Maritime-Evergreen: 八月 2013

2013年8月26日星期一

THE SELECTION OF SHIP LAUNCHING AIR BAG

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How to select ship launching airbags?

The type code and specification of air bags should be selected according to type, dimensions, and launching weight of the ship.
Air bag bearing capacity
The bearing capacity is different if the air bags' type code and specification are different. To guarantee safety, air bag's capacity should meet the requirements of the ship launching weight.

Before the ship launching using air bags, launching calculation should be carried out. The total air bag bearing capacity should be calculated by ship launching weight. According to the total

bearing capacity and ship bottom area, the quantity and type code of air bags will be selected.

Air bag diameter
The air bag diameter is mainly decided by the ship blocks' height. Ship lifting from blocks is the most important stage in the air bag launching process. At this stage, the ship whole weight is to

be lifted by air bags, and the air bag working height must be larger than the block height. The air bag diameter should be selected according to the block height. The air bag diameter must be

increased by 0.5m-0.7m, which is based on the block height, otherwise the air bag bearing capacity may be not enough.
At present air bags with diameter less than 1.2m can only be applied on small ships. Air bags with diameter 1.5m or 1.8m are used to launch over 10,000DWT ships. For block height larger than 0.9m,

diameter 1.5m air bags are mostly chosen for the launching. For block height larger than 1m, diameter 1.8m air bags are preferred.
Air bag length
For small ships, the air bag length should be slightly larger than the ship molded breadth. Air bag length can be decided by the formula: B<L<B+D (where: B is the ship molded breadth; L is air bag

length; D is air bag diameter)
When moving a tug, a fishing boat and the like ship with small block coefficient, air bag ends must extend out of the ship sides, to get good stability of the ship moving. The extended length at

each side should be slightly larger than air bag diameter.
For medium ships, the extended length at each end shall not be very long. For example, a normal ship like cargo ship with block coefficient CB > 0.75, airbag should be equal to the breadth of flat

bottom at mid-ship (the breadth excludes arc part at bilge).
For large ships, if existing airbag length is shorter than the flat bottom breadth, the longest air bags should be ordered. The airbags layout can be interlaced mode or twin-row mode. We would like

to provide advice and suggestion according to customer's specific situation

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2013年8月12日星期一

Top largest shipyards in the world

authorities of being sustainable, energy efficient, and eco-friendly.
The top shipbuilding companies around the world have recognized this need and have excelled in this area and have thus

evolved as the biggest productive shipyard in the world.
In this article we listed top 10 Shipbuilders in the world in terms of Gross Tonnage:
10. Shanghai Waigaoqiao – Shanghai, China

Shanghai Waigaoqiao shipyard is the number one shipbuilding company in China with the total gross tonnage production until

date of 15, 096,900 GT, which includes164 ships of various types and sizes.
9. Imabari Shipbuilding – Marugame, Japan

Imabari Shipyard built the world first vehicle Carrier –“American Highway” and has delivered VLCC of 300,000 DW. The

Gross tonnage production till date is 15,692,687 GT which includes 393 ships.
8. Hyundai Mipo – Ulsan, South Korea

One of the most versatile production house in terms of conventional and specialised vessels, Hyundai Mipo is famous for

delivering mid size chemical tanker and Panamax container ships. The Gross tonnage production till date is 16,715,650 GT

which includes 618 ships
7. Oshima Shipbuilding – Oshima, Japan

Oshima Shipbuliding has a specialisation in building bulk carrier ships with gross tonnage production till date of

16,983,004 GT which includes 539 ships.
6. Tsuneishi shipbuilding – Numakuma, Japan

Tsuneishi is the leading shipbuilding company in Japan with specialisation in building medium sized Bulk carrier ships. The

Gross tonnage production till date is 17,824,038 GT which includes 492 ships.
5. Mitsubishi Heavy Industry – Nagasaki, Japan

Second in rank within Japan and 5th in the world, Mitsubishi H I has its specialization in commercial vessels such as oil

tanker and cruise ships. The total gross tonnage production till date is 19,506,548 GT which includes 315 ships.
4. Hyundai Samho – Samho, South Korea

Another Key player from Korea, Hyundai Samho is located in Yeongam with production capacity of approximately 40 vessels per

year. The Gross tonnage production till date is 28,414,515 GT which includes 372 ships.
3. Samsung Heavy Industry – Geoje, South Korea

Samsung H I shipbuilding company is one of the top three shipbuilders in the world with specialisation of special purpose

vessels like FPSO, LNG etc. The total Gross tonnage production till date is 58,082,349 GT which includes 785 ships.
2. Daewoo Shipbuilding – Okpo, South Korea

Another giant in this sector and second in the world is Daewoo Shipbuilding, located in Okpo and known for its sustainable

and giant ships. The future delivery includes much talked about Maersk EEE class vessels. The total production of Daewoo

shipyard is 68,284,087 GT which includes 834 ships.
1. Hyundai Heavy Industry – Ulsan, South Korea

The Leader in the Shipbuilding sector, Hyundai Heavy Industry is based on Ulsan with a record of 93,893,700 GT which

includes 1428 ships of various types and sizes.

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Developments of Yokohama Fenders

History of yokohama fenders

YOKOHAMA Floating Pneumatic Fender -it was developed in 1958 based on the rubber company's technology for automobile tires and rubber aircraft fuel tanks just to replace the use of whales as shock absorbers between ships when they come alongside each other for transferring supplies. With its high performance and durability, the Yokohama Floating Pneumatic Fender rapidly gained popularity during the large-scale tanker era in the latter half of the 1960's and have been used for transfer of cargo from one ship to another ship or jetty from anything from small vessels to the largest bulk carriers and 500,000 tons ULCC oil tankers.

Application of yokohama fenders
Floating pneumatic fenders are used world wide for ship-to-ship (STS) transfer operations, terminals, and for all kinds of ships. Since its creation until today, more than 45,000 fenders have been supplied worldwide both for ship-to-ship and ship-to-dock operations serving many customers. These fenders play a critical role in the safe operation of ship berthing and mooring operations worldwide.