High - strength 2m×20m Multi - functional Professional Airbags for Ship Operations Made in China on Hot Sale

I. Product Introduction

These airbags for ship operations are meticulously crafted from high - strength synthetic tyre - cord reinforcement layers and high - quality rubber layers. They were officially introduced in 1980. On January 20, 1981, Xiaoqinghe Shipyard successfully launched a tank barge using these airbags, marking the beginning of a new chapter in the application of ship airbags. Since then, an increasing number of shipyards have used them for the launching of small - and medium - sized vessels. In recent years, with the continuous advancement of material technology, high - strength materials have been widely used in airbag production, significantly enhancing the load - bearing capacity of these airbags, and they are now commonly employed in the launching of large - scale ships.

II. Airbag Structure

Dimensions

The diameter (D) of the airbags comes in a variety of specifications, commonly including 0.8m, 1.0m, 1.2m, 1.5m, 1.8m, etc.

The length (L) of the airbags can be customized according to the actual needs of users.

Model Classification

Based on the number of synthetic tyre - cord reinforcement layers, the airbags can be classified into 3 - layer, 4 - layer, 5 - layer, 6 - layer, and other models. Generally, the number of layers is less than 10.

Load - bearing Capacity

The maximum load - bearing capacity of the airbag refers to the maximum weight it can bear without permanent deformation or damage. The calculation formula is: Load - bearing Capacity = P1×W1×L (where P1 is the internal pressure of the airbag, W1 is the width of the airbag in contact with the ship bottom, and L is the effective length of the airbag).

Materials

The airbags are composed of synthetic tyre - cord layers, and sometimes inner and outer rubber layers are added. All materials are firmly vulcanized to ensure the performance and durability of the airbags.

III. Launching Methods

 

Advantages of the Airbag - launching Method

This method has several notable advantages. It requires less permanent infrastructure, reducing construction costs and time. The risk of accidents during the launching process is relatively low, and the overall cost is also lower compared to some traditional launching methods. The airbags provide stable support to the ship's hull, and through their rolling motion, they smoothly guide the ship into the water. This approach is considered safer than side - launching, as it offers more even force distribution and better control over the ship's movement.

Airbag ArrangementEnd - launching Type

Linear Arrangement: This arrangement is selected when the width of the ship is not greater than the effective length of the airbag. In this case, the airbags are placed in a straight line under the ship, providing a simple and efficient way to support and launch the vessel.

Staggered Arrangement: When the width of the ship is greater than the effective length of a single airbag but less than that of two airbags, the staggered arrangement is used. This configuration allows for better coverage and support of the ship's bottom, ensuring a stable launch.

Two - lines Arrangement: For ships with a width greater than the combined effective length of two airbags or for special - shaped ships such as catamaran high - speed craft or split - hopper barges, the two - lines arrangement is employed. In this setup, two rows of airbags are placed under the ship, with a distance of more than 0.2m between the near - ends of the airbags in each row. This ensures sufficient support and stability during the launch.

Side - launching Type: This type is suitable for small flat - bottomed ships. By placing the airbags on the side of the ship, they can effectively push the ship into the water. This method is relatively simple and convenient for ships with specific shapes and sizes.

Number of Airbags

The number of airbags required needs to meet the requirements of ISO 14409. It is calculated based on the weight of the ship using the formula: (where N is the number of airbags for ship - launching, K1≥1.2, Q is the ship's weight, g = 9.8, Cb is the block coefficient of the ship being launched, R is the allowable unit load - bearing capacity of the airbag, and Ld is the contact length between the ship bottom and the airbag body at the mid - ship section). For ship shifting operations, an additional 2 - 4 airbags should be prepared. The center - to - center distance between two adjacent airbags is determined by relevant formulas, which helps to ensure the proper distribution of force and the stability of the ship during the operation.

IV. Supporting Facilities

Slipway

The gradient and length of the slipway are determined according to the size of the ship and the hydrological conditions of the water area. The bearing capacity of the slipway should be at least twice the working pressure of the airbags to ensure its safety and stability during the launching process.

For ships weighing over 3000 tons and with a length exceeding 120m, the slipway should be constructed with reinforced concrete. This type of construction can withstand the large forces exerted during the launch of such large - scale ships. The height difference between the right and left sides of the slipway should be less than 20mm to ensure the smooth movement of the ship.

For ships weighing over 1000 tons but not exceeding 3000 tons, or with a length between 90m and 120m, the slipway should be made of cement concrete. This material provides sufficient strength and durability for the launching of these medium - sized ships. The height difference between the two sides should be less than 50mm.

For ships weighing no more than 1000 tons or with a length not exceeding 90m, the slipway can be an earthen slope. However, it should be compacted evenly using rollers to ensure a stable surface for the ship's movement. The height difference between the right and left sides should be less than 80mm.

The main slipway is designed to enable the ship to glide automatically when it is released from the tow. This requires careful design and construction to ensure the proper slope and surface conditions. The auxiliary slipway is determined according to the ship type, the water level at the time of launching, the diameter of the airbags, and safety requirements. It provides additional support and guidance for the ship during the launching process.

Towing Arrangement

A windlass is used to control the movement of the ship during the launching process. The towing system, which consists of a windlass, steel wire rope, and pulley set, should be firmly fastened to the ground anchor in front of the berth. This ensures the stability and safety of the towing operation.

Generally, a slow - speed windlass is selected for ship launching. The veering speed of the windlass should be within the range of 9m/min - 13m/min. This speed allows for a controlled and smooth launch of the ship. The forces exerted by the windlass and the steel wire rope need to be carefully calculated by technicians from the shipyard or the airbag company. This calculation takes into account various factors such as the weight of the ship, the friction of the slipway, and the resistance of the water, to ensure that the towing system can safely and effectively move the ship into the water.

V. Purchase Information

If these high - performance airbags meet your requirements, you are welcome to purchase or wholesale from our factory. As one of the leading manufacturers and suppliers in China, we are committed to providing you with the most competitive prices and excellent services. We have a professional team that can offer customized solutions according to your specific needs, ensuring that you get the most suitable airbags for your ship operations. Contact us today to start a successful cooperation!

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