Clark Welding Tanks is an American manufacturer of above ground storage tanks, custom steel fabrication, and welding repair services serving commercial, industrial, agricultural, municipal, construction, mining, and fuel distribution customers. Since 1991, we have manufactured UL 142 above ground storage tanks, vertical storage tanks, double wall tanks, self-contained tanks, waste oil tanks, water storage tanks, water truck tanks, generator fuel tanks, custom steel tanks, garbage dumpsters, and ...