Jerry Marine Ship Launching Airbags

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.

What Makes High Quality Ship Launching Airbags

Outer Rubber

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 ItemRequired ValueTest Method
1Tensile strength, MPa≥18ISO 37
2Elongation at break, %≥400ISO 37
3Hardness, ° (Shore A)60 ±10Row 3, Content 2
4Tear strength, N/cm≥400ISO 34-1
5Compression set, % (70 °C ± 1 °C, 22 h)≤30ISO 815-1
6After thermal ageing at 70 °C ± 1 °C, 96 hHolding of pull lengthening, %≥80ISO 188
7Holding of elongation at break, %≥80ISO 188
8Change of hardness, ° (Shore A)≤8ISO 7619-1
9Static ozone ageing at 40 °C ×96 h [ozone concentration (50 ± 5) × 108], extension 20 %No crackISO 1431-1

Synthetic-Tire-Cord Reinforcement Layer

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”

ItemUnitTechnical StandardMeasured Value
Breaking StrengthN/cord≥303.8314.5
CV of Breaking Strength≤5.01.6
Elongation at Specified Load8.0±0.88.26
Elongation at Break22.0±2.021.6
CV of Breaking at Break≤7.51.7
H-Drawing ForceN/cm≥166.6193.8
Dry Heat Shrinkage(160C×2ming)≤6.55.18
Moisture/Water Content≤1.00.30
Dip Pick-up4.5±1.04.36
TwistFirst TwistT/m320±15319.4
Twist Second320±15320.5

End Fittings

Marine Ship Launching Airbags Features and Advantages

1.Flexible and economical solution for dry docks ship launching
2.Suitable for various lauching ramp angle and ramp flatness
3.Less underwater construction for shipyards
4.Super long life span up to 6-8 years (due to operation & storage)
5.Adapt to various harsh environments and tough launching conditions
6.Super-high Tensile Strength and ultra-high wrking pressure up to 0.8MPa

Ship Launching Airbag Technical Specifications

SeriesModelDiametermWorking PressureMpaWorking HeightmBeating CapacityTon/m

ISO 14409:2011 Ship Downslip Airbags Material Standard

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.

How to Choose Suitable Ship Launching Airbags?

There are some questions to make sure before offering competitive price and technical solution

1.Type of vessel?
2.LOA (length) of ship?
3.Width of vessel?
4.Vessel’s actual launched weight?
5.What is the vessel’s DWT?
6.Type of ground ship is built on? (Dirt, concrete, etc.)
7.Depth where the ship first enters the water?
8.What’s the angle degree of slipway? (Land)
9.Please provide the low/high tide schedule at site.
10.The working height? (The block stand height)
11.Distance from bottom of propeller to the water level?
12.Distance from back of vessel to the water entry point?

Acceptance Test for Commercial Ship Launching Airbags

  • The appearance of each Jerryborg Marine ship launching airbag is smooth, glossy and without blemish such as crack, blister, delamination, pits, or impurities.
    The length and diameter of each Jerryborg Marine ship launching airbags are measured with the rated working pressure and is within ±3%.
  • The gas-tightness is tested without carrying any load as per ISO14409. The pressure loss is less than 5% of rated working pressure within 1 hour.
  • 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.

Ship Launching Airbags Burst Test

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.

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