7 Layers Ship Air Lifting Bags Floating Assistant For Large Construction Structure

D1.8 m x L18m x 7layers Floating Assistant Tool Marine Air Bag

Marine Airbags for Ship Launching/Ship Pulling/Salvage

Ship launching using marine airbags is a very popular vessel launching method. It overcomes the shortcomings of the fixed launching track, which limits the productive capability of the small and medium sized shipyards. Now it has become a Flexible Launching Technology, having the merits of time and labor saving, flexibility, reliability and safety in operation and comprehensive economic benefits etc.

• Saving the investment of shipyard construction
• Simple operation, saving of labor and work hours
• Environment friendly

After years of practice and accumulation of experience, we have developed the technology from launching only 1,000 DWT ships to current 100,000 DWT ships and we will achieve more. And now this technology has become a flexible, promising, secure and mature technology. Besides that, these airbags are widely used in slipping of ships and boats of all sizes.

How It Works Using Marine Airbags for Ship Launching and Pulling

1. Place airbags under the vessel between the supporting blocks and inflate them to lift the vessel. And then remove the blocks under the vessel after lifted.

• For the light weight vessel, only several pieces airbags can fully lift the vessel at one time and then remove the blocks and place more airbags for launching.
• For the big weight vessel, it will be lifted step by step. First put the airbags under the vessel. Second: Pump part airbags, if vessel is lifted from blocks then remove blocks. The sequence of block removal is middle first then sides. Third: Adjust inflated airbags’ position to be accurate since during lifting some airbags’ positions are hampered by blocks. Fourth: Pump more airbags to continue release blocks and remove them. Fifth: Repeat pumping and remove until all blocks are removed. During this process some blocks may be difficult to be released, people may pump airbags’ pressure to be high pressure. If high pressure still doesn’t work, people may deflate some groups of airbags and underlay them. Sixth: When all blocks are removed adjust airbags’ position. Seventh: Adjust pressures of airbags.

2. Adjust airbags’ pressures. Check all airbags’ working height, especially airbags at bow, if working heights are less than 0.3 m then people should adjust the airbag’s pressure to increase its working height.

3. Block launching area and prepare good communication for the launch command.

4. When water level reach desired level, cut off pulling ropes and release the vessel. If the launching water area is limited, people may use winch to release the vessel slowly into the water.

5. Reclaim airbags after launch.

Do not be misled by suppliers who supply old re-used rubber, weak

cords with lower number of true layers and more. Top quality Marine Airbags can be used up to 9 years, and in the long run, actually helps you save more!

Why Choose LUHANG Marine Airbags

• 2 or 3-strand cords with great tensile strength
• High quality rubber raw material
• Superb quality and above average thickness for rubber layers
• Strictly comply to the standard of ISO 14409:2001 (E) Ships and marine technology – Ship launching air bags

Raw Materials

Ideally, airbags should be made of new rubber material that adheres to the following standards:

• ISO34-1 Tear Strength ≥400 N/cm
• ISO37 Tensile Strength ≥18 MPa, Elongation at Break ≥400%
• ISO1761-1 Hardness (Shore A) 60±10°
• ISO815-1 Compression Set
• ISO188 Requirements After Thermal Aging
• ISO1431-1 After Static Ozone Ageing

The keyword here is new.LUHANG NEVER uses recycled or reclaimed rubber material in airbag production. This is a huge red flag. Quality rubber makes the foundation of the whole “inflatable roller” idea, especially when it has to bear very high values of weight on top. Recycled and reclaimed rubber have substantially lower elasticity and has a very fast ageing rate which compromises the integrity of airbags. Use these recycled rubber airbags a couple of times and you will realise they burst very easily.

On the other hand, cords play a big role, too. These “two cords” are supposed to be two-strand cords with more than 205 N strength per cord. Some manufacturers, like LUHANG, procure and use a higher strength cord (above required standard) to ensure quality strength; but some other suppliers use two-strand cords with lower strength sometimes. There is also the difference with other cords like dacron cords etc. The difference in use of raw materials can have a cost difference of more than 65%!!

Marine Airbag Specification

• The standard specification of marine airbags.

You can choose the required diameter and effective length to meet your projects.

★Diameter (D): from 0.5m to 5.0m.

★Effective Length (EL): from 5m to 30m.

★Total Length (TL): from 6m to 32m

The above specifications only are our standard specifications arrange. Can be supplied customized size upon customers’ request.

• The standard number of layers

The number of layers, which mean the number of Synthetic-tyre-cord layer, usually, our airbags contain 3,4, 5, 6, 7, 8, 9,10 layers types. Other type is still available upon your request to confirm the Safety Working Pressure.

Layer Quantity Overstatement

Imagine the shock when we encountered some customers came to us asking for a 15-layer airbag!

Most ships/structures can be handled with our 7-layer type airbags, or in some cases (sharp hull or challenging work conditions) maybe up 10 layers. But anything more than 10 is definitely not necessary. These overstatements cause industry-wide confusion, and buyers thought they are getting more with these cheap prices. However, we are convinced our LUHANG 7-layer type airbags would perform better than many of those “15-layer” airbags. Truly reputable suppliers will understand that these high layer counts mean nothing. For those “15-layer” claims, how many layers do you think you are getting?

Also, quantity is not everything. It is vital for the buyers to educate themselves of the difference in quality. And the best part is to try our products to see the difference for themselves!

 LUHANG Marine Rubber Airbag Working pressure

LUHANG Marine Rubber Airbags Advantages

• High precision engineering using 2 or 3 -strand cords with great tensile strength.
• Made from NEW industry leading quality rubber.
• Assurance of true number of layers.
• High-performance quality and above-industry-standard layer thickness.
• Quality detailing jobs, Ex: air valve length, ends’ extra layering, tighter connection with minimal failure etc. These areas are often neglected but extremely important to ensure your safety and maximise your return by prolonging useful life.

Marine rubber airbags use matters needing attention

a. Working pressure control in our safe working pressure.

b. Avoid contact with sharp objects

c. when Long time not need , should wash to dry , placed in a cool dry ventilated place . Storage place away from heat , acid and alkali , oil and grease

Third Party Inspection

Third party inspection is great. Our company happily offers third party inspection certificates from various inspection parties upon customer’s request.As we have mentioned earlier, it is a combination of the finest raw materials and skilful fabrication expertise that makes a product great. The fabrication skill can’t be “inspected” and compared on a newly made product. Besides, some manufacturers like LUHANG even go above and beyond the guidelines to use much higher grade materials in our products.

A more specific example would be product lifespan: product A and product B might work the same for the first two uses, but gradually, you will realise product A degrades, loses its flexibility and strength faster; while product B maintains its performance, and has a much longer useful life. In the long term, you would save more by using product B, even if sometimes it cost a little more upfront.

LUHANG Certification

LUHANG Company has been Certificated by ISO 9001:2009, CCS, BV, SGS, GL, DNV.

Passed Environment Management System Certification, and OHSMS Certification.

LUHANG Products have been approved by CCS, BV, LR, DNV, GL, ABS, V-TRUST and other third party inspector.

Company Information

Qingdao Luhang Marine Airbag and Fender Company is the leading & professional & largest company that initiated airbags for ship launching in China from year of 1998. During 30 years’ development and experience in airbag production and ship launching, our ship launching airbags have become the most reliable. Since then, more cargo vessels, barges, chemical tankers, tugboats, AHTS vessels, floating docks, and even contstruction caissons have all been launched using our airbags. Aside from ship hauling & launching.