Mitsubishi Shipbuilding Co., Ltd.

Mitsubishi Heavy Industries Limited

Michihisa Watanabe

Kazuhiro Hirota

Satoshi Miyazaki

Kazuhiro Miura

Takashi Okafuji

Ryusuke Takada

Hirotomo Ohtsuka

The present invention provides a control device that includes a first temperature detection unit that detects a partition wall temperature of a tank main body in which liquefied gas is contained, and a second temperature detection unit that detects a temperature of a skirt that supports the tank main body. The control device further includes a temperature difference acquisition unit that acquires a temperature difference between the partition wall temperature detected by the first temperature detection unit and the temperature of the skirt which is detected by the second temperature detection unit, and a determination unit that determines whether or not a joint between the tank main body and the skirt is rapidly cooled by the liquefied gas on the basis of the partition wall temperature and the temperature difference.

Liquefied gas-based rapid cooling possibility determination device, liquefied gas storage tank, liquefied gas carrying vessel, and liquefied gas-based rapid cooling possibility determination method

To provide a non-spherical tank which includes: a circular cylindrical portion; a top portion disposed continuously with an upper side of the circular cylindrical portion; and a bottom portion disposed continuously with a lower side of the circular cylindrical portion, wherein the top portion includes: a spherical shell portion which is formed of a portion of a spherical body having a radius R, and is disposed at an upper end of the top portion; and a toroidal portion which is disposed continuously with the upper side of the circular cylindrical portion and with a lower side of the spherical shell portion respectively, and is formed of a portion of a spherical body having a radius Rsmaller than the radius R, and an expression 1.0&#x3c;R/H&#x3c;1.5 is satisfied. Here, 'R' denotes a radius of the circular cylindrical portion, and 'H' denotes a height of the top portion in a vertical direction.

Non-spherical tank and liquefied gas carrier ship equipped with the non-spherical tanks

Provided is an independent tank, and a manufacturing method therefor, for which local bending stress occurring on the vicinity of a boundary portion (welded portion) can be reduced without increasing plate thickness. An independent tank has at least one curvature change portion in which the curvature along the axial direction of plate members that form the tank changes along the axial direction. Both the inner peripheral surface and the outer peripheral surface of the plate member on the small curvature side are not flush with respect to the inner peripheral surface and the outer peripheral surface of the plate member on the large curvature side. The plate thickness center of the plate member on the small curvature side is offset toward the radial direction inner side or the radial direction outer side with respect to the plate thickness center of the plate on the large curvature side.

Independent tank with curvature change section, and manufacturing method for independent tank

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Tokyo, Japan

Michihisa Watanabe