Ship launching airbags are known as marine upslip airbag, ship downslip balloon, inflatable marine airbags, boat lifting airbags. They are specialized marine rubber air bags used for launching marine vessels. Flexible ship launching is an innovative technology that has the extremely bright prospect in shipbuilding and ship repairing industry. It overcomes the disadvantage of fixed track launching by which the productivity of shipbuilding and ship repairing were limited in small-sized and medium-sized shipyards.
The airbags are widely used in cargo boat launching and landing, lifting and moving sunken ships, and salvaging stranded boats. The flexible launching technology is highly versatile and helps companies in the shipbuilding and maritime industry save effort, time, work load and investment.
Jerryborg Marine is the leading manufacturer for ISO14409:2011 or CB/T 3795 rubber airbags/marine inflatable airbags, supplying to shipyards & trading companies in over 6 continents for ship launching, repairs & mobilisation use. Our ship launching airbags have sizes up to 2.5m in diameter and 26m in length for supporting and transporting heavy structure up to more than 10,000 tonnes. Some marine airbags for salvage buoyancy purposes can go up to 4.0m in diameter.
To protect the reinforcement tyre cord layers from abrasion and other external forces, the rubber compound much have sufficient tensile and tear strength to withstand any weather condition and hard usage. Prior to the air bag production, the outer and inner rubber layers shall be tested to meet the criteria in the following table of ISO14409:2011 in accordance with the test methods given in the International Standards listed as well in the table.
|No.||Test Item||Required Value||Test Method|
|1||Tensile strength, MPa||≥18||ISO 37|
|2||Elongation at break, %||≥400||ISO 37|
|3||Hardness, ° (Shore A)||60 ±10||Row 3, Content 2|
|4||Tear strength, N/cm||≥400||ISO 34-1|
|5||Compression set, % (70 °C ± 1 °C, 22 h)||≤30||ISO 815-1|
|6||After thermal ageing at 70 °C ± 1 °C, 96 h||Holding of pull lengthening, %||≥80||ISO 188|
|7||Holding of elongation at break, %||≥80||ISO 188|
|8||Change of hardness, ° (Shore A)||≤8||ISO 7619-1|
|9||Static ozone ageing at 40 °C ×96 h [ozone concentration (50 ± 5) × 108], extension 20 %||No crack||ISO 1431-1|
Reinforcement layer of the ship launching airbags are made of rubber dipped synthetic-tire-cord fabrics. bespoken synthetic-tire cord layers are twined at ideal angles by unique and patented “Holistic Intertwined Technology” which hold the internal pressure and distribute the stress evenly in the operation process. Jerryborg Marine use the 1400dtex/3 type synthetic-tire-cord fabric. The breaking strength is more than 310 N per cord, which is higher than the technical requirement marked in ISO14409:2011 “5.1.3 As a reinforcing material, the warp should be (90±5) cords per 100 mm in width, and the breaking strength shall be more than 205 N per cord”
|Item||Unit||Technical Standard||Measured Value|
|CV of Breaking Strength||％||≤5.0||1.6|
|Elongation at Specified Load||％||8.0±0.8||8.26|
|Elongation at Break||％||22.0±2.0||21.6|
|CV of Breaking at Break||％||≤7.5||1.7|
|Dry Heat Shrinkage(160C×2ming）||％||≤6.5||5.18|
|Series||Model||Diameter（m）||Working Pressure（Mpa）||Working Height（m）||Beating Capacity（Ton/m）|
ISO 34-1, Rubber, vulcanized or thermoplastic— Determination of tear strength.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties.
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815-1, Rubber, vulcanized or thermoplastic — Determination of compression set.
ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking.
ISO 7619-1, Rubber, vulcanized or thermoplastic — Determination of indentation hardness.
There are some questions to make sure before offering competitive price and technical solution
Jerryborg Marine ship launching airbags are type approved, which means we have demonstrated the performance of ship launching airbags to independent inspectors CCS or BV. Type Approval Test is the essential and necessary qualification of qualified manufacturer of ship launching airbags. In addition to the requirements for the material, appearance, and dimensional tolerances, “Gas-tightness Test”, “Compression Test”, “Bearing Capacity Test”, “Bursting Test”, and “Compression-recovery Test” are carried out.
All Jerryborg Marine ship launching airbags are manufactured and tested comply with ISO 14409 “Ships and marine technology – ship launching airbags“, certificated by CCS, LR, DNV. There are two more China industrial standards and one ISO standard for ship launching airbags:
— CB/T 3837-1998 Technological Requirements for ship Upgrading or Launching Relying on Airbags (Shipbuilding Industry Standard, PRC)
— CB/T 3795-1996 / CB/T 3795-2009 Air bag for ship up to or down to launching way (Shipbuilding Industry Standard, PRC)
— ISO 17682 Ship sand marine technology —Methodology for launching ship utilizing air bags.