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Apr 14

Recently we are studying microtunneling slurry separation system. This is a new project for GN solids control, but the work principle is similar to the slurry separation system used for other project. Our rich experience of design and manufacture help us a lot in the study.

Definition and History

Microtunneling is a process that uses a remotely controlled Microtunnel Boring Machine (MTBM) combined with the pipe jacking technique to directly install product pipelines underground in a single pass. This process avoids the need to have long stretches of open trench for pipe laying, which causes extreme disruption to the community. In the U.S., microtunneling has been used to install pipe from twelve inches to twelve feet in diameter. Therefore, the definition for microtunneling in the U.S. does not necessarily include size. Microtunneling has evolved in the US to describe a tunneling process where the workforce does not routinely work in the tunnel. Microtunneling is currently the most accurate pipeline installation method. Line and grade tolerances of one inch are the microtunneling industry standard. This can be extremely important when trying to install a new pipeline in an area where a maze of underground utility lines already exists.

Microtunneling was developed by the Japanese in the early 1970’s to replace open sewers in urban areas with underground gravity sewers. The first microtunneling project in the U.S. occurred in south Florida in 1984.This was a 600 foot crossing with 72″ pipe under I 95 and the FEC Railroad. Although originally designed for gravity sewer construction, microtunneling installations include underground crossings of highways, railroads, runways, rivers, and environmentally sensitive areas for a variety of utilities. This process has also been used to install plant intakes and outfalls. Microtunneling is also used in the pipe arch technique of supporting large underground openings with an arch or roof made up of small tunnels

As the name implies, microtunneling is used to construct small tunnels. These small diameter tunnels make it impossible to have an operator in the machine itself. Instead, the microtunnel boring machine or MTBM must be operated remotely. Usually the operator controls the machine from a control room on the surface of the ground. The operator is given constant feedback about the machine’s location, orientation and hydraulic devices via a computer console. Most machines also have video cameras set up to give the operator more information. The operator can then control the MTBM and the jacking frame from the safety of the control room.

Although the above requirement takes the microtunneling design for reference, but GN chief engineer has his own opinion. If our design can reach the same target, no matter what model/brand equipment we use in the system. So we take the treating capacity and tank capacity as the main parameter, use our GN solids control equipment to assemble a complete set slurry separation system. After adjustment, we thought the target has reached our as-designed configuration.

 For further infomation, pls contact GN solids control.

written by GN Desander Desilter \\ tags: , ,


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