Inflatable Air Bags For Boats

Professional Team
Shanghai Mountains located in Shanghai, China is a leading manufacturer and supplier of rubber fenders for decades, offering a wide range of popular products.

Complete Range of Products
We provide an extensive range of the most popular products, including arch fenders, cone fenders, cylindrical fenders, inflatable fenders, air bags, super honeycomb fenders, and tugboat rubber fenders.

Rich Experience
With approximately 10 years of production and experience and steady development, in addition to the current product line, we can also design new molds of new-style products for you based on the drawings or requirements.

Overseas Market
Shanghai Mountains rubber products have been exported to dozens of countries, such as Australia, Singapore, the Philippines, Indonesia, Saudi Arabia, Malaysia, Nigeria, Panama, Lithuania etc.

Inflatable air bags for boats are to be constructed of an out rubber layer, multilayer heavy-duty synthetic-tire-cord layers, and an inner rubber layer vulcanized firmly. Inflatable air bags 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 inflatable air bags 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 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 inflatable air bags. 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.

The inflatable air bag for boats is easy to be used, convenient and durable, and is soft and can fold, curly, contraction when it isn't inflate, it have the enough strength to withstand the pressure of concrete when it is inflated, this is incomparable with any traditional template. It is suitable for pumping holes in reinforced concrete components, including piles, roof trusses, roof panel columns, beams, construction projects, water conservancy projects (docks, slipways, wharves).

● The design of marine airbags is scientific and reasonable. The prefabricated or cast-in-place finished components can meet the design requirements, and the operation is simple, labor-saving, time-saving and material-saving.

● The marine airbag has good aging resistance and long service life. This product is made of synthetic rubber, natural rubber and reinforced layer after vulcanization. It has good anti-expansion strength, elasticity and flexibility, so it can be used under various working conditions.

● The applicable temperature of marine airbags is widely in the range of -10℃～+90℃, and the material does not change.

● Marine airbags provide favorable conditions for lightweight construction on the construction site. The prestressed hollow concrete components are 20% lighter than non-prestressed solid components due to the use of marine launching airbags. Therefore, reducing the weight of the upper structure of the building can make piles The foundation is shortened, and the on-site construction is simple and safe.

● Type of ship
● LOA length of the ship
● The width of the ship
● DWT of the ship
● The angle of the ship launching ramp and the ground material
● Tide table, water depth, and flow velocity information of the launching sea area
For concrete ramps, the friction coefficient of the airbag to the ramp is 0.01-0.0125. For compacted natural foundations, the coefficient is 0.0125-0.02.
Where N is the required number of airbags, K1 is the airbag coefficient, Q is the weight of the ship, g is the acceleration of gravity, Cb is the square coefficient of the ship, R is the maximum bearing capacity of the airbag per meter, and Ld is the contact length of the airbag with the bottom of the ship Value (m).
With this formula, you can also perform a calculation by yourself after accepting the selection recommendation to see if the number of airbags recommended by the other party is reasonable. However, it should be noted that when the ship moves, 2~4 redundant airbags should be prepared.

Set up a holding system
Before launching, the vessel needs to be held in position by a holding system. For the large ship, it is better to use ground anchors, winches, wire ropes, and pulleys. For the small ship, the shipyard can use a crawler crane to control for easier operation.

Inflate launching inflatable air bags for boats to lift the hull
Insert the ship launching inflatable air bags between keel blocks. Then, inflating launching inflatable air bags to the jack-up vessel. With the continuous expansion of the launching inflatable air bag, the entire hull is slowly supported by the inflatable air bag. Generally, the vessel will be lifted up from one end to another, step by step. Once the vessel bottom leaves from support blocks, those blocks will be removed. At this time, the entire weight of the hull is distributed on multiple inflatable air bags. So created the conditions for dismantling the shipbuilding and laying aside the pier.

Clear the ship launching platform
Treatment of site flatness, the flatness of the ground should be ensured as far as possible on the launching slope. If there are pits, they must be filled with bagged sand. If there are obvious protrusions, they should be flattened, and the bottom of the ship should be cleared the ship passing by all the debris and obstacles that hinder the rolling of the ship launching inflatable air bags on all the fields.

Adjusting launching inflatable air bags for boats
That adjustment includes adjusting inflatable air bag pressure and vessel position. Sometimes vessel is built far away from the water. So have to move down on the slipway before launching. Pressures of ship launching inflatable air bags need to be adjusted before the final launching according to practical conditions and the launching calculation.

Release the winch let the ship move into the water
Arrange mooring ropes on both sides of the ship. The ropes must meet the requirements of traction and must be introduced from the bow, tied to strong ground components such as bollards, and part or all of the hull can be tied if necessary.
Remove all the piers under the ship, start the auto-release hooks, or cut the holding wire rope, and make the ship move into the water area with the help of the rolling rubber inflatable air bag. If the water area is limited, people can use the control launching, releasing winch ropes to let vessels roll down into the water slowly.

Launch the ship and recover the inflatable air bag for boats
The ship is successfully launched, drag the ship to the dock, and recover all rubber inflatable air bags, measure the ship's bow and stern draft, and check whether there is any water leakage in each cabin.

Step one: Making rubber sheets for different layers of airbags.
Step two: Using coating calender to combine framework material with rubbers sheets then get the sheets called cords fabrics.
Step three: Forming. To make cords fabrics into airbags, there are two kinds of methods:
Outdated one is sticking method. As the name indicates, all layers are sticking together like sticking a pillow. The connection of airbag body and two coned ends is weakest part of such airbags. Producing airbags by sticking method saves time and material thus some airbag factories are still using it.
The mainstream of airbag producing method is enlacing technique. Layers are enlaced with a cross angle, between layers chemical are coated to enhance the bond. Airbags produced by this technique have better performance and safety compared with those made by sticking method.
Step four: Vulcanization
When airbags forming is completed , airbags will be transported into vulcanizing tank for curing. After vulcanization airbags are ready for use.