Ship Launching Airbags
Ship launching airbags, known as roller bags or ship launching ballon, are made of heavy-duty synthetic-tire-cord layers with inner and out rubber layers in long cylindrical ballon shape. These vessel launching airbags can be used for the ship launching, ship launching work.
The ship launching or upgrading using marine airbags is an innovative ship launching technology. It overcomes the disadvantage of “end-on launching”, “side ship launching”, “float-out”. In other words, this ship launching technology overcomes the restrictions of fixed launching track of side-launch.
So, this flexiable ship launching technology is accepted by more and more shipyards world wide because of its advantages of saving time, saving investment, flexible, safety. DOOWIN is constantly innovating in terms of design, material usage, & manufacturing technologies throughout the years to ensure flexibility, safety and reliability.
Up to now, more cargo vessels, barges, chemical tankers, tugboats, AHTS vessels, floating docks, and even contstruction caissons have all been launched using our rubber airbags. The biggest vessel launched by ship launching arbags up to 100,000DWT.
Now, DOOWIN ship launching airbag is the No.1 choice by companies in Southeast Asia, Europe, Turkey, Middle-East, North America, Africa, South America.
— ISO 14409:2011 Ships and marine technology — Ship launching air bags
— ISO 17682:2013 Ships and marine technology — Methodology for ship launching utilizing air bags
— CB/T 3795-2009 Air bag for ship up to or down to launching way (Shipbuilding Industry Standard, PRC)
— CB/T 3837-2011 Technological Requirements for ship Upgrading or Launching Relying on Airbags (Shipbuilding Industry Standard, PRC)
Construction Features of Ship Launching Airbags
Ship launching airbags are constructed of an out rubber layer, multilayer synthetic-tire-cord layers, and inner rubber layer vulcanized firmly. In additon, the rubber airbags are cylindrical balloon body, with two conical head and end mouth. Swivels and air inlet kits are screwed with end mouth.
Synthetic-tire-cord layer
Synthetic-tire-cord layer is reinforcement layer of the ship launching airbags which are made of rubber coated synthetic-tire-cord fabrics. Many synthetic-tire cord layers are twined at ideal angles by unique and patented “Holistic Wrapping Technology“. To hold the internal pressure and to distribute the stress evenly. DOOWIN use the 1870 dtex/2 type synthetic-tire-cord fabric. The warp is over 95 cords per 100 mm in width. The breaking strength is more than 310 N per cords.
Inner and Outer Rubber
Prior to the air bag production, the outer and inner rubber layers shall be tested to meet the criteria in accordance with the test methods given in the International Standards listed below.
The outer rubber layer covers the outside of ship launching airbags. To protects the cord layers from abrasion and other external forces. This compound has sufficient tensile and tear strength to withstand any weather condition and hard usage.
| No. | Test Item | Value | Standard |
|---|---|---|---|
| 1 | Tensile Strength, Mpa | ≥ 18 | ISO 37 |
| 2 | Elongation at break, % | ≥ 400 | ISO 37 |
| 3 | Hardness, ° (shore A) | 60±10 | ISO7619 |
| 4 | Tear strength, N/cm | ≥ 400 | ISO34-1 |
| 5 | Compression set, % (70℃±1℃,22h) | ≤ 30 | ISO815 |
| 6 | Holding of pull lengthening, % | ≥ 80 | ISO188 |
| 7 | Holding of elongation at break, % | ≥ 80 | ISO188 |
| 8 | Change of hardness, ° (Shore A) | ≤ 8 | ISO7619 |
| 9 | Static ozone aging at 40℃ x 96h, extension 20% | No crack | ISO1431 |
*After thermal ageing at 70℃±1℃, 96 h
Ship Launching Airbags Specification
From the raw materials to the highly skilled production process, our engineering team constantly improves.
Lifting Capacity Principle
The bearing capacity of ship launching 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 (D-H)/2
Where:
F is the bearing capacity
P is the working pressure
S is the contact area
P is the percentage of deformation (%);
D is the original diamater of the air bag (m);
H is the height of the compressed air bag (m)
Ship Launching Airbags Lifting Capacity
Ship Launching Rubber Airbags Accessories
DOOWIN PVC ship launching airbags provide the perfect solution for the light light-weight boat. Their strength, durability and excellent resistance to extreme conditions, makes them ideal as ship launching airbags.
1. The end of airbag body
2. End flange (Q235 H.D.G)
3. Sealing Washer to strength the tightness
4. Three-direction connector at the inflate end (Q235 H.D.G)
5. 3/4′ Ball Valves at the inflate end (Brass)
6. Hose connection at the inflate end (Q235)
7. High quality Pressure Gauge at the inflate end.
8. End plug at the tightness end (Q235 H.D.G)
Why DOOWIN rubber airbags?
THREE-OUR OWN! The whole production process is under ISO 9001:2008 control.
From the raw materials to the highly skilled production process, our engineering team constantly improves.
DOOWIN rubber roller are manufactured and tested to comply with ISO 14409, certificated by CCS, LR, DNV.
Ship Launching Projects
DOOWIN ship launching rollers provide the perfect launching solution.
Their strength, durability, and excellent resistance to extreme conditions, makes them ideal for ship launching.
