Ship Launching Airbags

What is ship launching airbags?

Ship launching airbags are known as roller bags, launching air balloons, inflatable marine airbags, air lift bags, and salvage bags. Ship launching airbags are specialized marine rubber air bags that are used for launching marine vessels. ship landing or haul-outs. Marine rubber airbags are also widely used in loading, floating, lifting and moving sunken ships, and salvaging stranded boats. Rubber airbags are made of heavy-duty synthetic-tire-cord layers with inner and out rubber layers in a long cylindrical balloon shape.

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”. This ship launching technology overcomes the restrictions of the fixed launching track of side-launch.

This flexible ship launching technology is accepted by more shipyards worldwide because of its advantages of saving time, saving investment, flexibility, safety. We are 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 construction caissons have all been launched using our ship launching rubber airbags. The biggest vessel launched by ship launching airbags up to 100,000DWT.

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

marine-rubber-airbags-for-ship-launching
marine-rubber-airbags

We are proud to provide the highest quality ship launching airbags, together with expert service and timely customer support for clients from Southeast Asia, Europe, Turkey, Middle-East, North America, Africa, South America.. Let’s help you successfully complete your project – on budget and on time.

Ship Launching Project Video

How to use ship launching airbags

Ship Launching Production

Production and Inspection Airbags

Ship Launching Airbags Material

Our engineering team constantly improves the

Rubber airbags are constructed of an out rubber layer, multi-layer synthetic-tire-cord layers, and inner rubber layer vulcanized firmly. 
Rubber airbags are cylindrical balloon body, with two conical head and end mouth. Swivels and air inlet kits are screwed with end mouth.

marine-rubber-airbags-structure

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. 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 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.

Ship Launching Airbags Rubber Material Performance

No.

Test Item

Value

Standard

1

Tensile Strength, Mpa

≥18

ISO 37

2

Elongation at break, %

11

101

3

Hardness, ° (Shore A)

12

106

4

Tear Strength, N/cm

14

131

5

 Compression set, % (70℃±1℃,22h)

15

116

6*

Holding of pull lengthening, %

21

154

7*

Holding of elongation at break, %

46

236

8*

Change of hardness, ° (Shore A)

58

294

9

Static ozone aging at 40℃ x 96h, extension 20%

68

319

* After thermal ageing at 70℃±1℃, 96 h

Ship Launching Airbags Classification

Launching Airbags Structure

Structure-of-marine-ruber-airbags

Ship Launching Marine Rubber Airbags Specification

You can choose the required diameter and effective length to meet your projects. Refer to how to select marine rubber airbags to know more. The below specification only is our standard specification arrange. Other specifications Ship Launching Airbags also can be supplied upon clients’ request. For other information, you also can refer Airbag Launching.

Air Bag Parameter

Ship Launching Airbags Size

Product Name

Ship Launching Marine Rubber Airbags

Diameter (D)

0.8 ~ 2.5m, or customized diameter

Effective Length (EL)

6 ~ 25m, or customized length

Total Length (TL)

7 ~ 27m, or customized length

Loading Capacity

10 ~ 40 ton/m, or customized capacity

Model of Airbags

QP-ordinary, QG-high-bearing, QS-superhigh bearing

Rubber Airbags End Fittings

marine-rubber-airbags-end-fittings

1. The end of 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. End plug at the tightness end (Q235 H.D.G)

Launching air bags Type and Model

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. Other type is available upon clients’ request.

  • QP – Ordinary air bag – with 3, 4 or 5 layers of cord fabric.
  • QG – high-bearing capacity air bag –  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: QG6/1.5x15
QG6: 6 layers of cord fabric
1.5: diameter is 1.5m
15: length is 15m

Ship Launching Airbags Performance

Air Bags Lifting Capacity Principle

airbag-lifting-capacity

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)

Launching Rubber Airbags Performance Parameters

Type No.

Diameter

(m)

Initial Internal Pressure for Test

(kPa)

Rated Working Pressure

(kPa)

Bearing Capacity at 70% compress deformation

(KN/m)

Minimum Burst Pressure

(kPa)

QP5

0.8

48

210

184

630


1.0

35

170

186

510


1.2

28

140

185

420


1.5

20

110

181

330


1.8

16

90

178

270


2.0

14

80

176

240

QG6

0.8

56

245

215

740


1.0

45

200

219

600

1.2

32

165

217

490

1.5

25

130

218

390

1.8

20

110

220

330

2.0

18

100

220

300

QG7

0.8

64

270

237

810

1.0

50

220

242

660

1.2

38

190

251

570

1.5

29

150

247

450

1.8

25

130

257

390

2.0

23

120

264

360

QG8

0.8

70

300

264

900

1.0

54

240

264

720

1.2

45

210

277

630

1.5

32

170

280

510

1.8

29

150

297

450

2.0

26

140

308

420

Why Our Ship Launching Aribags

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

Rubber-Calendering-Machine

Rubber Calendering of Cord Fabric

Intergral-Winding-Technology

Rubber Airbags Production

Rubber-Airbag-Vulcanization

Rubber Airbags Vulcanization

Final-Quality-Inspection

Rubber Airbags Inspection

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.

Long Lifespan

The design lifespan of ship launching rubber airbags is over 6 years with the correct storage.

What You Have to Know

Ship Launching Airbags. Also known as inflatable marine airbags, roller bags, air lift bags, and salvage bags. Airbags range in size from 0.8 to 2.5m diameter, with lengths of 5.0m to 25.0m ‘effective length’. Airbags are used for ship launching, haul-outs, loading, and floating.

The weight of ship launching airbags is calculated by airbag surface area. When you care too much about weight, you may be misled by some manufacturers. Please remember “It's not that the heavier the airbag, the better the quality. Weight is not a good indicator of quality.”

All Doowin Marine ship launching airbags are manufactured and tested fully compliant with ISO 14409 “Ships and marine technology – ship launching airbags“, certificated by BV, CCS, LR, ABS. There are two Chinese standards and two ISO standards for ship launching airbags production and using.

  1. CB/T 3837-1998 Technological Requirements for ship Upgrading or Launching Relying on Airbags (Shipbuilding Industry Standard, PRC)
  2. CB/T 3795-1996 / CB/T 3795-2009 Air bag for ship up to or down to launching way (Shipbuilding Industry Standard, PRC)
  3. ISO 14409: 2011 Ships and marine technology — Ship launching air bags
  4. ISO 17682:2013 Ships and marine technology — Methodology for ship launching utilizing air bags

It is very easy to distinguish used and new airbags. If there are abrasions on the airbags body, then it is used one. For the new airbags, it’s surface maybe looks ugly and dirty. It is because we use French chalk in the vulcanization process. When the water vapor in the vulcanization tank is mixed with French chalk, the surface will appear very dirty.

Our unique overall winding technology is different from the current mainstream airbag production technology. We innovate and improve on the basis of mainstream production technology. The airbag produced by the optimal winding angle technology can exert the maximum effect of the material, save the cost, and have a stronger lifting force.

We will provide the Manufacturer Certificate and Certificate of Compliance. Meanwhile, we also can provide BV, CCS, LR, ABS third party certificate upon buyer’s request.

Generally speaking, the number of layers refers to the number of layers of the skeleton material, that is the number of layers of the synthetic-tyre-cord fabric layer. The number of layers mentioned by some small manufacturers refers to the number of layers of cord fabric plus the number of layers of rubber. This is very incorrect. They cheat consumers by confusing concepts.

Marine rubber airbags are not single-use products. It can be used for many times. But cannot define the exact number. General speaking marine airbags have 5~8 years lifespan under the correct usage and proper maintenance.

General speaking marine airbags have 5~8 years lifespan under the correct usage and proper maintenance. But it also depends on how frequently airbags were used and how they are maintained and stored. After using 3~5 years, the rubber airbags must be fully inspected to determine if the airbag can continue to be used.

The ship launching airbags price is calculated by the airbag’s surface area, not weight. Rubber airbag has two cone shape ends. But we normally, make the airbags as cylindrical shape to calculate its surface area. Its calculate formal is S=π x Diameter x (Diameter+Effective Length) x layer numbers. Then, multiply the surface area by the unit price. The unit surface price is quite different for different factories, generally it is in the scope of USD4 to USD8 for each square meters.

The storage influences the airbag’s lifespan. So, it is very important. Ship launching airbags should be cleaned with fresh water and dried then powdered with French chalk powder. Ship launching airbags should be stored in cool, dry sheltered place, kept away from chemicals, gasoline, solvent etc. Ship launching airbags can be piled for storing.

Ship launching or upgrading using marine airbags is an innovative technology that has the utmost bright prospect in shipbuilding. It overcomes the disadvantage of fixed track launching by which the productivity of shipbuilding and ship repairing were limited in the small-sized and medium-sized shipyards.

Excellent in Practise

Ship Launching Projects

Based on the ship shapes, the ship may be launched, using air bags, by either end launching type or side launching type.

Meet Our Clients

we work for them

We work for many shipyards, ports, and offshore companies all over the world. 
Welcome you visit Why Doowin Marine to know more information.

Need more information ?

Welcome you contact us to get more information. We will provide more information about ship launching airbag selection, use and storage, launching or landing  technology, etc. Free ISO 14409:2011 and ISO 17682:2013. Investigation on Safety Assessment of Ship Launching with Airbags

Let's win together!

Telephone: +86-532-67730629
Mobile:  +86-186 6025 7896 (WhatsApp)
Email:  sales@doowinmarine.com

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