As-built work is done the way it was a hundred years ago when the first refinery was due for its first update. A pair of designers would go onsite armed with tape measures, plumb bobs, pens and pad and, by hand, measure the area to be modified.
The tape measure is still used, but it is augmented by handheld laser measuring devices that deliver ultra accurate linear dimensions. The laser tracker also makes 3D measurements faster, providing up to 10,000 observations per second, within 1/1000th in. for excellent statistical redundancy and repeatability.
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