MAPPING & MODELLING
Gyroscopic modelling goes underground
A unique pipeline-mapping technique could revolutionise assessments of under-the-surface assets, says David Pitt, managing director of Infotec
or many years, pipeline tracking and mapping has been considered an inexact science, with positional accuracy doubted and depth indication unreliable. The reliance on surface-traced probe or sonde positions has resulted from an absence of a real alternative. Ground-penetrating radar rarely provide reliable
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results, due to either a lack of effective penetration or inadequate resolution. Electromagnetic tracing techniques are also frequently affected by the electromagnetic fields distorted around other conductor utilities such as electricity cables. PipeTrack 3D provides guaranteed accuracy and is unaffected by either depth or adjacent or surface electromagnetic distortion or interference. It is the UK’s only inertial gyroscopic pipeline mapping system and is operated by specialist underground utility mapping company Infotec.
PipeTrack 3D is a self-contained mapping pig
that provides route and longitudinal profile or level, without surface-level tracing and no costly traffic and high-risk surface-level tracking. After each pass, the unit performs integral
quality control checks providing the operator with an accuracy report. On completion, the data is downloaded, processed and converted to CAD, GIS, or both, to suit the client’s requirement. Longitudinal sections can be analysed using
CAD to provide an instant indication of high spots, low spots, negative gradients or areas of likely failure. Virtually all surveys are undertaken with CCTV enabling internal condition survey to be matched with accurate positional data. For the first time, 3D coordinates will be
available for new drainage connections to be accurately designed and laid. Also, defective pipe
Pipetrack 3D provides accuracy without surface-level tracing
routes can be accurately determined, avoiding any unnecessary work and improving performance. PipeTrack 3D is being used to provide the
depth of cover or clearance over existing or proposed structures on projects, such as new rail extensions. The accuracy and reliability of the surveys enables movement monitoring during major excavation works or soil-stabilisation projects undertaken in close proximity to underground utilities or structures. There is no longer a practical alternative to
PipeTrack 3D. Speed, accuracy, reliability and costs are all benefits achieved using this revolutionary system. Equally at home in pipes large or small, and with so many potential applications, gyroscopic mapping is set to change the methods used for mapping underground plant for years to come. ■■■
May 2010 Water & Wastewater Treatment 29
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