Anti-Twist Design
High Impact Resistance
Safety Factor > 5.0
Does Not Damage Hull Paint
CHARACTER OF Evergreen ship launching airbags
Anti-Twist Design
For airbags over 15 meters in length, anti-twist technology is crucial — especially for vessels that must be moved more than 20 meters before launching. Evergreen airbags eliminate the risk of accidents caused by twisting.
High Impact Resistance
Airbags often endure intense localized impacts during stern or bow drops. Evergreen has optimized airbag structure based on theoretical modeling and field testing to eliminate weak points and enhance impact resistance.
Dynamic Compression Safety Coefficient > 5.0
Most lab tests are quasi-static (near isothermal), but in actual launches, airbags undergo rapid, near-adiabatic compression. Evergreen is the first in the industry to establish a dynamic test lab, ensuring each airbag is optimized for real-world performance.
Does Not Damage Hull Paint
Ordinary airbags often damage hull coatings. Evergreen airbags feature a special polymer coating that reduces friction and protects the vessel’s paint during launching.
Applications
SHIP LAUNCHING AIRBAG Applications
- Launching of ships up to 30,000 tons in light weight
- Suitable for all ship types: barges, bulk carriers, oil tankers, tugs, and double-bottom vessels
- Not limited to ships — applicable for launching steel caissons, concrete structures, and more
Safe for any hull — V-shaped or flat
Tugboat launched with ship launching airbags
1,100 tons catamaran launched with Evergreen Launching Airbags
8000 Tons oil tanker launched with Evergreen marine airbags
Performance of ship launching airbags
| Diameter(m) | Working Height (m) | Lifting Force (Tonne/m) | Working Pressure (MPa) | ||||
| 5- layer | 6-layer | 7-layer | 5- layer | 6-layer | 7-layer | ||
| 1 | 0.6 | 10.7 | 12.6 | 14.4 | 0.17 | 0.2 | 0.23 |
| 0.5 | 13.3 | 15.7 | 18.1 | ||||
| 0.3 | 18.7 | 22 | 25.3 | ||||
| 1.2 | 0.9 | 6.6 | 8 | 9.4 | 0.14 | 0.17 | 0.2 |
| 0.8 | 8.8 | 10.7 | 12.6 | ||||
| 0.7 | 11 | 13.3 | 15.7 | ||||
| 1.5 | 1.2 | 5.2 | 6.1 | 7.1 | 0.11 | 0.13 | 0.15 |
| 1 | 8.6 | 10.2 | 11.8 | ||||
| 0.9 | 10.4 | 12.2 | 14.1 | ||||
| 1.8 | 1.3 | 7.1 | 8.6 | 10.2 | 0.09 | 0.11 | 0.13 |
| 1.1 | 9.9 | 12.1 | 14.3 | ||||
| 0.9 | 12.7 | 15.5 | 18.4 | ||||
| 2 | 1.2 | 10 | 12.6 | 15.1 | 0.08 | 0.1 | 0.12 |
| 1 | 12.6 | 15.7 | 18.8 | ||||
| 0.8 | 15.1 | 18.8 | 22.6 | ||||
Precautions for Using Shipping Launching Airbags
During static lifting, the internal pressure of the airbag can reach up to twice its rated working pressure.
During rolling launch operations, the airbag pressure should not exceed the rated working pressure.
The designed service life of Qingdao Evergreen airbags is 6 years; actual service life depends on usage frequency and maintenance practices.
For repaired airbags, the working pressure should be appropriately reduced according to the condition of the airbag.
How to Select Marine Airbags for Your Ship Launching Project
Airbag Diameter
· The airbag diameter should be larger than the height of the keel blocks beneath the ship. This applies to both ship launching and drydocking operations.
· Adequate is sufficient — if smaller diameter airbags can meet the project requirements, there is no need to select larger ones.
Airbag Length
· If the ship’s beam is less than 20 meters, the airbag length should be no less than the beam.
· If the ship’s beam is between 20 and 50 meters, the airbag length should be at least half of the beam.
Number of Airbag Layers (Plies)
· Normally, 6-ply airbags are suitable for most launching projects.
· Increasing the quantity of airbags is often more effective than simply increasing the number of plies.
· If the effective contact area under the ship is limited and additional airbags cannot be added, higher-ply airbags can be selected.
Choosing the appropriate number of airbags depends on many factors, including the ship type and weight. The best approach is to consult with engineers from Qingdao Evergreen Maritime for customized recommendations.
Ship launching calculation
While rough calculations can be done manually, every project is different. For accurate results, it’s highly recommended to: Consult experienced engineers of Qingdao Evergreen Maritime to get a tailored plan with drawings, calculations, and safety reviews.
Technical Services
Qingdao Evergreen Maritime has a strong technical team capable of providing one-stop solutions for customers. Our services include airbag selection, launching equipment supply, on-site technical support, airbag maintenance, and more — ensuring a worry-free experience when using Evergreen marine airbags.
Evergreen Quality, Trusted Worldwide
Airbag invention patent
BV certification
CSS certification
