PKG designed and fabricated (2) 6200 gallon acid storage tanks from carbon steel in accordance with the latest edition of ASME Boiler and Pressure Vessel Code Sec. VIII, Div. 1 for unfired pressure vessels. The maximum allowable pressure for both tanks was 40 PSI at 100º F. The tanks were 84″ Ø x 237″ straight side. All circumferential and longitudinal shell welds were complete penetration butt welds. The tank interiors were grit blasted to white metal per SSPC-SP5. Each tank had a 24″ Ø manway, (6) 150# flanged fittings, lifting lugs and saddle re-pads for existing saddles. The exterior of both tanks was grit blasted to SSPC-SP6. Each tank exterior was coated with a base coat of Amercoat Multi Purpose High Build Epoxy with a top coat of Amercoat Gloss Aliphatic Resin Polyurethane in gloss white.
The first tank was for storing 31% to 37% hydrochloric acid. The tank interior was lined with 3/16″ thick pure gum natural rubber. Seams were overlaid with 2″ wide cap strips. The liner was carried through the full face of all nozzles and the manway and was included on the attached manway cover. A spark test was performed after liner installation.
The second tank was for storing 67% to 98% sulfuric acid. That tank′s interior was coated with Enecon Chemclad XC, 100% solids, high performance chemical resistant coating. Three coats were applied in alternating colors of dark and light gray. The coating was carried through the full face of all nozzles and the manway including the manway cover. A 5000 to 7000 volts spark test was performed.
Once the tanks were completed, each tank was inspected by a quality assurance inspector authorized by The National Board of Boiler and Pressure Vessel Inspectors, received a U-stamp and was registered with The National Board of Boiler and Pressure Vessel Inspectors. After the tanks were installed at the customer′s facility, a metal fabricator from PKG Equipment spark tested the tanks prior to being filled.