API Std 650 self-anchored flat-bottom steel tanks annular ring requirements

Generally, the building area temperature of the API Std 650 self-anchored flat-bottom steel tanks should be considered before the tank design and construction. The temperature in the API Std 650 self-anchored flat-bottom steel tanks building area is closely related to the evaporation loss, energy loss, storage tank materials and the selection of detection instruments, or has a direct impact on the storage cost of the storage liquid. For the same medium, the higher the air temperature and the longer the duration, the higher the material temperature in the API Std 650 self-anchored flat-bottom steel tanks, the higher the corresponding pressure and the more volatile loss.

API Std 650 self-anchored flat-bottom steel tanks basic components are those that contain the vaporized liquefied gas from the stored refrigerated liquid but primarily operate at atmospheric temperatures because of insulation system design and natural ambient heating. These components shall comply with the basic rules of this standard. Examples of such components are the outer wall and roofs of double-wall tanks and roof components above an internally insulated suspended deck. The API 620 tank materials requirements are based on the storage of refrigerated products at the design metal temperature.

Supply covers for API Std 650 self-anchored flat-bottom steel tanks connections specified with the service covers remaining in place following tests. For API 650 tank connections not specified to be supplied with service covers, the test covers may be removed after testing.

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