Osaka Gas Company Limited

Hirofumi Ueda

Hiroyuki Nishimura

Shinichi Kawasaki

Hiroaki Zaima

Yuji Higuchi

Koichi Sumida

Hiroyuki Maeba

Takayuki Shimokawatoko

Shiro Sakai

The present invention provides a technique for joining polyolefin pipes by means of a polyolefin joint, the method comprising the steps of placing a treatment containing a silicon compound or a treatment containing a silicon compound and a reaction accelerator between the pipes and the joint and heating a joining portion.

Method for joining polyolefin pipes and treatment for the joining

A method, an apparatus, and an integrated system using the apparatus for measuring a concentration of odorant in odorized gas which is produced by adding the odorant to un-odorized gas comprised mainly of hydrocarbon gas. In a detection absorbance measuring step, there is obtaining detection odorized gas absorbance which is absorbance of the odorized gas relative to a detecting ultraviolet light having high absorbability to the odorant and low absorbability to the un-odorized gas. In a subsequent concentration deriving step, the odorant concentration in the odorized gas is derived from the detection odorized gas absorbance.

Method and apparatus for measuring odorant concentration and oderant

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Takarazuka, Japan

Hirofumi Ueda