METHOD FOR SETTING NATURAL FREQUENCY OF PIPE TOWER OF LIQUID CARGO TANK FOR VESSEL AND ITS STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a method for setting a natural frequency of a pipe tower of a liquid cargo tank for a vessel, capable of minimizing design change to set the natural frequency of the pipe tower at a preferable value in response to change of the size of the liquid cargo tank mounted on the vessel and of promptly responding to the size change.;SOLUTION: Inside the liquid cargo tank 1 mounted on the vessel, the pipe tower 4 extending from the upper part to the lower part of the liquid cargo tank 1 is provided. A lower cylindrical part 9 having a diameter larger than the outer diameter of the pipe tower 4 and formed by a side plate and an upper plate is provided at the lower end of the pipe tower 4. Due to adjustment of the size of the lower cylindrical part 9, a joint part 13 of the side plate and upper plate of the lower cylindrical part 9 can be regarded as a lower vibration base point of the pipe tower 4.;COPYRIGHT: (C)2008,JPO&INPIT