Floating Marine Rubber Airbag For Ship Launching

Floating marine rubber airbag for ship launching, also known as roller bags or ship launching balloons, are made of heavy-duty synthetic-tire-cord layers with inner and out rubber layers in a long cylindrical balloon shape. Ship launching airbags can be used for the ship launching or ship landing of oil tankers, tugboat or vessels, barges, chemical tankers, tugboats, AHTS vessels, floating docks, and even construction caissons have all been launched using our ship launching rubber airbags. The biggest vessel launched by ship launching airbags up to 100,000DWT.

ship launching relying on ship launching airbags is an innovative ship launching technology, comparing with “end-on launching”, “side ship launching”, “float-out”. This ship launching technology overcomes the restrictions of fixed launching track of side-launch. Ship launching airbags are accepted by more shipyards worldwide because of their advantages of saving time, saving investment, flexibility, safety.

All Doowin Marine ship launching airbags are manufactured and tested fully compliant with ISO 14409:2011 Ships and marine technology — Ship launching airbags. To learn more technology, please kindly refer ISO 17682:2013 Ships and marine technology — Methodology for ship launching utilizing airbags

Construction of Floating Marine Rubber Airbags

Ship launching marine rubber airbags are to be constructed of an out rubber layer, multilayer heavy-duty synthetic-tire-cord layers, and an inner rubber layer vulcanized firmly. Ship launching airbags are cylindrical balloon body, with two conical heads and two end mouths. Airtightness swivel and air inlet kits are screwed with end mouth.

• Synthetic-tire-cord layer

The Synthetic-tire-cord layer is the 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. We 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 airbag 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.

Structure of Floating Marine Rubber Airbags for Ship Launching

The standard ship launching marine rubber airbags include the below spares. Ready for use.

1. The end of the airbag body
2. End flange (Q235 H.D.G)
3. Sealing Washer
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
8. 8. End plug at the tightness end (Q235 H.D.G)

Classification of Ship Launching Marine Rubber Airbags

Ship Launching air bags are categorized by the following three types according to the bearing capacity, per meter in length. We define the number of layers, which means the number of Synthetic-tyre-cord layers, in order to confirm the Safety Working Pressure. Another type is available upon clients’ request.

• QP – Ordinary airbag – with 3, 4 or 5 layers of cord fabric.
• QG – high-bearing capacity –  with 6, 7, or 8 layers of cord fabric.
• QS – Superhigh-bearing capacity air bag – with 9, 10, or more layers of cord fabrics as custom request.

For example: QG6/1.5×15
QG6: 6 layers cord fabric
1.5: diameter is 1.5m
15: length is 15m

Floating Marine Rubber Airbags Features & Advantages

Superior Manufacturing & Quality Control Processes from the selection of raw materials to the highly skilled production process.

High Lifting Capacity

Air bags create high lifting capacity with safer low pressure. One air bag can lift 300~500 ton.

High Tensile Strength

Heavy-duty synthetic-tire-cord layers are the framework material. It can bear high working pressure.

Resistant to Abrasion

Rubber airbags have 6~12 plies reinforcement layers to withstand most abrasion and puncture.

Marine Rubber Airbags Performance

Superior Manufacturing & Quality Control Processes from the selection of raw materials to the highly skilled production process

Floating Marine Rubber Airbags Inspection

We test and inspect all the ship launching airbags purchased based on the test items indicated below:

•  The appearance of each of our ship launching airbags is smooth, glossy, and without blemishes such as crack, blister, delamination, pits, or impurities.
•  The length and diameter of each ship launching airbags are measured under the rated working pressure and are within ±3%.
•  The gas-tightness is tested without carrying any load as per ISO 14409. The pressure loss is less than 5% of rated working pressure within 1 hour.

All Doowin Marine rubber ship launching airbags are manufactured and insepcted fully compliant with ISO 14409 “Ships and marine technology – ship launching air bags“, certificated by CCS, LR, BV. 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