The provisions herein supplement API Standard 620 and form a guide for materials@ design@ and fabrication of tanks to be used for storage of refrigerated products. A refrigerated tank may be a single-wall insulated tank or a double-wall tank consisting of an inner tank for storing the refrigerated liquid and an outer tank enclosing an insulation space (usually having a lower gas pressure) around the inner tank. A double-wall tank is a composite tank and the outer tank is not required to contain the product of the inner tank. In a double-wall tank@ differences in materials@ design@ and testing exist between the inner and outer tanks.
API STD 620 SUPP-1965 history
1968API STD 620 SUPP-1968 Recommended Rules for Design and Construction of Large@ Welded@ Low-pressure Storage Tanks
1965API STD 620 SUPP-1965 RECOMMENDED RULES FOR DESIGN AND CONSTRUCTION OF LARGE@ WELDED@ LOW-PRESSURE STORAGE TANKS - SUPPLEMENT (Second Edition)