CoatingsPro Magazine

MAY 2016

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 57 of 84

COATINGSPRO MAY 2016 57 applied Induron Indurethane 6600 Plus at 2 to 3 mils (50.8–76.2 microns) dry flm thickness to the entire exterior of the elevated tank. According to Stelzer, Indurethane 6600 is a high-solids, high-gloss, acrylic polyurethane fnish coat that was chosen because it provides outstanding performance in the severest climates and will retain high gloss and original color for many years. It is also available in a virtually unlimited color range, which was important for the work on the butterfy logo. "Back in 1995, the logo was done freehand using graph paper. Tis time around, since the butterfy was still visible on the tank, the crew traced the design," stated Stelzer. Taking the Work Inside the Tank With all exterior work completed, the crew moved onto the interior of the elevated tank. Using a Schmidt abrasive blast pot, the interior was blasted to NACE No. 2/Society for Protective Coatings (SSPC) Surface Preparation (SP) 10: Near W hite Blast Cleaning. A 12,000 cfm (339.8 m³/min.) dust collector from Eagle Industries was brought into the inside of the tank to contain dust and debris from the blast. Once the interior of the elevated tank was properly prepared, the crew spray applied two coats of Induron PE-70 epoxy. Using a Graco 45:1 spray pump, the Stelzer team applied the PE-70 at 4 to 6 mils (101.6–152.4 microns) dry flm thickness. As stated by Stelzer, PE-70 is a two-component, high-solids, self-priming epoxy coating formulated for superior resistance to water, water-borne chemicals, and other aggres- sive environments. Te coating is also certifed under National Science Foundation (NSF)/American National Standards Institute (ANSI) International 61 for potable water immersion service in tanks of 1,000 gallons (3,785.4 L) or greater capacity and potable water pipe 8 inches (20.3 cm) or greater. Wind and Antennae Dilemma Te city of Papillion's ground and elevated water tanks are located near a major highway, so the foreman on the job had to remain vigilant in checking the wind conditions. If there JOB AT A GLANCE PROJECT: Recoat the ground tank exterior and both the interior and exterior of the elevated potable water tank in Papillion, Neb. COATINGS CONTRACTOR: J.R. Stelzer Co. 5850 Russell Dr. #1 Lincoln, NE 68507 (402) 466-0726 SIZE OF CONTRACTOR: 15 employees SIZE OF CREW: 4 crew members PRIME CLIENT: City of Papillion, Nebraska 122 E 3 rd St. Papillion, NE 68046 (402) 597-2000 SUBSTRATE: Steel and concrete CONDITION OF SUBSTRATE: Good; mild levels of oxidation and loss of mil thickness on elevated tank SIZE OF JOB: ~35,000 sq. ft. (3,251.6 m²) DURATION: ~8 weeks UNUSUAL FACTORS/CHALLENGES: » J.R. Stelzer did the coatings removal and recoat 20 years prior to this recoat project. » High north winds had the potential to cause issues with paint dripping during coating. » Cell phone tower antennae on the elevated tank required coordination for their removal and also special attention to the coax and brackets left behind when the antennae were temporarily removed. MATERIALS/PROCESSES: » Ground Tank Exterior: Pressure washed at 5,000 psi (34.5 MPa); brush and roller applied Induron AC 403 at 4–12 mils (101.6–304.8 microns) dry film thickness (DFT) » Elevated Tank Interior: Abrasive blasted to NACE No. 2/Society for Protective Coatings (SSPC) Surface Preparation (SP) 10 using Schmidt blast pot equipment and applied two coats of Induron PE-70 at 4–6 mils (101.6–152.4 microns) DFT » Elevated Tank Exterior: Pressure washed at 5,000 psi (34.5 MPa); spot primed with Induraguard epoxy using brush and rollers at 3–4 mils (76.2–101.6 microns), applied Induron Indurethane 6600 Plus using brushes and rollers to the entire exterior at 2–3 mils (50.8–76.2 microns) DFT, and applied butterfly logo SAFETY CONSIDERATIONS: » Wore Nova blast hoods during abrasive blasting » Wore 3M half-mask respirators and ear plugs when necessary » Used harnesses, safety lines, and rope grabs when at height To the steel tank's ex terior, they pressure washed, spot primed with Indura guard at 3–4 mil s (76. 2–101.6 microns), applied Indurethane 6600 Plus at 2–3 mils (50.8–76.2 microns), and traced the butter fly logo.

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