Direct Pipe Jemgum
Germany, Emden

By the Ems River near Leer (Germany) an underground natural gas cavern is being built. For this purpose, salt domes are leached until large cavities are created and a 42-kilometer-long pipeline to the Outer Ems will be laid in order to dispose of the salt water (brine) - 283 meters of which will be laid by using the new one-step Direct Pipe® method from Herrenknecht near "Rysumer Nacken".

The innovative Direct Pipe® method allows to reduce the impact on the sensitive East Friesian Wadden Sea area to a minimum. In contrast to conventional pipelaying technology time and labor-intensive sheet pile wall constructions along the offshore pipeline route can be avoided using Direct Pipe® . The prefabricated pipe string will be pushed directly toward the outfall structure in the Outer Ems. Parallel to pipe thrusting a micromachine - coupled to the pipestring - excavates the soil. After completion of the microtunnelling operations the machine is uncoupled from the pipestring and recovered. During this project, Direct Pipe® has convinced the customer  in terms of profitability and eco-friendliness. The one-step method has also contributed greatly to safeguard future natural gas supplies.

Data Sheet

Country, Location

Germany, Emden




Brine outlet


Soft ground
Sand, silt, clay, gravel, wood, stones

Tunnelling length

283 m

Machine Data

1x Direct Pipe:
Diameter: 1,295 mm
Lining method: Pipeline
Push force Pipe Thruster: 500 t
Torque: 150 kNm

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.