Is channel operation restricted by the installation of FAST?
The channel cleaning using high pressure at 120 bar can be continued safely. Testings have been successfully applied by a renowned German university institute.


Does high-pressure cleaning of channels affect data transmission in the fiber optic cables?
The data transmission in fiber optic cables takes place at light speed. Any mechanical vibrations that may occur have an amplitude frequency speed of only a fraction of speed of data transmission. Data transfer is therefore not affected.


Where are the empty conduits in the cross sectional flow?
In the apex, usually at 11 to 13 h.


Is there any hydraulic influence on channel cross section?
Ein Kabelleerrohr mit Durchmesser von 11,5 mm hat eine Querschnittsfläche von 1,0 * 10-4 An empty cable tube with a diameter of 11.5 mm has a cross-section of 1.0 * 10-4 m2 (0.000104), an empty cable tube with a diameter of 15.5 mm a cross-section of 1.9 * 10-4 m2 (0.000189).
In addition, the mounting rings arranged at intervals with a thickness of 0.5 – 1.0 mm (rotating) and a turnbuckle with a cross section of 9.0 * 10-4 m2 (0.0009 ).

Depending on the channel dimension and the number of tubes, usually reduction of cross-section results in less than 3% of the flow cross-section. For this reason, it is negligible in most cases. If necessary, the appropriate values are accurately proven.


Are cable tubes and mounting rings damaged by high-pressure flushing?
All materials used are made of high quality V4A. Several tests by a renowned German university institute have been successfully carried out and documented, with no damage to the system found.


Can mounting rings displace in the channel?
The rings are made specifically for each channel diameter and are firmly braced against the channel wall by hydraulic robots without suffering any damage. Each ring is mounted close-fit to the channel wall and cannot be displaced because the sitting in infinitely fixable spring assembly prevents a relaxation of tension.

Can it happen that a mounting ring or a cable pipe covers an intake?
Prior to installation the state of a channel is documented, based on which an installation plan is developed. In this plan, the locations of mounting rings and the course of the FAST-cable tubes are determined. Thus, a cover of intakes is avoided.


Can cable tubes fall out from the mounting rings?
The tubes are held by clips with barbs in the mounting rings, so that a simple fall out or break is impossible.


Is the channel damaged by the use of the FAST technology?
For diameters DN 200 to DN 700, the cable tubes are held by circular mounting rings braced against the channel wall. No damage happen through drilling.

From DN 800, the sewers are usually made of concrete or masonry. Both construction methods have significantly thicker wall than the other pipe materials.

From these diameters on, partial mounting rings are used for fixing the cable tubes. These will be pegged 2 cm deep in the channel wall with slot-and-wedge bolts.


Can the FAST technology dismantled without damage?
Analogous to the installation, the FAST can be dismantled in non-accessible area by the use of the FAST-Robots. The walk-through area that is also easy to incorporate handwritten decommissioning.


How does the use of FAST technology for sewer rehabilitation?
Basically, it is advantageous if the schadfrei for the transfer of FAST channel is provided with the appropriate requirements or will be renovated before.

Is a canal clean up after the installation of FAST, there are several possibilities. Repair (eg Robotics), Restoration (eg, pipe lining) may also be continued trenches. The various claims for damages and technology based approaches can be provided with the appropriate requirements.