360o HD CCTV INTERACTIVE IMAGERY LINKS
- Gate Valve Corroded
- Damaged and Missing Cement Mortar
- Cross Fitting Section with Noted Defects
- 42″ Steel Raw Water – Inline Tool – Corrosion
- 66″ Potable Water Main – Coating Delamination
- 66″ Potable Water – Damaged & Blistered Coating
- Laser Profilometry Setup – 66″ Pipe
- Cracked Lining on Pipe Wall
- 36″ Steel Pipe – Inline Configuration RAFT at 90-degree Elbow
Light detection and ranging (LiDAR) has similar capabilities to laser profiling but is a superior technology in many respects. LiDAR can also be deployed as a stand-alone inspection tool or added to a high-resolution inspection platform. The basis of the technology is “time of flight ranging,” where a focused beam of coherent or pulsed radiation is transmitted out, and that radiation then reflects off the target surface and returns back to the receiver. PICA’s system uses Laser Triangulation Ranging, where the receiver measures the angle at which the transmitted radiation hits the receiver; the distance is then calculated using trigonometry.
LiDAR is highly accurate over long distances and is commonly used to map topography from aircraft or space or to measure inside buildings. PICA’s LiDAR unit is typically an add-on for our RFT tools to supplement the RFT capabilities. Our system collects 4,000 points per second. Each data point consists of a time stamp, an absolute rotation angle, and a distance value. By cross-referencing the LiDAR data points with the odometers on the RFT tool, we can map out the inner surface of the pipeline.
APPLICATIONS & CAPABILITIES
- The pipe must be dewatered.
- LiDAR can be used on any pipe material and any pipe diameter, as the unit is centered inside the pipe.
- LiDAR produces a 3D model of the pipe interior.
- LiDAR is especially useful to document liner integrity when numerous lining cracks and/or spalling of cement mortar liner are present (potential locations of cylinder corrosion), as it is time-consuming to hand-document multiple defect locations.
- LiDAR can be added to the NFT and RFT tool platforms and can be used in combination with CCTV to validate NFT and RFT electromagnetic inspection results and to document current conditions that can later be compared with results and observations in future inspections.