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Tunnel project U3, Munich

The project:


Construction of underground tunnel line 3 North, lot 1

Execution companies:

Consortium U-Bahn Linie 3 Nord

Ed. Züblin AG, Ndl. Tunnelbau

Ed. Züblin AG, Ndl. München


The problem:


Pumping off the water arising during mined underground tunnel heading.


Our solution:


Use of 9 submersible waste water pumps of Type KTZ32.2.

Because of the highly calcareous water deposits occur in the pump hydraulics resulting in pump blocking. However, due to the mechanical seal positioned completely inside und the additional shaft protection sleeve with sealing ring the pump can be put quickly with little effort and without exchanging any wear parts back into operation again.

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.