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Customer first ! Quality first !
4 Years
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| Brand Name : | Shunhang |
| Model Number : | SH-SRA 18 |
| Certification : | CCS, SGS, BV |
| Price : | USD200 to 7000/PC |
| Payment Terms : | T/T-30% in advance, 70% before delivery |
| Supply Ability : | 500 PCS/Month |
| Delivery Time : | Within 15 workdays |
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:
| Some common sizes of our ship rubber 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 |
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.
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