Hitachi Plant Technologies, Ltd.

Hideki Akiniwa

Minoru Hiroshima

Hiroaki Yoda

Tomohiro Naruse

According to the present invention, along the right and left sides of a rotary shaft, flat faces that serve as sealing faces are formed at the circumferential edges, on the suction chamber side, of semicircular division plates, which define suction chambers and a discharge chamber of a volute casing that is divided into two segments. Two disc plates are prepared as pressure test tools, and are positioned on the right and left sides of the rotary shaft so that they contact the flat faces that are formed around the circumferential edges of the division plates near the suction chambers. The two disc plates are then securely connected to a member in the axial direction. In addition, a bolt fastening structure, which is axially tightened by the member that connects the disc plates axially, is provided in at least one axial direction.

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Tsuchiura, Japan

Hideki Akiniwa