AMPP CCAS case studies
AMPP CCAS · Put your knowledge to work in context.
CCAS - the Certified Coating Applicator Specialist credential - is an AMPP certification aimed at the people who actually put protective coatings on steel and concrete: applicators, blasters, spray hands, crew leads, and the supervisors who direct them. AMPP describes itself as the largest global community for corrosion and coatings expertise, and its education catalog covers cathodic protection, coating inspection, protective coatings, and corrosion prevention. The AMPP CCAS case studies are 5 cases and about 3,890 words.
1Chloride Contamination on a Salt-Exposed Girder: Average Results vs. Failing Locations
A 40-year-old steel girder carries a road over a tidal estuary and receives de-icing runoff. The specification requires abrasive blast to Sa 2½, a 50–85 µm profile, chloride below 5 µg/cm², and coating within 4 hours of blasting.
753 words, about 4 min2Exceeded Recoat Window on a Shop-Primed Tank Interior
The interior of a 3,000 m³ carbon steel tank is being lined. The shop-applied primer is a 100 % solids amine-cured epoxy at 150 µm DFT, applied 16 days ago and transported to site.
798 words, about 4 min3Narrow Fan and Low Film Thickness During Airless Spraying of High-Solids Epoxy
An applicator is spraying an 85 % volume-solids epoxy at 250–350 µm DFT per coat onto a large exterior steel structure. Equipment: 45:1 airless pump, 30 m of 9.5 mm hose, 0.017 in (0.43 mm) tip, fluid pressure at the pump 160 bar.
785 words, about 4 min4Blistering in a Glass-Flake Lining Six Months After Commissioning
Six months after commissioning, a 500 m³ carbon steel tank lined with 400 µm nominal glass-flake epoxy in 60 °C brine shows blistering: 3–8 mm domes, 20–40 per m², concentrated in a 200–400 mm band above the bottom seam and around a nozzle. Original QC: DFT 380–450 µm by magnetic gauge over a 75 µm blast profile; holiday test at 5 kV found nothing; pull-off adhesion 6 MPa.
780 words, about 4 min5Lead-Containing Abrasive Blasting in a Confined Tank
An enclosed 200 m³ steel tank is being abrasive-blasted and coated. The old coating registers 8 % lead by XRF.
774 words, about 4 min