Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Yasuharu Chuman

Toshiyuki Yamashita

Shuji Tanigawa

Nobuhiko Nishimura

Daigo Watanabe

Atsushi Yuge

Ryo Nakamura

Masaaki Fujita

Takumi Tokiyoshi

Shuichi Kawasaki

Yuta Takahashi

Tatsuya Kameyama

Hiroyuki Arakawa

Yuichi Kanemaki

Ryuhei Takashima

Fumitoshi Sakata

Shintaro Matsumoto

Hiroyuki Ohyama

Takanobu Kamiya

Masafumi Yamauchi

Masahiro Umata

Kenji Nakamichi

Ichiro Ohtsu

Takashi Maemura

Taiji Tezuka

Yoshitaka Nakayama

Takuya Fukahori

Takafumi Shinogi

Ichirou Takeno

A cooling channel structure includes a tubular member with openings at both ends. In an inner portion of the tubular member or on a surface of the tubular member, as cooling channels for a cooling medium for cooling the tubular member, spiral outer surface-side channels are located on an outer surface side of the tubular member, at least one inner surface-side channel is located on an inner surface side of the tubular member, and folded channels, respectively, connect the outer surface-side channels and the at least one inner surface-side channel on one end side of the tubular member.

Cooling channel structure and burner

A method of extending a life expectancy of a high-temperature piping, includes removing a heat insulation material which covers the piping having a high creep rupture risk, and lowering an outer surface temperature of piping, wherein a width of an exposed portion obtained is twice or more a distance from a peeled-off end portion of the exposed portion to a portion where a compressive stress is asymptotical to 0 after a change in stress between a tensile stress and the compressive stress occurring in the piping due to the removal of the heat insulation material is made from the tensile stress to the compressive stress, and the distance is calculated based on the following formulae, &#x3b2;x=5, here, &#x3bd; is a Poisson's ratio, a is an average radius of the piping, and h is a plate thickness of the piping.

Method of extending life expectancy of high-temperature piping and life expectancy extension structure of high-temperature piping

A method and apparatus for monitoring crack inside piping suitable for high temperature environment including an electrode attachment process for attaching a pair of heat resistant current input-output electrodes to an outer circumferential surface of the piping such that the crack is positioned between electrodes. Measuring intra-crack potential difference by a pair of heat resistant potential difference measuring electrodes attached to outer circumferential surface of the piping and placed between the input output electrodes by supplying alternating current between the input-output electrodes. Crack length is calculated from the measured electric potential difference after correcting the intra-crack electric potential difference as a function pipe temperature and pressure by an intra-crack electrode potential difference correction process.

Crack monitoring method and apparatus

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Tokyo, Japan

Yasuharu Chuman