Dual fluid LNG transferring arm

1. A LNG transferring arm, comprising:

a cylindrical support base mounted to a side of a hull;

a main body comprising a rotating structure which is rotatably provided on an upper portion of the support base;

a boom assembly comprising a longitudinal member which is connected to a side of the main body in such a way as to rotate up and down, and which is bendable at one end thereof;

a support assembly supporting the boom assembly, the support assembly being bent along with the boom assembly, being assembled by a plurality of articulation links, and being bent by a cylinder; a transfer pipe and a return pipe arranged along the boom assembly, and each having a rotary articulation, an end of each of the transfer pipe and the return pipe being connected to a tank to which LNG will be transferred;

a balance weight rotatably supported above the main body via a bracket, and hinged at one end thereof to the boom assembly, thus maintaining balance; and

rotary branch means provided in the main body, and comprising two pipes which have different diameters and are arranged concentrically, a lower portion of the rotary branch means being fixedly connected to a gas storage tank and an upper portion of the rotary branch means being rotatably branched to be connected to the transfer pipe and the return pipe.

2. The LNG transferring arm according to claim 1 , wherein the boom assembly comprises:

a main boom comprising the longitudinal member which is connected at a first end thereof to the rotating structure; and

a subsidiary boom hinged to a second end of the main boom.

3. The LNG transferring arm according to claim 2 , wherein the subsidiary boom comprises two or more subsidiary booms, and the transfer pipe and the return pipe are hinged to be integrated with the subsidiary boom.

4. The LNG transferring arm according to claim 2 , wherein the support assembly comprises:

a main support arranged to be parallel to and spaced apart from the main boom; and

a subsidiary support arranged along the subsidiary boom, the main support being connected at a first end thereof to the bracket which is secured to the main body, using the articulation links, and having at a second end thereof a rod which is slidably mounted to the main support in such a way as to extend, with an end of the rod being hinged to the subsidiary support.

5. The LNG transferring arm according to claim 1 , wherein the rotary branch means comprises:

a dual supporting concentric pipe comprising a first pipe having a small diameter and a second pipe having a large diameter, one end of the dual supporting concentric pipe being connected to the gas storage tank;

a dual rotating concentric pipe rotatably coupled to an upper portion of the dual supporting concentric pipe via a bearing, and comprising a third pipe and a fourth pipe which have the same diameters as the first pipe and the second pipe; and

a dual branch pipe integrally coupled to an upper portion of the dual rotating concentric pipe, and having a fifth pipe and a sixth pipe which are concentrically connected to the third pipe and the fourth pipe, one end of the fifth pipe with a small diameter passing through one end of the sixth pipe with a large diameter to extend to an outside.

6. The LNG transferring arm according to claim 1 , wherein each of the transfer pipe and the return pipe is provided with extension pipes which are extendable to a predetermined distance.

7. The LNG transferring arm according to claim 1 , wherein the support assembly comprises:

a main support arranged to be parallel to and spaced apart from the main boom; and

a subsidiary support arranged along the subsidiary boom, the main support being connected at a first end thereof to the bracket which is secured to the main body, using the articulation links, and having at a second end thereof a rod which is slidably mounted to the main support in such a way as to extend, with an end of the rod being hinged to the subsidiary support.