Моя статья в сборнике "Судовождение" №20, 2011.
Tuesday, 28 February 2012
Разработка процедуры отображения укладки генерального груза в трюмах судна
Приведено описание процедуры, позволяющей формировать трехмерное изображение укладки груза в трюмах судна.
Моя статья в сборнике "Судовождение" №20, 2011.
Моя статья в сборнике "Судовождение" №20, 2011.
Мітки:
Научные статьи
Friday, 17 February 2012
Ingress volumes - how much water flows into a damaged compartment
SOLAS CH II-1 Regulation 19 requires that each ship to be provided with the damage control information. Very often it is a thin file with the general arrangement plan showing boundaries of the watertight compartments with the openings and their means of closure, position of controls thereof, arrangements for the correction of any list due to flooding; watertight doors arrangement, general and specific precautions considered by the Administration to be vital to the survival of the ship, passengers and crew (i.e., closures, security of cargo, sounding of alarms, etc.).
Frankly speaking, on some ships I found it of just an illustrative use.
The same regulation says:
What about taking decisions? when there is no time? Best of all when you have the knowledge a priori. For instance, when you have the idea of how much time is left to flood the compartment. In order to know that, we need to know how much water floods in.
Ok, imagine the situation: Ship is flooding and you, calculator in your hand, are look through your books searching for a formulae.
Or otherwise: You have a breach of 2m2 below the waterline and still hope to pump it out with the bilge pump.
In such cases having an evaluation before any similar emergency breaks out is much better.
The table below shows the estimated volumes of water ingress (m3/h) into a damaged compartment.
To estimate the time left to flood the compartment, divide the volume of the compartment by the figure taken from the table, then multiple it by the permeability factor (roughly 0.85 for E/R and 0.90 for cargo spaces).
A.O. Chepok
This text is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
Frankly speaking, on some ships I found it of just an illustrative use.
The same regulation says:
In case of ships to which damage stability requirements of part B-l apply, damage stability information shall provide the master with a simple and easily understandable way of assessing the ship's survivability in all damage cases involving a compartment or group of compartments.
"simple and easily understandable way" - unfortunately I have never seen such even on the big brand-new ships.
"simple and easily understandable way" - unfortunately I have never seen such even on the big brand-new ships.
What about taking decisions? when there is no time? Best of all when you have the knowledge a priori. For instance, when you have the idea of how much time is left to flood the compartment. In order to know that, we need to know how much water floods in.
Source: National Geographic |
Ok, imagine the situation: Ship is flooding and you, calculator in your hand, are look through your books searching for a formulae.
Or otherwise: You have a breach of 2m2 below the waterline and still hope to pump it out with the bilge pump.
In such cases having an evaluation before any similar emergency breaks out is much better.
The table below shows the estimated volumes of water ingress (m3/h) into a damaged compartment.
WATER HEAD (metres below WL), m | AREA OF THE BREACH, m2 | |||||||||
SMALL | AVERAGE | LARGE | ||||||||
0,01 | 0,05 | 0,10 | 0,15 | 0,20 | 0,50 | 0,75 | 1,00 | 1,50 | 2,00 | |
1 | 104 | 518 | 1037 | 1555 | 2074 | 5180 | 7780 | 10370 | 15550 | 20740 |
2 | 147 | 726 | 1470 | 2200 | 2940 | 7260 | 11000 | 14700 | 22000 | 29400 |
3 | 180 | 898 | 1795 | 2695 | 3590 | 8980 | 13550 | 17950 | 26950 | 35900 |
4 | 208 | 1037 | 2075 | 3110 | 4150 | 10370 | 16550 | 20750 | 31100 | 41500 |
5 | 232 | 1160 | 2325 | 4650 | 5260 | 11600 | 17400 | 23250 | 34850 | 46500 |
6 | 254 | 1265 | 2540 | 3820 | 5080 | 12650 | 19100 | 25400 | 38400 | 50800 |
7 | 275 | 1370 | 2750 | 4130 | 5500 | 13700 | 20650 | 27500 | 41300 | 55000 |
8 | 294 | 1460 | 2940 | 4410 | 5870 | 14600 | 22000 | 29400 | 44100 | 58700 |
9 | 311 | 1555 | 3110 | 4670 | 6220 | 15550 | 23350 | 31100 | 46700 | 6220 |
10 | 318 | 1590 | 3180 | 4770 | 6360 | 15900 | 23850 | 31800 | 47700 | 63600 |
To estimate the time left to flood the compartment, divide the volume of the compartment by the figure taken from the table, then multiple it by the permeability factor (roughly 0.85 for E/R and 0.90 for cargo spaces).
A.O. Chepok
This text is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
Мітки:
Calc
Tuesday, 14 February 2012
Container service KPI's - Reliability
One of the most important KPI's in a container service is reliability, i.e. probability of the event that delivery is done on time. The recent correction of the 2-year long slump in the reliability could be correlated with the flatting of the tariff rate (figure below). |
Source: http://www.ifw-net.com/ |
There are some insights and more info on the topic at the IFW news.
A.O. Chepok
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Wednesday, 1 February 2012
Nichioh Maru: LED, Solar panels and low friction hull. The list is not full
I am proud to present a pure car carrier (PCC) that made the news - m/v Nichioh Maru. Built by Shin Kurushima Dockyard for Nissan she began her maiden voyage on January 27, 2012. This car carrier of 1380 CEU was designed for domestic feeder service between Kanto, Kinki and Kyushu. Owned and operated by Nissan, this ship is the other greener ship following m/v City of St. Petersburg that pursues the Company's zero-emission headway.
One who likes less official visits is recommended reading Bertel Schmitt's report. There are many photos and vivid comments.
I must admit, that besides the advanced engine, LED, solars and super smooth coating Nichioh Maru for me is just the same Japanese style PCC. All in the best simplistic traditions, same cargo decks, same bridge, same accommodations.
See Nichioh Maru's live track at aprs.fi
One who likes less official visits is recommended reading Bertel Schmitt's report. There are many photos and vivid comments.
I must admit, that besides the advanced engine, LED, solars and super smooth coating Nichioh Maru for me is just the same Japanese style PCC. All in the best simplistic traditions, same cargo decks, same bridge, same accommodations.
See Nichioh Maru's live track at aprs.fi
Мітки:
Fleet
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