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(5b.) When soluble salt concentrations and conductivity are below the limits <br />set in 5a above, install desiccant dehumidification equipment and <br />abrasive blast clean all interior surfaces including areas above HWL to <br />near-white standard per SSPC SP-10. Dehumidification equipment must <br />remain operational and running from time the near-white blast <br />commences and run 24 hours per day until five days after the final coat <br />of paint is applied. The unit must control the environment to keep the <br />air inside tank and riser at less than 50% relative humidity at all times. <br />Minimum desiccant dehumidification equipment required is an HC- <br />9000 GA desiccant with 50 KW generator as supplied by DH <br />Technologies or equal. <br />(6) Apply NSF approved three coat system of zinc rich primer top coated <br />with two coats of polyamide epoxy to all interior surfaces: <br />Prime coat: Tnemec Series 94 H20 Hydro-Zinc @ 2.5-3.5 mils DFT. <br />Stripe coat: Tnemec Series 20 thinned as much as allowable and brushed <br />into all welds and along all edges. <br />Intermediate and Finish coats: Tnemec Series 20 applied @ 4- 5 mils <br />DFT each coat. <br />Minimum thickness required for the total system is 12 mils DFT. Each <br />succeeding coat of paint will vary from the preceding in color so as to be <br />able to verify coverage. Color of finish coat of paint shall be Tnemec <br />Tank White. <br />(7) Apply Sikaflex or equal NSF approved caulk/ sealer to all interior un- <br />welded seams including rafters and ceiling plates. <br />B. General Provisions for Interior Paint Systems: <br />All sharp edges, weld seams, and other items difficult to coat shall receive a <br />brush applied coat of the intermediate coating thinned as much as possible in <br />accordance with the manufacturer's directions liberally worked in after the <br />prime coat and prior to the finish coat of paint. <br />During and after final application of each coating, all metal surfaces shall be <br />checked with appropriate wet and dry mil gauges to ensure that the required <br />thickness of coating is being obtained. The Contractor shall provide a set of <br />standards with the gauge so that accuracy can be checked. <br />After the paint thickness meets these specifications and has cured for at least <br />five days, the Contractor shall test the entire surface of the paint system for <br />SW-7 <br />~ 438 <br />