Risks analysis of ship launching with air bags
Accordng to the investigation result, more than 80 percent airbag ship launch accidents happened due to bad preparation work.The main factors that cause launching accidents are launch ramp, water level and holding system.
Nowadays ship launching with airbags is not novelty. Estimated in China every years there are about 200 vessels have been launched with airbags. Airbag ship launching technology is simple and practical, it can save much money and time. Even recent years shipbuilding market is depressed, it is still booming.
But what is the risks of ship launching with airbags? What is the good ship launching and bad ship launching? When your vessel rolls into water and floats successfully it means you complete a good ship launching, is it true?
Ship launching accidents are easy to find no matter by what method the ship is launched. Dry dock ship launching is considered as the most safe launching way but a shipbuilding company in China sunk three ships when launched them with floating dry docks. So treat ship launching seriously is the first thing we need to do.
The technique of ship launching with airbags is simple but it still needs good preparation. Launching ramp is the most easy to be neglected one for airbag ship launching. Some people may say, does balloon ship launching need prepared ramp? Yes, it needs , maybe not concrete ramp but a compacted neat launch ramp is surely needed.
In some reckless ship launching projects. those launch ramp is only a hill of rubbish, full of stones and steel bar on which balloons can only roll stumblingly and easily to be cut through. At last the bow collide with the hill even there are balloons cushion under it. Forget the possibility of bending moment caused hull damage during the launch, they would not care.
Source from: http://eversafe-marine.com/technology.aspx?cid=71