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CCP 01-23-2006
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CCP 01-23-2006
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5/8/2007 1:21:14 PM
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11/14/2006 4:41:45 PM
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The safety, sanitary, structural and sound design and operational deficiencies <br />noted above are not intended to be a complete list of the deficiencies on this tank. The <br />complete report and accompanying photographs should be reviewed to obtain a complete <br />account of the condition and the deficiencies of this tank. This inspection did not include <br />the review of the original design documents nor was the tank condition compared to the <br />current wind, snow and seismic loads mandated in current building codes and A WW A <br />Standards. That structural analysis is beyond the scope of this evaluation. <br /> <br />FIELD INVESTIGATION <br /> <br />Mr. Michael Reina, P.E. of KTA-Tator, Inc. completed the inspection on <br />November 17,2005. The following tests were performed during the inspection: <br /> <br />A. Visual - Visual assessment of the percentage and distribution of corrosion across <br />the surfaces was made. In addition, other visual observations; such as, peeling, <br />chalking, cracking, blistering, etc. were noted. <br /> <br />B. Coating Thickness - Dry-film thickness was determined using a Positector 6000. <br />The Positector 6000 is a portable, battery operated, digital coating thickness gage <br />that non-destructively measures non-magnetic coating thickness over ferrous <br />substrates using a magnetic principle. Calibration was completed prior to and <br />after use. This test was performed in accordance with ASTM D 1186-93. <br /> <br />C. Number of Coats - The number of coats present and thickness of each were <br />determined using a Tooke Gage Mark IV with a 2X cutting tip. This hand-held <br />portable microscopic (SOX) destructively measures the thickness of each coat in <br />multi-coat systems (up to 50 mils). Observation of a coating cross-section created <br />with a cutting tip of a known angle shows coating thickness in addition to <br />intercoat contamination, voids, underlying rust, mill scale, and pinholes. <br /> <br />D. Adhesion - Adhesion testing was conducted in accordance with ASTM 03359, <br />"Measuring Adhesion by Tape Test." Method A of this standard was utilized. <br />Method A involves scribing an "X" through the coating down to the substrate, <br />followed by the application of pressure sensitive tape (Permacel 99). The tape is <br />then sharply removed from the X-cut and the amount of coating detached is rated <br />in accordance with the ASTM rating scale. Typical ratings of 4-5A are considered <br />by KTA to represent good adhesion, 2-3A represent fair adhesion, while O-IA <br />represent poor adhesion. <br /> <br />E. Ultrasonic Thickness Testing - A Check-Line Model TI-25M Wall Thickness was <br />used to measure the thickness ofthe steel in various representative locations. The <br />gage injects a pulse of high frequency sound (ultrasound) into the steel. Because <br />the speed of sound in a given material is constant, the time that it takes for the <br />sound to travel and be reflected from the far surface can be used to determine its <br />thickness. The instrument provides readings in inches. Verification of gage <br />readings was performed using known steel calibration blocks. <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />15 <br />
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