Study On The Longitudinal Slipway Launch Of 37420 DWT Vessel

Shanghai Shipyard had an order of two new shipbuilding of 37420 DWT multiple purpose container ships and they are to be built on NO. 2 Slipway. Since the wide of Huangpu River and the breadth of the slipway are quite limited , the preventive measures are necessary to keep away from the ship touching up with the slipway and the ship collision with the opposite shore , except for the normal problems may happen during the launching. For the former reason, the low tidal level and low currentvelocity are prevailed while the high tidel level and high currentvelocity are favorable for the later one.In this paper, the proper proposal is given for the ship launching. It not only makes sure for the ship safety, but also reduces the ship rotation in the time from the ship aft floating to whole ship folating during the ship launch, as well as preventing the ship" impact with the slipway. At the same time, the necessary measures are taken to ?turn the ship direction in the center of the river with no collision., with the opposite shore.Based on the static calcuation, it gives the conventional conditions of the normal longitudinal slipway launching, such as the weight, gravity center and tidel level, etc. Furthermore, it estimates the required tidal level and current velocity according to the-ship direction rotation during the launching. Finally it brings us the best launching conditions for this ship. In addition, we install anti-impact device and mid-ship anchor in order to no risk condition of accidence. However, the first ship was launched on 30/08/2001, neither any ship touching with the slipway nor the ship collision with the opposite shore and it made a very .successful end of the vessel erection on the shlipway.