Each tank is sized with the appropriate normal and emergency vent openings as defined in the tank's standard of construction. Modern is the only manufacturer in the world licensed to build a shop-fabricated UL-142 rectangular tank with a height greater than 103 inches up to 168 inches and infinite length.ĭiked containments can either be open top or closed top construction. If the tank is a double wall configuration, then it has interstitial monitoring capabilities. Rectangular tanks may be of single or double wall construction. For special applications, such as products that have a larger specific gravity than water, Modern offers American Petroleum Institute, API, designed tanks in the API-620 or API-650 design configurations. Tanks are built to Underwriters Laboratories specification standard UL-142. Only new materials are used in tank construction. Special fabrication can incorporate dished tops, dished and coned bottoms all supported on skirts or legs. Tanks generally have flat bottoms and conical roofs. These tanks may also be built with or without multiple compartments for multiple fuel storage. Vertical tanks may be of single or double wall construction. 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. UL-142 tanks are steel atmospheric tanks intended for aboveground storage of non-corrosive, stable, flammable, and combustible liquids.
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