Vessel Lifting Underwater Air Bags Docking Thermometer Boat Moving Docking

Vessel Lifting Launching Ship Rubber Airbag Factory

Product Introduction:

6000 years ago, our ancestor begin to use log-rolling method to lift and move weights, which is still widely used in daily production and actual life nowadays. Marine rubber airbag is designed with soft rubber to lift and carry weights, based on log-rolling method.

Ship rubber airbag is an innovative product of Chinese own proprietary intellectual property rights. It has wide application like ship launching & upgrading, caisson lifting & moving, heavy weights lifting, underwater-engineering buoyancy aid. The marine rubber airbag is not limited to space and heavy machinery, which could efficiently shorten the construction period and save lots of funds.

Technical Requirements for Ship Rubber Airbags:

According to CB/T 3795-1996, ship rubber airbags should meet the technical requirements

1. Size deviation
The deviation of diameter and effective length is -2%---+2%,
The deviation of the total length is -4%---+4%

2. Elastic deformation
When using 1.2 times the working pressure as the experimental pressure, the diameter deformation is not more than 5%

3. Safety factor
Safety factor is not less than 4.5

Rubber Marine Salvage Airbags Ship Rescue Airbag ISO14409 0

4. Airtightness
Inflate for 1h, the pressure drop is not more than 5%

5. Appearance requirements
Linear smooth, no cracks and bubbles, heavy skin, mixed impurities and obvious dirt and other visual defects.

6. Safety inflation device
The safety valve should be installed on the capsule, and the trip pressure of the safety valve should be 1.25 times of the working pressure.

Specifications of Ship Rubber Airbags: 

As a soft flexible body, airbag’s shape depends on various factors, such as the shape of ship bottom, ramp shape, width of ship bottom, length of airbag, position of airbag under the ship, etc.
Users should calculate the bearing capacity of airbags basing on above factors, correct bearing capacity accordingly.

Caculation of performance of airbags

Formula: Bearing capacity F=PS

P=pressure in the airbag(MPa)
S=contacting area between ship bottom and airbag(M²)

S= π*(D1-D2)/2

Instruction of application in ship launching

Airbag is more and more widely applied in ship launching project. The application method is ceaselessly improved. The airbag application application method for common medium ship launching ship launching is as below,
1. Based on calculation result, enough rolling airbags and lifting airbags, towing machines and air compressors are prepared. Before using, airbags must be inflated and tested without loading(the testing pressure must be no less than 1.25MPa). In case of air leakage, the airbag must be prepared before using.
2. The way for ship movement, including the way from shipbuilding berth to ramp, must be cleaned and flattened. Sundries must be removed from the way, especially sharp iron nails and stones, to avoid piercing the airbag. The ramp should be long enough and wide in water.
3. All the protruding sharp corners and burrs on casting like ”A” bracket and stern post must be polished to be smooth.
4. Fasten the hull with the steel cable of winch.
5. Close the sea chest valves of ship, fix the rudder and propeller.
6. There are many ways to remove all blocks and fill in the rolling airbags. Here we recommend two methods as below. User may choose one basing on the equipment conditions such as ship weight, amount of the airbags, etc.
(A)For light ship, the bearing capacity of the airbag is large enough to lift the ship away form the blocks and therefore blocks can be removed directly and fill in the airbags.
(B)For heavy ship, lifting airbags can be adopted to lift the bottom of stern. Before lifting, firstly specify the optimum position of the front-pivot and lifting airbags. According to the figure as below,

the closer the front pivot to the center of gravity the better, however, it will result in too many blocks around of the front-pivot, which means a lot of workload to remove the blocks manually. Therefore, the position shall be determined reasonably considering such elements as ship length, etc. If possible, the lifting airbags shall be located in the stern. However, the location is also subject to line shape of the stern as the lift of the lifting airbag will not be enough if the bottom is too high to the ground. In this condition, it would be better move forward. Therefore, the optimum position of the front-pivot and lifting airbags shall be decided after specific calculations as the case varies from ship to ship.
Q*Lq＞W*Lw

In the formula,
Q=lift of the lifting airbag
W=weight of ship
Lq= the distance from the lift center of the lifting airbag to the front-pivot
Lw=the distance from the center of gravity of the ship to the front-pivot
7. Firstly, remove all the blocks in the lifting airbags and the ones around the front-pivot. Then fill the lifting airbags and start inflating until the bottom separates slightly from the blocks. Remove blocks one by one from middle to the stern. Whenever blocks of the section are removed, fill in the rolling airbags immediately in the planned position and inflate it appropriately. Followed by continuous block removing until all blocks in the stern are completely removed and the rolling airbags are filled in.
8. Remove blocks from the middle of the ship to the front-pivot and fill in all rolling airbags in the front by modifying pressure of the airbags filled in the stern or similar methods as mentioned above. Of sake of safety, add removed blocks in appropriate number between the filled rolling airbags at any time. The blocks will not be removed until the rolling airbags can support the weight of the ship. Besides, when removed blocks of the same section, it shall be started from middle to both sides. When remove the outermost block, workers shall carry out the work outside the fender.
9. Adjust pressure in the airbags so that the bottom can be lowered to appropriate working height. Make sure that the bottom will not touch the ground while moving the ship. For average small-size ship, the working height could be chosen within the arrange of 0.2m-0.3m.
10. All airbags shall be pointed at the center of the ship and perpendicular to the launching direction.
11. Start the traction winch to release steel cable slowly followed by slow movement of the ship. When the forefront airbags located in the front part separates from the bottom, it shall be placed under the stern immediately and fill in the airbags according to the arrangement space of the airbags defined in the calculations.
12. Repeat the above process to move the ship to waterside slowly. When the airbags can’t be filled in, block the river and forbid any ships to pass.
13. Evacuate personnel in the dangerous zone, Inform staff on the ship to get ready. When conditions such as water depth and so on are enough, cut cable or unhook to shat the ship can launch quickly. If the river is too narrow to realize quick launching, release the cable slowly by traction winch to launch the ship slowly.
14. For large ships, it is necessary to install anti-slip device.
15. Collect the airbags.

FAQ:

Q1: The length you marked is effective or total length ?

Answer: All the size we marked is effective length, not include the cone head parts.

Q2: What's your MOQ?

Answer: Our MOQ is 1pc.

Q3: How about the lifespan of your ship rubber airbags?

Answer: Designed lifespan of our ship rubber airbags is  6 to 10 years

Q4: What's your warranty period?

Answer: Our warranty period is24 monthes. we will responsible for the repairment or replace the new ones for you if it proved to be our quality problem.

Q5: What kind certificate you can provide.

Answer: CCS. SGS. BV,  etc.certificate is available

Q6: I have ships but don't know how to choose the ship rubber airbags size and quantity, can you help ?

Answer: Don't worry. We have more than 20 years' experience. Pls tell us your ship information, we can suggest suitable size and quantity for you.

Q7: I want to try your ship rubber airbags, but I never use it and don't know how to use, can you help ?

Answer: Yes, we will send instruction book together with the ship launching airbags.