Tanks generally have flat bottoms and conical roofs. These tanks may also be built with or without multiple compartments for multiple fuel storage. If the tank is a double wall configuration, then it has interstitial monitoring capabilities. Vertical tanks may be of single or double wall construction. Tanks are built to Underwriters Laboratories specification standard UL-142. Tanks may also be built with or without multiple compartments for multiple fuel storage. Horizontal tanks may be single or double wall construction. Only new steel materials are used in tank constructions.Įach tank is sized with the appropriate normal and emergency vent openings as defined in the tank's standard of construction. Tanks can be furnished with stationary support saddles, anti roll supports or structural skids. Maximum allowable working pressure is 0.5 psig as measured from top of tank. If you cannot find a particular chart now, please check back periodically since we plan to update this collection as additional charts become available.Ġ.375' = 3/8' 0.500' = 1/2' 0.625' = 5/8' 0.750' = 3/4' 0.UL-142 tanks are steel atmospheric tanks intended for aboveground storage of non-corrosive, stable, flammable, and combustible liquids. In providing this information, Unidocs is not endorsing the use of any particular manufacturer's equipment. Since original tank charts can be difficult to find, Unidocs has provided the following charts as a service to UST owners / operators and UST Service Technicians. If you cannot find an original chart, Modern Welding has a tank chart generator for steel tanks available here. Click here for Containment Solutions tanks.Some tank manufacturers have calibration charts available on their websites: When performing an underground storage tank (UST) overfill prevention equipment inspection, it is very important to use the correct tank calibration chart to determine whether or not the equipment is activating at the correct level.

Modern welding 7000 gallon tank