Single pull macgregor type hatch cover.pdf - Cochin University of ...

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freeboard deck. When a lower deck is designated the freeboard deck, the part of hull which extend above the freeboard deck is treated as superstructure so far as concerns the application of the conditions of the assignment and the calculation of freeboard. It is from this deck that the freeboard is calculated. It should be noted that the requirement for a lower deck to complete and permanent in order to be designated the freeboard deck, does not mean that any openings need to be weather tight, only that the structure of a deck is present. Tween- deck hatches may be of steel or wood, but are only required to be watertight if fitted to deep tanks or compartments containing water ballast. The ‘Administrations’ referred to include the Department of Trade in the United Kingdom, the us coast guard in the united states and equivalent in other countries. 3.1.5 Weather-Tightness and Water-Tightness Regulation of the 1966 LLC which covers the mean for securing weather-tightness of steel weather-tight covers states that ‘The means for securing and maintaining weather-tightness shall be to the satisfaction of the Administration. The arrangement shall ensure that the tightness can be maintained ain any sea conditions, and for this purpose test for tightness shall be required at initial survey ,and may be required at periodical survey and at annual inspections or at more frequent intervals. Regulation defines ‘weather-tight’ as meaning that water will not penetrate into the ship in any conditions. ‘Weather-tight’ is not defined into 1996 LLC but is generally regarded as higher standard than weather-tight.it is usually taken to require the closure to be capable of preventing the passage of water through the structure in any direction, under the head of ships margin line, which is line drawn at least 76 mm in below the upper surface of bulkhead deck at the side of ship. In practice the hatch covers of B-60 and B-100 ships must be of steel and made weather-tight by means of special gasket devices. Less commonly, hatch may be made weather-tight by means of tarpaulins and battening devices over wooden or portable steel pontoon covers. 3.1.6 Statutory Regulations The 1966 load line convention came into force in 1968 after it had been ratified by required number of maritime nations. In UK the convention was brought into the 22
force by the 1967 Merchant shipping Act from which the merchant shipping (load line) rules 1968 were made the rules for the constructions of ship laid down by Lloyds register of shipping are consistent with the convention, as are those of other C classification societies. 3.2 GENERAL CONSIDERATIONS FOR ACCESS EQUIPMENT 3.2.1 Coaming height Minimum coaming height, derived from the 1966 LLC, is laid down by Classification Societies. Height are measured above the upper surface of the deck, and any sheathing that may be fitted, and for hatchway closed by portable covers secured water tight by tarpaulins and battening devices, they must not be less than: 600 mm (23.5 in) for Position 1; 450 mm (17.5 in) for Position 2, Coaming of hatchways closed by steel covers fitted with direct securing arrangements are usually as indicated above, taking into account any sheer or camber when assessing minimum height. They may, however, be lower, or even omitted entirely, if the safety of the ship is not impaired by doing so, provided the Administration of the country concerned consents. The scantling and securing arrangements of flush hatch covers or those having less than standard height coamings are treated as special cases. Such arrangements have been approved in the past. Dock safety regulations generally require a minimum coaming height of about 760 mm (2 ft 6 in), otherwise additional fencing must be fitted to prevent personnel falling through the hatchway. It is rare for ship to have coamings of lower height than those stipulated, unless they are completely flush. Flush weather decks are required in a variety of circumstances. For instance, vehicles, wheeled cargo, or containers must sometime be stowed over the full deck area including the hatch covers, and clear decks for recreation are desirable in passenger ships. Satisfying the flood ability requirement for B-100 and B-60 ships may result in coaming being increased in height on such ships to meet loadline and subdivision regulation. 23
Page 1 and 2: SINGLE PULL MACGREGOR TYPE HATCH CO
Page 3 and 4: ACKNOWLEDGEMENT First of all we hel
Page 5 and 6: TABLE OF CONTENTS v Page no. CERTIF
Page 7 and 8: 5.1.4 Hatch Covers Design. 58 5.1.5
Page 9 and 10: LIST OF FIGURES Figure no: Title Pa
Page 11 and 12: Figure7.10 Bulwark 84 Figure7.11 Bu
Page 13 and 14: CHAPTER 1 - INTRODUCTION The classi
Page 15 and 16: leakage can cause cargo damage and,
Page 17 and 18: All types of wooden hatch were made
Page 19 and 20: The first horizontal rolling built
Page 21 and 22: CHAPTER 2 - TYPES OF HATCH COVERS M
Page 23 and 24: 2.1 SINGLE PULL 2.1.1 Description F
Page 25 and 26: 2.3 FOLDING & MULTI-TYPE 2.3.1 Desc
Page 27 and 28: 2.5 PIGGY BACK 2.5.1 Description Fi
Page 29 and 30: 2.7 REEFERS HATCH COVERS Figure 2.7
Page 31 and 32: CHAPTER 3 - GENERAL REQUIREMENTS 3.
Page 33: secured by tarpaulins and battening
Page 37 and 38: 3.2.2 Cover Stowage Where a designe
Page 39 and 40: It is also necessary to provide dra
Page 41 and 42: Other steel hatch cover secured wea
Page 43 and 44: Table 3.4 Access equipment strength
Page 45 and 46: Longitudinal deformation of the top
Page 47 and 48: (vii) It should retain all the abov
Page 49 and 50: easier to handle without power assi
Page 51 and 52: � Keep wheels, cleats, hinge pins
Page 53 and 54: 4.2.2 Drive Chains; Check their Len
Page 55 and 56: Figure 4.2 Vessel in rough weather
Page 57 and 58: Figure 4.5 Never smoke in a hold. S
Page 59 and 60: Figure 4.9 Always wear protective h
Page 61 and 62: e taken when opening hatch covers e
Page 63 and 64: Remember to carry out a chalk test
Page 65 and 66: 4.6.13 Painting Corrosion occurs ma
Page 67 and 68: 11. Coaming. 12. Sheave. 13. Cross
Page 69 and 70: Breadth: 44.5cm 5.1.3 Hatch Coaming
Page 71 and 72: Slope: 1cm Total number of panels:
Page 73 and 74: Height of jack while normal conditi
Page 75 and 76: Pulley for rope Diameter: 2cm Width
Page 77 and 78: Height from the deck: 7.2cm Height
Page 79 and 80: CHAPTER 6 - FABRICATION The design
Page 81 and 82: 6.3 HATCH COAMING FABRICATION Broug
Page 83 and 84: Using wood cutter length of 320 cm
Page 85 and 86:
Plastic wheels (16 pieces), metalli
Page 87 and 88:
At the top of the iron plate, rail
Page 89 and 90:
Figure 6.12: Crane space Source: Te
Page 91 and 92:
CHAPTER 7-ASSEMBLY OF FABRICATED PA
Page 93 and 94:
Source: Team 7.3 ASSEMBLY OF SIDE D
Page 95 and 96:
7.6 ASSEMBLY OF HATCH COVER All the
Page 97 and 98:
The whole bulwark is placed over th
Page 99 and 100:
Through the middle top eye bolt rop
Page 101 and 102:
The test involves placing (with hat
Page 103 and 104:
CHAPTER 9 - CONCLUSION Right from t
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