Welding tank exteriors

System 3. A premium factory-applied exterior coating system combines the longterm corrosion protection of the inorganic zinc primer with a polyamide epoxy intermediate coat and an acrylic urethane topcoat. The ultimate in welded tank exterior systems. System 3 provides off shore protection and extended color and oss retention. This coating system is further enhanced by factory baking at 200 F (93°C). 

Information on typical welded tank interior and exterior coatings follows. 

The most complete set of overpressure measurements was obtained by Enger and Hartman in the Shell Pipeline study. The data were collected using a spill tank 1.5 m deep and 2.1 m in diameter. The tank was made of 6.3-mm mild steel plate with 12-mm-diameter circumferential reinforcing rods spot-welded to the exterior. The capacity was 5.3 m, but during the tests the water depth was held constant at 1 m (3.8 m ). The LNG was contained in a 0.13-m Dewar made from 6.3-mm mild steel with a stainless steel inner liner. The annulus was evacuated. When spilling, the Dewar lip was about 0.75 m above the water surface. 

Welded silos are available in aluminum, stainless steel, and mild steel construction and are fabricated at the manufacturer s plant. The shell, deck, and hopper sections are all welded together into one structure and, on the mild steel tanks, both interior epoxy coating and exterior finish are applied before shipment. The epoxy coating provides a smooth corrosion- and abrasion-resistant lining for the tank interior surfaces which come in contact with the resin. Brackets are welded to the tank prior to finishing to allow attachment of various accessory items such as ladders, guardrails, fill lines, etc. 

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