Feature 4 | DECK EQUIPMENT AND MACHINERY
The amendments to the CSS code will see further training in securing cargo.
efficiency where possible, which was started in 2006. Te project ended in January this year with the flag states that are involved in the project looking to have a further follow up of the findings presented to the IMO. Marin is set to present its findings at the DSC 15 meeting this month. Marin has carried out a monitoring
campaign of five ships in operation, model tests of secured cargo and an extensive survey asking crew for their input was conducted in the container, ro-ro and heavy-lift sectors. A consortium of 24 participants representing flag states, classification societies, ship owners and lashing equipment manufacturers, as well as crew from 160 vessels has taken part in the three year research project that was sponsored by the Dutch government. The main findings with respect to
container lashings on the big ships (smaller vessels such as feeders were not addressed in the study) were that high loads may develop when stack
COMLASH investigates
British-based TMC marine has recently updated its software COMLASH to include a buttress lashing system in the holds of several tweendeck vessels, with the additional feature to allow parallel lashing at the click of a button. COMLASH was originally written in 1979 with the view to allowing those onboard a container ship a quick and easy way to check the stack and lashing forces of all the container stacks loaded onboard. For any given set of conditions, ie. Roll angle, windforce, vessels metricentric height (GM), etc. and for all major classification society rules, COMLASH will, at the click of a button check each and every lashing, twistlock and container frame for any overloading. Combined with a BAPLIE file import facility the checking of the stack and lashing forces of several thousand containers loaded onboard a modern container ship can be done in the matter of minutes. The use of COMLASH also removes the uncertainty associated with checking tier weight distributions and mixes of container lengths and heights which arise when checking bay plan weights against a vessel cargo securing manual. COMLASH is also used extensively in container stow collapse investigations
and in subsequent litigation work. Having a lashing programme which, was developed originally in-house and which is maintained and updated in- house means that any situation, no matter how unique can be modeled in COMLASH by our engineers.
128
interaction can develop. Such interactions may occur as a consequence of excessive stack weights and “off” vertical weight distributions by non properly loaded containers (heavy over lights) or in
• Increase the reliability that the cargo is in fact loaded in agreement with how it is
• Increase the ability of the crew to avoid excessive vessel response in adverse
supposed to. Ie that the loading computer assumed loading actually reflects the situation onboard allowing a proper assessment of loads and limitations.
• Increase the reliability of the condition of lashing gear, containers themselves and
weather.
deck fittings. Te amendments in the MSC circular that
came out earlier this month to the CSS code will mainly affect ships that are constructed after 1st January 2015, which looks closer at how containers are secured and placed onboard a vessel; whilst in the mean time the use of lashing and the types of lashings used in regards of training crew will need to be addressed. Research is still being carried out to make container stowage safer for both crew and vessel through industry research projects such as Lashings@Sea. NA
The Naval Architect September 2010
combination with loosening lashings. If such effects can occur than combination with high environmental loads by weather and possibly in combination with extreme GM (high GM) may result in loads that may progressively collapse adjacent rows. Marin believes that in order to improving safety attention must be paid to:
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148 |
Page 149 |
Page 150 |
Page 151 |
Page 152 |
Page 153 |
Page 154 |
Page 155 |
Page 156 |
Page 157 |
Page 158 |
Page 159 |
Page 160 |
Page 161 |
Page 162 |
Page 163 |
Page 164