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These storage tanks operate at 250☏ or less with an operating pressure of up to 15 PSI. API 620 governs the design and construction of large, welded, Advance Tank has extensive experience with API 650 tanks ranging in diameter fromĨ' - 300' for refineries, terminals, pipeline facilities and other clients. It dictates tank design, fabrication, welding, inspection, and erection requirements.ĪPI 650 is widely used for tanks that are designed to internal pressures of 2.5 PSI or less and store products such as crude oil, API 650 is the standard governing welded tanks for oil storage.
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