Lotowater Technical Services Well Inspection
2G Robotics’ underwater laser scanner enabled Lotowater Technical Services to accurately assess the current state of a submerged well pump.
Lotowater Technical Services wanted to design a custom tool to remove a 20 year old pump from the bottom of a well located at the Cambridge Water Treatment Facility. Additionally, a liner had been installed above the pump and there was concern about the ability to extract the section of interest through the liner. As such, measurements were required to determine the pipe diameter at the top of the pump assembly in order to design the tool to the right specifications. Lotowater requested to use a 2G Robotics ULS-100 underwater laser scanner in order to obtain the diameter of the pump assembly.
The well had an initial diameter of approximately 350mm which steps up to 550mm prior to the depth of the pump. The pump was fully submerged and located at a depth of approximately 44m from the top of the well. The desired scan area was approximately 250mm in diameter.
The ULS-100 emits a laser plane with a 50 degree swath which projects a laser line on the target surface. The optical sensor measures the angles that laser light scatters back to the scanner and uses this information to calculate x, y, z coordinates of 480 points along the laser line. The scanner head is then rotated and an adjacent profile of points along the laser line is captured. By repeating this process the ULS-100 produces a 3D point cloud representation of the object being scanned. The ULS-100 is capable of 360 degree rotation which makes it ideal for profiling the inside of wells, pipes, and shafts. The scanner was therefore lowered into the well at known distances to capture segments of the well. These segments could then be stitched together to get comprehensive information regarding the well’s structure.
The ULS-100 generated a true-scale 3D point cloud of the current condition of the well, pump and liner. From this point cloud, measurements could be taken to accurately assess the requirements for the tool to be built. Precise requirements could be modeled and the laser data provided confidence in the investment in the project.