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Marmaray Undersea Tunnel, Turkey

The project:


Construction of a railway tunnel under the Bosporus


Executing company:

Taisei Corporation, Japan


The problem:


Construction of a multi-track rail tunnel under the ocean floor to join the two continents. Dewatering the site and keeping it dry during the construction period.


Our solution:


To dewater the site, 14 KTZ pumps and 16 LB pumps were employed in constant use. Due to their robust cast iron design, KTZ pumps are particularly suited for use on tunnel construction sites. The LB pumps are light, single-phase pumps for emergency use.

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In the event of abrasive and corrosive utilization, stronger wear and tear will take place naturally in certain components. With regards to the above application wear and tear can take place mainly in impeller, agitator, suction plate, shaft sleeve, oil ring, mechanical seal, pump casing, strainer, motor casing and discharge coupling. Depending on the working conditions the lifetime of those parts might vary significantly and can be shorter than the legal warranty period.
In this regard, please pay attention to our general terms and conditions that we also send to you by mail on request.