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Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags

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Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags

Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags
Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags

Large Image :  Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags

Product Details:
Place of Origin: China
Brand Name: Shunhang
Certification: ABS
Model Number: SH-MSL 15
Payment & Shipping Terms:
Minimum Order Quantity: 1PC
Price: USD320 to 7000/PC
Packaging Details: Nylon bag
Delivery Time: within 15 workdays
Payment Terms: Wire Transfer 30% in advance , 70% before delivery
Supply Ability: 160 PCS/Month

Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags

Description
Product Name: Floating Type Good Air Tightness Mairne Salve Airbags Application: Sunken Ship Salvage, Refloating
OEM: Available Diameter: Cuatomized
Effective Length: Customized Warranty: 2 Years
Inflate Accessories: Included Packing: As Requested
Highlight:

Floating Type Marine Salvage Airbags

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Good Air Tightness Marine Salvage Airbags

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Sunken barge launching airbags

Floating Type Good Air Tightness Mairne Salve Airbags

 

Product Introduction:

 

The history of heavy lifting airbag dates back to 1981. Xiao Qinghe ship repair and building shipyard, located in Jinan city of Shangdong Province, launched a 60 DWT tank barge with airbag suspension on January 20, 1981. Seven airbags were deployed in that project. One was 2 meters in diameter and 6 meters long and used for elevating. The remaining six airbags were 0.8 meters x 6 meters long and acted as the rollers. The first intention of that trial launch was to develop a prompt, less landform limited ship launching method for warfare purposes.

 

How has the technology advanced since then?

 

Over the past twenty years, the airbag ship launching system has made advancements in not only the airbag, but also the ship launching/landing technology. The first generation airbags used a rubber dipped canvas as a reinforcement layer to form the air chamber trunk. Two cone-shaped molds were then used to make the ends and everything was stuck together.

With today’s airbags, the whole-enlacing-technology used for manufacturing is done together. Rubber dipped synthetic-tyre-cords are used as the reinforcement layers with the trunk and two cone-shaped ends made at the same time. Everything is then-laced together, so the airbag doesn’t have any joints. Due to the development of rubber chemistry, the performance of the rubber employed in the latest airbags is highly enhanced and about 15 times that of the first generation bag with the same specifications.

The launching and landing technology has also developed. In the beginning, only small and flat bottom ships located on a fabricated slope could be launched with airbags. Now this technology is more flexible and less limited by the ship and landform. Now any type of ship with a DWT below 55,000 and in a place with enough launching space can be launched using airbags. The launching slope even can be sloped upward. It has really developed into a cutting edge technology for launching ships, and especially useful for some marine emergencies.

 

The structure of Marine Salvage Airbag:

 

Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags 0

Structure of Marine Salvage Airbag

1. Terminal iron

2. Cone airbag body 

3. Cylindrical airbag body

D: Diameter of airbag

L: Valid length of airbag

Loa: Total length of airba

 

Specifications: 

 

Some common sizes of our marine salvage airbags, customized sizes are also available
Diameter(m) Effective Length(m) Layer Pressure(MPa)
1.0 10 5~6 0.07~0.10
1.0 12 5~6 0.07~0.10
1.0 15 5~6 0.07~0.10
1.2 10 5~6 0.08~0.12
1.2 12 5~6 0.08~0.12
1.2 15 5~6 0.08~0.12
1.5 12 5~8 0.08~0.16
1.5 15 5~8 0.08~0.16
1.5 18 5~8 0.08~0.16
1.5 20 4~8 0.08~0.16
1.5 24 5~8 0.08~0.16
1.8 12 5~8 0.08~0.15
1.8 15 5~8 0.08~0.15
1.8 18 5~8 0.08~0.15
1.8 20 5~8 0.08~0.15
1.8 24 5~8 0.08~0.15
2.0 18 6~10 0.08~0.18
2.0 20 6~10 0.08~0.18
2.0 24 6~10 0.08~0.18
2.5 18 7~10 0.07~0.13
2.5 20 7~10 0.07~0.13
2.5 24 7~10 0.07~0.13

 

Lifting Capacity

 

Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags 1

The bearing capacity of heavy lifting airbags were calculated based on the working pressure, contact area. Herein, working pressure was got upon the burst pressure and safety working factor.

Because of the flexibility of rubber airbag, the contact area will be effected by some terms. It inludes carried shipcondition, the different position from gravity center during the process of ship launching and landing. So the bvearing capacity of rubber airbags will vary as well as the contact area.

The approximate bearing capacity can be calculate as follows:

F=PS S=π x (D1-D2)/2

Where:

F is the bearing capacity
P is the working pressure
S is the contact area
P is the percentage of deformation (%);
D1 is the original diamater of the airbag (m);
D2 is the height of the compressed airbag (m)

 

Instruction of Airbag Repair

 

If the airbag is damaged, it can be repaired as long as the rubber doesn’t age seriously(with no crack and stickiness on the surface). And the cords fabric is not loose and rotten. Repair can be made by hot vulcanization or auto-vulcanization. The tolls and repair materials utilized in the former are quite simple. We recommend hot vulcanization, the steps are as below,

 

1.  Wash the airbags to make sure it is clean both inside and outside and without mud & sand,
oil stain and water logging. Then dry the surface. Note: the immersion time while washing can’t more than 10 minutes.

 

2.  Mark the repair symbol visibly. Mark the repair area and the mark area is allowed to exceed 15mm, don’t miss the concealed damage.
 

3.  Prepare the backing
The material of backing is the same as the airbag and the arrangement angle of the cord fabric is consistent with the airbag.
The first layer of the backing is a vertical line. Length=(length of the flaw+50mm)X2
The second layer of the backing is oblique line whose angle is the same as the airbag. It is 20mm larger than the periphery of the first layer.
The third layer of the backing is also oblique line whose angle is opposite to and crosses with the second layer. It is 20mm large than the periphery of the second layer.
The fourth, fifth and sixth layer may be deduced by analog.
The fillet transition with the radius of 40mm-50mm is required for the backing periphery of every layer.
If the wound is a nail hole within 100mm or strip wound in 50-70mm, cross backing shall be prepared. Nylon cross backing is made by bluing two layers of coated Nylon with the crossing of 90°. Its size is 200mmX200mm and others are the same as the backing.

 

4.  Filing the wound
File the wound with steel files or flexible shaft filing machine. The file pattern on the surface should be delicate and even as well as without any rubber scrap, particle. Filing surface depth is about 0.5-1mm. The periphery is 20mm larger than the backing. Breaking and loose is not allowed for filed cord fabric. After filing, blow always the rubber scrap by brush and compressed air.

 

5.  Brush glue and dry
The whole process must be kept clean. Brush thin glue for the first time (glue: gasoline=1:8).There should be no sediment and caking, should be evenly. Forcibly gluing should be performed so that the glue can penetrate into the cord fabric layer in the file slot. The gluing should be uniform and obvious scaffold erecting is not allowed.

 

6. Viscose
Firstly, brush a layer of base glue with the thickness of 1±0.2mm on the periphery of the wound. Cool down to not gluing hands, paste and press and the glue should not be too tight in case glue failure happens after the new glue contract, then paste the backing. The center of the backing should be targeted at the wound center. The angle of the backing should be in consistent with the airbag line layer. For wound larger than 1M, a layer of coated Nylon fabric should be pasted to the wound, 25mm lager than the wound. Then paste the backing. In the end, one sealing rubber (thickness of 0.8-1mm,wideth in 20mm) should be pasted to the cover the joint of backing edge and body of airbag.

 

7. Vulcanization
For normal shipbuilding yard, the following simple method can be adopted: set up a frame, ( as shown in the figure) and provide plate, sand bag(fill the inner tube of the abandoned automobile with sand), jack and heated plate(pig iron or steel plate in Dia300mm ,thickness 25mm). The vulcanized airbag to be repaired should be targeted to the center in accordance with the position shown in the figure. First vulcanize the hole and then the wound. If the large wound to be vulcanized exceeds the effective length of the vulcanization, the center should be vulcanized firstly then both sides. The heated plates should overlap 15mm with the previous position in re-vulcanization. The vulcanization shall be finished within 40-50 minutes when the temperature rises to 135±5℃ and pressure is 0.8-0.12MPa.

 

8.  Check whether the repair is bound tightly or not, Flaw such as void, delaminating or sponge and so on are not allowed. As to new glue in heating area, aging, crack, under vulcanization and over vulcanization is not allowed. Inflating test shall be conducted if the repair is qualified.

 

Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags 2

 

Floating Type Marine Salvage Airbags Good Air Tightness Sunken Barge Launching Airbags 3

 

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Contact Details
QINGDAO SHUNHANG MARINE SUPPLIERS CO., LTD.

Contact Person: Cathy Zhang

Tel: +86 18560625373

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