Seamanship Techniques 2011 E Part 9 docx

... and Depth Multiple echoes These are caused by the transmitted pulse being reflected several times between the sea bed and the water surface before its energy is dispersed. Such multiple reflection ... same barometric pressure. Isotherms These are lines drawn on a weather map to connect areas of the same temperature, and they may also be used to express the sea or air temperatures. 29Speed ......

Ngày tải lên: 11/08/2014, 21:21

... use as a grease cavity. Double and treble sheave purchase blocks are of a similar construction to the single sheave, except that a partition plate separates the sheaves. They are used extensively ... RIGGING STEEL WIRE ROPE A steel wire rope is composed of three parts – wires, strands and the heart. The heart is made of natural fibre, though recently synthetic fibre has been used when resista...

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... used to sleep in the fo’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 chance of ... secured when the anchor is deployed. Deck plate Doubler Underdeck frames Hawse pipe (tubular steel) Bolster (steel) ‘D’ ‘D’ represents the diameter of the hawse pipe and is at least nine times th...

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... be secured at the head of the sheer legs and the weight taken. Care should be taken to ensure that men brace themselves against any movement of the shoes in the process of raising the legs when ... tubular steel. Wooden derricks, which generally lifted only up to 3 tonnes, have largely been superseded. At the heel of the derrick (Figure 5.1) either a single flange or a double flange will be w...

Ngày tải lên: 11/08/2014, 21:21

... Once the slip and bottle screw are released, the gripe can be passed back over the boat and the end cleared. However, some gripes are interconnected to the trigger system, and the men in the boat ... weak link securing which will part after the painter becomes fully extended and the pressure increases, causing the safe working load/breaking strain to be exceeded. ‘D’ ring Service release De...

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... Checks that rudder indicator shows maximum port helm Ease the wheel to Ease the wheel to Allows the wheel to Wheel eased to port ten degrees port ten degrees, return towards the port ten degrees, sir ... What are the main differences between the construction of a flexible steel wire rope and a non-flexible steel wire rope? Ans. A flexible wire will have more wires per strand and a fibre heart...

Ngày tải lên: 11/08/2014, 21:21

... the vessel may be expected to roll somewhat slowly and independently of the waves. The vessel will probably experience only moderate angles of roll, and the waves may be expected to break near ... between the two vessels shall not make the overtaking vessel a crossing vessel within the meaning of these Rules or relieve her of the duty of keeping clear of the overtaken vessel until she is ......

Ngày tải lên: 11/08/2014, 21:21

... Seamanship Techniques Red Green Vessel less than 50 m in length restricted in her ability to manoeuvre. Green Red, white, red, all-round lights shown where they can best be seen. Red Range 2 miles Head ... can Green Green Conical Spar Pillar Red Green Red Red Green Preferred channel to starboard, red with green stripe, and red light flashing 2 + 1 (group flashing). Green Red Green Green R...

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... derricks been lowered or removed? (d) Where applicable, have portable pipes been removed and have the remaining open ends been blanked off? (e) Are rope messengers to hand for securing the helicopter if ... considerable time to secure. In an emergency it may even prove impossible to secure against water pressure on one side. Regular and extensive maintenance is required on the clips to ensur...

Ngày tải lên: 11/08/2014, 21:21

... other, preventing the steering problems experienced by the single screw vessel (see Figure 9. 9). A distinct advantage of twin screws, apart from the increased speed created, is that if the steering ... Side This term refers to that side of the vessel exposed to the wind. Seas may be seen to break over the weather side as opposed to the lee side, which is the sheltered, favoured side of the...

Ngày tải lên: 11/08/2014, 21:21