The release of the ASTM F3080 provides engineers, inspectors and authorities with an internationally accepted procedure for the measurement and/or confirming of installed pipe size and/or shape deformation.
The F3080 – 14 Standard incorporates a 360-degree, non-rotating laser light ring projected onto the interior surface of a pipe or drainage structure. The narrow laser ring of light conforms to the true and existing internal shape, regardless of that shape. Each laser image is captured and recorded using a CCTV color pipeline inspection system with video recorder as the CCTV camera with laser projector, moves through the line.
The recorded inspection image data is moved to a computer where machine vision programs and algorithms are used to process each video image (30 frames per second NTSC, 25 frames per second PAL).
The processing software generates the center of each video image, performs and stores 1,080 radia
l measurements per image. Using this radial data, multiple reports can be generated, viewed and printed. Reports can include Ovality, True Diameter, X-Y Diameter, Capacity, and 3D Modeling. Manual measurements can also be performed on any individual image. Manual measurements may include water level, debris level, joint gap and deformation.
To confirm accuracy, a match to reference image is provided on each survey. The “match to reference image” is generated from two independent data files. Image one is generated solely from the alpha numeric insertion of pipe shape and diameter. Image two is generated solely from the software processed laser measurement data. The images must match and overlay each other for “accuracy of survey” confirmation.