Ingenious launch for a DWT20000 vessel
People who is familiar to airbag ship launching technology may know that in most cases there will be pulling system to prevent vessels from slipping before launch. But if the pulling system is not available due to practical limitation, can people launch vessels with marine airbags? The answer is yes.
In low tide period, the mud of riverside was cleaned by excavator grab and some sand bags were placed to fulfill pits on the riverbed. To jack up vessel marine airbags at the stern were fully inflated and airbags at the bow only partly inflated, After the ship was totally lifted, people removed support blocks and adjust the ship to be slightly retroverted to ensure its safety.
In high tide period, when water reached schedule one height marine airbags were adjusted carefully to low down the stern. As the water level went higher, people began to inflate airbags at the bow to make the ship tilt forward but not exceed the angle of 0.008 radian. When the water reached the scheduled launch level, an excavator grab began to push the bulbous bow to give vessel a start force. When ship get a obliquely upward push force its tilt angle will easily exceed the 0.008 radian because of the flexibility of marine airbags,.Then ship started to slowly moved and went into the water smoothly with rolling airbags.
The flexibility of marine airbags can remedy the practical limitations in some projects. By adjusting working pressure of marine airbags people can adjust ship’s tilted angle according to the need. If people want to get a bigger slip force they can lower the stern and lift the bow by giving different inner pressure to airbags. On the contrast If the angle of ramp is fairly big, people may do the reverse to reduce the slip force. The convenience and flexibility make marine airbags become the powerful tool for many engineering projects such as ship launching, landing, salvage, heavy conveying ,etc.
News from : http://www.eversafe-marine.com/media_details.aspx?cid=1&id=108