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Understanding API ICP653 Reading 7-Worksheet-04 Part1

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12.5 Measured Settlement (During Hydro)<br />

12.5.1.1 When settlement is anticipated, the tank being hydrotested must<br />

have a settlement survey.<br />

12.5.1.2 Initial Settlement Survey:<br />

With tank empty, using the number of bottom plate projections as elevation<br />

measuring points (N), uniformly distributed around the circumference.<br />

FORMULA:<br />

N=D/10<br />

Where:<br />

a. N = minimum number of measurement points (not less than 8). The<br />

Maximum spacing between measurement points shall be 32 feet.<br />

b. D = tank diameter (in feet).<br />

NOTE: See Appendix B for evaluation and acceptance.<br />

Charlie Chong/ Fion Zhang

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