Sierra Sales designs, engineers and supplies plastic safe poly processing tanks, polyethylene chemical storage tanks. Plastic tanks for corrosives, safe poly processing tanks, vertical, cone bottom, open top, horizontal, safe-tanks, double wall tanks, full drain tanks, IBC, SUMO, fittings & accessories. Plastic tanks for sodium hypochlorite, sulfuric acid, caustic, hydrochloric acid, and secondary containment are our specialty. Lined steel products & accessories are available in any number of fluoroplastics. Our vessels are independently designed for each project and to the requirements required by th engineer.