, and if there is any sign of deterioration, the stopper should berenewed. The mariner should ensure that the stopper is secured, thenpass...
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Seamanship Techniques 2011 E Part 2 pps

Seamanship Techniques 2011 E Part 2 pps

... used to sleep in thefo’c’sle head area, and the banging cables tended to keep them awake.Hence they were lashed secure.The more up-to-date thinking is that if the cable is lashed the chanceof ... secured whenthe anchor is deployed.Deck plateDoublerUnderdeck framesHawse pipe (tubularsteel)Bolster (steel)‘D’‘D’ represents the diameter of thehawse pipe and is at least ninetimes the chain ... HOLDERSCable holders (Figure 2.16) are often fitted to large merchant vessels asan alternative to the windlass, and, with recent developments, may beseen on passenger vessels. They have also been popular...
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Seamanship Techniques 2011 E Part 4 pdf

Seamanship Techniques 2011 E Part 4 pdf

... be secured at the head of the sheer legs andthe weight taken. Care should be taken to ensure that men brace themselvesagainst any movement of the shoes in the process of raising the legswhen ... tubularsteel. Wooden derricks, which generally lifted only up to 3 tonnes, havelargely been superseded.At the heel of the derrick (Figure 5.1) either a single flange or adouble flange will be welded ... purchase secured atthe derrick head, the hauling part being led to the heel of the derrick.Allowing 10 per cent per sheave for friction, calculate the stress on thederrick head shackle securing...
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Seamanship Techniques 2011 E Part 6 ppt

Seamanship Techniques 2011 E Part 6 ppt

... Once the slip and bottle screware released, the gripe can be passed back over the boat and the endcleared. However, some gripes are interconnected to the trigger system,and the men in the boat ... weak link securing whichwill part after the painter becomes fully extended and the pressureincreases, causing the safe working load/breaking strain to be exceeded.‘D’ringServicereleaseDeck ... The tiller shall be permanently installed on orlinked to the rudder stock; however, if the lifeboat has a remotesteering mechanism, the tiller may be removable and securelystowed near the...
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Seamanship Techniques 2011 E Part 8 potx

Seamanship Techniques 2011 E Part 8 potx

... Checks thatrudder indicatorshows maximum porthelmEase the wheel to Ease the wheel to Allows the wheel to Wheel eased toport ten degrees port ten degrees, return towards the port ten degrees,sir ... What are the main differences between the construction ofa flexible steel wire rope and a non-flexible steel wirerope?Ans. A flexible wire will have more wires per strand and a fibreheart running ... ordering the helmsman to apply helm to change the ship’s course towhatever is stated.‘State when the vessel stops steering’, or when vessel no longer responds to helm movementbecause she has...
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Seamanship Techniques 2011 E Part 10 ppsx

Seamanship Techniques 2011 E Part 10 ppsx

... the vessel may be expectedto roll somewhat slowly and independently of the waves. The vessel willprobably experience only moderate angles of roll, and the waves may beexpected to break near ... between the two vessels shall notmake the overtaking vessel a crossing vessel within the meaning of theseRules or relieve her of the duty of keeping clear of the overtaken vesseluntil she is ... the operation.85MeteorologySevere wear of the outer shell plating will be experienced at thewaterline level, and for some height and depth above this level, accordingto the thickness of the...
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Seamanship Techniques 2011 E Part 11 pdf

Seamanship Techniques 2011 E Part 11 pdf

... Seamanship Techniques RedGreenVessel less than 50 m in lengthrestricted in her ability to manoeuvre.GreenRed, white, red,all-round lightsshown where theycan best be seen.RedRange 2 milesHead ... canGreenGreenConicalSparPillarRedGreenRedRedGreenPreferred channel to starboard, red with green stripe, andred light flashing 2 + 1 (group flashing).GreenRedGreenGreenRedPreferred ... system over the keel area, together withincreased scantlings where considered necessary for the trade. However,no company or shipbuilder can foresee the future and guard against theunexpected...
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Seamanship Techniques 2011 E Part 12 pps

Seamanship Techniques 2011 E Part 12 pps

... derricks been lowered or removed?(d) Where applicable, have portable pipes been removedand have the remaining open ends been blanked off? (e) Are rope messengers to hand for securing the helicopterif ... considerable time to secure. In an emergency it may even proveimpossible to secure against water pressure on one side.Regular and extensive maintenance is required on the clips to ensurethey are free ... the second lifebuoy is released when the vesselis on a reciprocal course, a reference line of search can beestablished between the first and second lifebuoys. This wouldbe of considerable help...
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Seamanship Techniques 2011 E Part 13 potx

Seamanship Techniques 2011 E Part 13 potx

... other, preventing the steering problemsexperienced by the single screw vessel (see Figure 9. 9).A distinct advantage of twin screws, apart from the increased speedcreated, is that if the steering ... SideThis term refers to that side of the vessel exposed to the wind. Seas maybe seen to break over the weather side as opposed to the lee side, whichis the sheltered, favoured side of the vessel.YawWind ... wateris not a solid medium and there is some ‘slip’ related to it.Slip may be considered as the difference between the speed of thevessel and the speed of the engine. It is always expressed...
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