Erection requirements for API 650 welded tanks for oil storage

API 650 Tanks in which liquid fluids are stored and designed to withstand atmospheric pressure operation, less than 18 kPa, or internal pressures not exceeding the weight of the API 650 welded tanks for oil storage roof, with temperatures no higher than 93, 3 C are included in the scope of this design code.

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API 620 crude oil tank piping materials made according to ASTM A333 and A350 may be used at API 650 welded tanks for oil storage design metal temperatures no lower than the impact test temperature required by the ASTM specification for the applicable material grade without additional impact tests. For temperatures below those allowed by the ASTM specification, the following paragraph shall apply.