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

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ABSTRACT Hatch covers are used to cover and protect the cargo in the cargo spaces. Hatch covers close off the hatch opening and makes it water tight. In the days of wooden ships, the hatch covers were made of wooden planks, beams and boards and were covered with tarpaulins. Wooden hatch covers had many drawbacks. Mainly, they used to get spoilt due to continuous exposure to the moisture laden sea winds. Rain and sea water also used to produce detrimental effects on the wooden hatch covers. But with the advent of steel, the wooden hatch covers started disappearing. Nowadays, mostly steel hatch covers are used. The most common type of hatch cover used today consists of a number of steel covers linked together. The design of a hatch cover changes according to the size and design of the ship, but most of the designs are made to make the opening and closing of the covers as quick as possible in order to facilitate faster cargo handling process. One such type of hatch cover is a MacGregor, single pull hatch cover. In this type, the hatch cover moves on rollers attached to tracks fixed on the hatch coaming. The hatch cover is not one steel structure but a series of steel covers linked together by chains. When the cover is opened, the individual steel covers ride up and tip onto a stowage tank at the hatch end. Most of the hatch covers found on board ships are controlled hydraulically by a hydraulic power unit operated from a control box fixed near the hatch cover. . iv
TABLE OF CONTENTS v Page no. CERTIFICATE ii ACKNOWLEDGEMENT iii ABSTRACT iv TABLE OF CONTENTS v LIST OF FIGURES ix LIST OF TABLES xii CHAPTER 1 - INTRODUCTION 1 1.1 Hatch Cover and Their Function. 2 1.2 Early Hatch Cover. 3 1.3 Failing of Wooden Hatches. 5 1.3.1 Safety and Security 5 1.3.2 Maintenance 6 1.3.3 Cargo Working 6 1.4 Steel Hatches After 1927 6 CHAPTER 2 - TYPES OF STEEL HATCH COVERS 9 2.1 Single Pull. 11 2.2 Side Rolling. 12 2.3 Folding and Multi Type 13 2.4 Lift Away 14 2.5 Piggy Back. 15 2.6 Stacking Covers 16 2.7 Reefers Hatch Covers. 17 2.8 Spring Loaded Covers. 18 CHAPTER 3 - GENERAL REQUIREMENT 19 3.1 Regulatory Requirements. 19 3.1.1 Rule Governing Access Equipment 19 3.1.2 International Load Line Convention, 1966. 19 3.1.3 Freeboard. 20 3.1.4 Freeboard Deck. 21 3.1.5 Weather-Tightness and Water-Tightness. 22
Page 1 and 2: SINGLE PULL MACGREGOR TYPE HATCH CO
Page 3: ACKNOWLEDGEMENT First of all we hel
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 and 34: secured by tarpaulins and battening
Page 35 and 36: force by the 1967 Merchant shipping
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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