welded tank plastic storage grain silos WELDED TANK In addition to our standard welded tank products, ColumbianTecTank manufactures a variety of storage application. Welded tanks or silos can be installed quickly. No company in the industry can compete with our track record for excellence in planning, construction and maintaining superior bolted tank and welded tank storage systems. As the tank was in poor condition and required replacement it was decided to use a welded tank with dummy rivet heads for authenticity in appearance. The tank is a welded tank, the true vapor pressure of the contained liquid. A bolted tank typically costs less to build than a welded tank of the same capacity, for smaller tanks of up to about 200,000 gallons. For the larger ground tanks, the initial cost is typically higher for the bolted tanks. The process involves filling the completely welded tank with a solution and then applying an electrostatic charge. The interior panel edge re-coating is expected to last longer than the interior painting cycles of a conventional welded tank. I based the filter system construction on the commercial filter bay type, mainly because of my very limited space , this included four two feet dia by two feet six deep circular plastic water tanks joined together by four inch solvent welded tank connectors inch and a half bottom outlets flushable to waste via gate valves on each tank .