The foundations for API Std 650 petroleum storage tanks

API Std 650 petroleum storage tanks Pressure-relieving DevicesTanks shall be protected by automatic pressure-relieving devices that will prevent the pressure at the top of the tank from rising more than 10% above the maximum positive gauge pressure except as provided in API 620 standard 9.2.2.Where an additional hazard can be created by the exposure of the tank to accidental fire or another unexpected source of heat external to the tank, supplemental pressure-relieving devices shall be installed. These devices shall be capable of preventing the pressure from rising more than 20% above the maximum positive gauge pressure. A single pressure-relieving valve may be used if it satisfies the requirements of this paragraph and 9.2.1.

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When API 650 storage tank is designed, when the design pressure is small F2 kPa, the impact of air pressure on the API Std 650 petroleum storage tanks tank wall thickness is not considered in the tank wall design.