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API 650 - Welded Steel Tanks for Oil Storage

API 650 standard covers adequate safety and reasonable economy for tanks used in the storage of petroleum, petroleum products and other liquid products. It establishes minimum requirements for material, design, fabrication, erection, and testing for vertical, cylindrical, aboveground, closed- and open-top welded storage tanks for internal pressures approximating atmospheric pressure. A higher internal pressure is permitted when additional requirements are met. This Standard applies only to tanks whose entire bottom is uniformly supported and to tanks in non-refrigerated service that have a maximum design temperature of 93°C (200°F).

This standard is not based on set tank sizes, nor does it cover storage tanks that are being erected in areas subject to more stringent regulations than what are included in this standard. API 650 is intended to help purchasers and manufacturers in ordering, fabricating and erecting tanks based on whatever size tank may best meet their needs. It is not intended to prohibit purchasing or fabricating tanks that meet specifications other than those contained in this standard.

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