High Strength Marine Lifting Air Bag
Brief Introduction
Marine Lifting Air Bag for ship launching and docking have the best designed structure which consists of five different functional membranes in rubber layers.
1) Outer Rubber Layer
The outer rubber layer that covers the outside of marine lifting air bag to protect under layers from abrasion and other external forces. This compound has sufficient tensile and tearing strength to withstand any condition and hard usage.
2) Inner Rubber Layer
The inner rubber layer seals pressurized air inside marine air bags.
3) Synthetic-Tire-Cord Layer as Reinforcement
The reinforcement cord layers, which are made of synthetic-tire-cord commonly used in tires, are arranged at ideal angles to hold the internal pressure and distribute stress evenly. So they can provide strong efficient reinforcement.
Features of Marine Lifting Air Bag
1. long lifespan
2. movable and reusable
3. saving investment costs
4. saving labor and time
Various sizes of marine air bags can be produced:
Marine air bags can be manufactures as per customer's request as per the launching conditions:
Diameter: 1.0m, 1.2m, 1.5m, 1.8m, 2.0m, 2.5m
Effective Length: 6m to 24m
Layers of rubber of fabric cord: 4 layers to 10 layers
Performance Calculation Principle of Air bags
The bearing capacity of marine air bags was 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 marine airbag the contact area will be affected by some terms which include the carried ship condition, the different position from gravity center during the process of ship launching and pulling. So the bearing capacity of airbags will vary as well as the contact area.
The approximate bearing capacity can be calculated as follows:
F=PS
S=π x (D1-D2)/2
Mark:
F: Bearing capacity
P: Inner pressure
S: Contact area
D1: Diameter of airbags when free of loat
D2: Working height of airbags when loaded
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