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Bottom elevation measurement

Bottom elevation measurement

(OP)
Hello dear colleagues, this is an extract of API 650 2013 " 7.3.6.8 Internal bottom elevation measurements shall be made before and after hydrostatic testing. Measurements

shall be made at maximum intervals of 3 m (10 ft) measured on diametrical lines across the tank. The diametrical

lines shall be spaced at equal angles, with a maximum separation measured at the tank circumference of 10 m (32 ft).

A minimum of four diametrical lines shall be used.
"; I ask, Can we use it for measure the bottom flatness?, it doesn't mention any tolerance, is there any tolerance that can I use for reference?

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